BEGIN:VCALENDAR
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BEGIN:VEVENT
SUMMARY:Zohar Komargodski
DTSTART:20200805T140000Z
DTEND:20200805T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/1
DESCRIPTION:Title: Generalized Symmetries\, Confinement\, and Naturalness\n
by Zohar Komargodski as part of CERN Theory Colloquia\n\n\nAbstract\nWe ex
plore various generalizations of the notion of symmetry and Noether’s th
eorem. We show how some new results about phases of gauge theories can be
derived from thinking about symmetries more carefully and abstractly. We p
rovide some examples in 2\,3\, and 4 dimensions. \nWe also make some comme
nts on the notion of naturalness and show how in some two-dimensional theo
ries it is violated.\n\nZoom connection info:\n\nhttps://cern.zoom.us/j/99
878164685?pwd=VkNWZ3phQ1ZtTkFHSkh4Z3Npd3NmZz09\n\nMeeting ID: 998 7816 468
5\n\nPassword: 794683\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergei Dubovsky
DTSTART:20200812T120000Z
DTEND:20200812T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/2
DESCRIPTION:Title: Integrability from confinement\nby Sergei Dubovsky as pa
rt of CERN Theory Colloquia\n\n\nAbstract\nIntegrable models have prominen
tly emerged in the past studies of perturbative QCD. I will argue that (ap
proximate) integrability\nis a natural consequence of confinement and asym
ptotic freedom. I will illustrate this reasoning by two examples. First\,
I will show\nhow it leads to the ansatz for glueball quantum numbers in (2
+1)-dimensional Yang-Mills theory. Recent lattice data\nconfirmed many pre
dictions of this ansatz. Second\, I will show how this logic allowed us to
lead to identify a remarkably simple and novel integrable relativistic N-
body system\, which describes the high energy worldsheet dynamics in 2-dim
ensional adjoint QCD.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vera Guelpers
DTSTART:20200902T120000Z
DTEND:20200902T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/3
DESCRIPTION:Title: Lattice calculations for high-precision tests of the Standar
d Model of Particle Physics\nby Vera Guelpers as part of CERN Theory C
olloquia\n\n\nAbstract\nThe LHC has not yet found any significant deviatio
n from the Standard Model at large energies and thus\, indirect high-preci
sion searches for signatures of physics beyond the Standard Model at low e
nergies become more and more important. For any quantity involving the str
ong nuclear force\, the only known approach for an ab-initio treatment at
low energies is Lattice QCD. In this talk I will give some examples for qu
antities that can be used to test the Standard Model and will mainly focus
on the inclusion of electromagnetic and strong isospin breaking correctio
ns\, which are required to further increase the precision of such lattice
calculations.\n\nZoom connection info:\nhttps://cern.zoom.us/j/97792556765
?pwd=TVRXTkpQKytibGN4RkxKYzJKUHhWZz09\nMeeting ID: 977 9255 6765\nPassword
: 131506\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luciano Rezzolla
DTSTART:20201007T120000Z
DTEND:20201007T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/4
DESCRIPTION:Title: The first image of a black hole\nby Luciano Rezzolla as
part of CERN Theory Colloquia\n\n\nAbstract\nI will briefly discuss how th
e first image of a black hole was obtained by the EHT collaboration. In pa
rticular\, I will describe the theoretical aspects that have allowed us to
model the dynamics of the plasma accreting onto the black hole and how su
ch dynamics was used to generate synthetic black-hole images. I will also
illustrate how the comparison between the theoretical images and the obser
vations has allowed us to deduce the presence of a black hole in M87 and t
o extract information about its properties. Finally\, I will describe the
lessons we have learned about strong-field gravity and alternatives to bla
ck holes.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Volker Springel
DTSTART:20201021T120000Z
DTEND:20201021T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/5
DESCRIPTION:Title: Supercomputer insights into the messy physics of galaxy form
ation\nby Volker Springel as part of CERN Theory Colloquia\n\n\nAbstra
ct\nSimulations of cosmic structure formation have come a long way. Nowada
ys\, they are not only accurately predicting the dark matter backbone of t
he cosmic web and the internal structure of halos and their satellites far
into the non-linear regime\, but are also capable of following the baryon
ic sector with rapidly improving physical fidelity. In my talk\, I will re
view the methodology and selected successes of recent hydrodynamical galax
y formation simulations\, and critically discuss some of the primary uncer
tainties in modelling strong\, scale-dependent feedback processes. I will
also highlight predictions for the structure of magnetic fields in galaxie
s and the importance of cosmic rays in galaxy evolution. Finally\, I discu
ss some of the challenges lying ahead in this field in the coming years.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francesca Calore
DTSTART:20201028T130000Z
DTEND:20201028T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/6
DESCRIPTION:Title: Probing axion-like particles with high-energy astrophysics\nby Francesca Calore as part of CERN Theory Colloquia\n\n\nAbstract\nAx
ion-like particles (ALPs) are hypothetical pseudo Nambu Goldstone bosons p
redicted in numerous extensions of the standard model for Particle Physics
\, and they can represent viable dark matter candidates. Axions and ALPs c
ould be detected through the coupling to photons\, which would induce conv
ersion of ALPs into photons and back when travelling through external magn
etic fields. In my presentation\, I will illustrate how we can leverage on
high-energy astrophysics observations of Galactic and extragalactic sourc
es to look for specific imprints of the ALPs-photon coupling over a broad
range of wavelengths\, from radio to high-energy gamma rays. I will review
current constraints on the ALPs parameter space\, and provide an outlook
on future experiments' sensitivity to ALPs discovery.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simon Caron-Huot
DTSTART:20201111T130000Z
DTEND:20201111T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/7
DESCRIPTION:Title: Gravity: The force from the UV\nby Simon Caron-Huot as p
art of CERN Theory Colloquia\n\n\nAbstract\nDispersion relations are state
ments of causality. They give sum rules connecting infrared and ultraviole
t physics. While they originate in optics and quantum field theory\, I wi
ll argue that their true purpose is gravity\, due to the maximal growth ra
te of this force with energy. I will briefly discuss ongoing work on the
space of consistent low-energy effective theories\, with preliminary resul
ts in scalar models showing that causality turns dimensional analysis esti
mates into sharp numerical bounds.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pedro Machado
DTSTART:20201118T130000Z
DTEND:20201118T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/8
DESCRIPTION:Title: The Large Neutrino Collider\nby Pedro Machado as part of
CERN Theory Colloquia\n\n\nAbstract\nIn this colloquium\, I will discuss
aspects that I am excited about of liquid argon time projection chambers (
LArTPCs). I will put emphasis particularly on the topological capabilities
of LArTPCs. I will not discuss the main physics program of DUNE and the S
hort Baseline Neutrino program at Fermilab. Instead\, I will highlight nov
el signatures and search strategies that have been recently proposed in th
ese experiments and brush through several physics scenarios that can be pr
obed in these facilities.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Irene Tamborra
DTSTART:20201202T130000Z
DTEND:20201202T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/9
DESCRIPTION:Title: Ghostly Messengers of the Cosmos\nby Irene Tamborra as p
art of CERN Theory Colloquia\n\n\nAbstract\nNeutrinos are fascinating elem
entary particles heralding the dawn of the multi-messenger astronomy era.
Neutrinos affect the stellar dynamics\, drive the formation of new element
s\, and carry signatures of the yet mysterious physics ruling the most pow
erful cosmic fireworks. Recent developments on the role of neutrinos in co
smic sources will be reviewed together with the most exciting detection pr
ospects.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Edward Shuryak
DTSTART:20201216T130000Z
DTEND:20201216T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/10
DESCRIPTION:Title: Instantons and sphalerons of electroweak theory and QCD
\nby Edward Shuryak as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jeffrey Hazboun
DTSTART:20210127T130000Z
DTEND:20210127T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/11
DESCRIPTION:Title: Searching for Nanohertz Gravitational Waves with a Galactic
-Scale Detector\nby Jeffrey Hazboun as part of CERN Theory Colloquia\n
\n\nAbstract\nPulsar timing arrays open a new band of the gravitational wa
ve spectrum by building a galactic-scale GW detector. They will detect a s
tochastic background of gravitational waves in the next few years. The str
ongest signal is expected to be the unresolvable background from supermass
ive black hole binaries at the centers of merged galaxies. While SMBBHs ar
e expected to be the strongest source of GWs we are sensitive to any GW si
gnal in the nanohertz regime. The North American Nanohertz Observatory for
Gravitational Waves (NANOGrav) is an NSF funded Physics Frontiers Center
monitoring over 70 millisecond pulsars for the signature of these gravitat
ional waves. In the NANOGrav 12.5-year dataset we are seeing significant e
vidence for a signal in our data that is common among many of the pulsars.
We currently find no definitive evidence for the correlated pattern that
is indicative of gravitational waves\, however\, if we are seeing the firs
t signs of the GW background our models show that continued observations w
ill lead to a detection within the next few years.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ian Moult (SLAC\, Stanford)
DTSTART:20210303T150000Z
DTEND:20210303T170000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/12
DESCRIPTION:Title: Rethinking Jets: From the LHC\, to Conformal Colliders\, an
d Back Again\nby Ian Moult (SLAC\, Stanford) as part of CERN Theory Co
lloquia\n\n\nAbstract\nJets\, and more recently jet substructure\, have be
en studied since the early days of QCD using observables that measure the
shape of radiation produced in collisions. In this talk I will reformulate
jet substructure as the study of the near-coincidence (or operator produc
t expansion (OPE)) limit of certain non-local lightray operators. This for
mulation allows us to build a direct bridge between QCD phenomenology and
recently developed techniques in conformal field theory. In particular\, I
will show that the OPE of lightray operators provides a natural expansion
for jet substructure\, and predicts rich Lorentzian scaling behavior insi
de jets at the LHC\, which surprisingly has not been studied by the QCD co
mmunity. Using Open Data from the CMS experiment\, I will show that the sc
aling and shape dependence of matrix elements of multiple lightray operato
rs can be directly measured at the LHC\, and exhibit a number of remarkabl
e properties. I will then describe how connections between conformal field
theory and jet substructure provide new insights into complicated calcula
tions in jet substructure\, and new avenues for better understanding QCD.\
n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pilar Coloma
DTSTART:20210317T130000Z
DTEND:20210317T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/13
DESCRIPTION:Title: New physics searches using neutrino oscillation experiments
\nby Pilar Coloma as part of CERN Theory Colloquia\n\n\nAbstract\nIn t
his talk\, I will first give a broad introduction to neutrino oscillations
\, including the current experimental status of the field as well as the m
ain future proposals to measure neutrino properties precisely. I will then
discuss the possibilities to search for new physics using neutrino facili
ties\, paying particular attention to the complementarity between oscillat
ion and non-oscillation experiments.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hai-Bo Yu
DTSTART:20210407T120000Z
DTEND:20210407T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/14
DESCRIPTION:Title: Self-Interacting Dark Matter\nby Hai-Bo Yu as part of C
ERN Theory Colloquia\n\n\nAbstract\nIn this talk\, I will give an overview
on dark matter distributions in galactic systems\, including spiral galax
ies in the field\, Milky Way satellite galaxies\, newly-discovered ultra d
iffuse galaxies\, and galaxy clusters\, and show that they are more divers
e than predicted in the standard cold dark matter theory. Then I will show
that self-interacting dark matter may provide a unified explanation to th
e observed diversity over a wide range of galactic mass scales. I will fur
ther discuss other astrophysical implications of self-interacting dark mat
ter\, such as the origin of supermassive black holes in the early Universe
.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giovanni Villadoro
DTSTART:20210414T120000Z
DTEND:20210414T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/15
DESCRIPTION:Title: Axion Dark Matter\nby Giovanni Villadoro as part of CER
N Theory Colloquia\n\n\nAbstract\nBesides providing a simple dynamical exp
lanation to the strong CP problem the QCD axion is also one of the most co
mpelling dark matter candidate. While the presence of relic axions is almo
st guaranteed if such particle exists\, a reliable computation of its abun
dance is still missing. Such information could be pivotal in both focusing
the experimental efforts and drawing the right theoretical conclusions in
case of a discovery. In this talk I will review the challenges of such co
mputation and the most recent developments.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andreas Juettner
DTSTART:20210421T120000Z
DTEND:20210421T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/16
DESCRIPTION:Title: Towards a holographic description of cosmology on the latti
ce\nby Andreas Juettner as part of CERN Theory Colloquia\n\n\nAbstract
\nFollowing a recent proposal based on holography the physics of the very
early universe can be described in terms of a three-dimensional quantum fi
eld theory without gravity. In this model cosmological observables are exp
ressed in terms of correlation functions of the energy-momentum tensor com
puted in the QFT. Testing the model against observational data\, e.g. from
Planck\, requires control over the non-perturbative dynamics in the QFT\,
which we address with numerical simulations on the lattice. In this talk
I will discuss our progress towards making predictions for the properties
of the CMB from our model\, which requires understanding the IR properties
of 3d super-renormalisable QFT and the computation of 2pt functions of th
e energy-momentum tensor on the lattice.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Clifford Cheung
DTSTART:20210428T143000Z
DTEND:20210428T163000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/17
DESCRIPTION:Title: From Scattering to the Dynamics of Black Holes and Fluids\nby Clifford Cheung as part of CERN Theory Colloquia\n\n\nAbstract\nThe
S-matrix bootstrap is a systematic framework for deriving dynamics withou
t reference to an action or an underlying spacetime. Remarkably\, the exp
ressions gleaned from this line of attack are marvelously simple\, reveali
ng new structures long hidden in plain sight. As examples\, I describe th
e duality between color and kinematics and how gravity serves as the "moth
er of all theories" whose S-matrix secretly encodes and unifies those of g
luons\, pions\, and Galileons. I then describe recent progress applying t
hese ideas to subjects somewhat less well-tread by particle physicists: gr
avitational wave physics and fluid dynamics. First\, I discuss how cuttin
g edge ideas from amplitudes have been fused with classic tools from effec
tive field theory to derive state-of-the-art results on the orbital dynami
cs of binary black holes and neutron stars. Second\, I show how the Navie
r-Stokes equation encodes scattering amplitudes of fluid quanta which are
also amenable to amplitudes analysis and exhibit a litany of familiar stru
ctures\, including soft theorems\, recursion\, and the double copy.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christine Muschik
DTSTART:20210512T120000Z
DTEND:20210512T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/18
DESCRIPTION:Title: SU(2) hadrons on a quantum computer\nby Christine Musch
ik as part of CERN Theory Colloquia\n\n\nAbstract\nWe realize\, for the fi
rst time\, a non-Abelian gauge theory with both gauge and matter fields on
a quantum computer. This enables the observation of hadrons and the calcu
lation of their associated masses. The SU(2) gauge group considered here r
epresents an important first step towards ultimately studying quantum chro
modynamics\, the theory that describes the properties of protons\, neutron
s and other hadrons. Quantum computers are able to create important new op
portunities for ongoing essential research on gauge theories by providing
simulations that are unattainable on classical computers. Our calculations
on an IBM superconducting platform utilize a variational quantum eigensol
ver to study both meson and baryon states\, hadrons which have never been
seen in a non-Abelian simulation on a quantum computer. We develop a resou
rce-efficient approach that not only allows the implementation of a full S
U(2) gauge theory on present-day quantum hardware\, but further lays out t
he premises for future quantum simulations that will address currently una
nswered questions in particle and nuclear physics.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Laurent Lellouch
DTSTART:20210519T120000Z
DTEND:20210519T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/19
DESCRIPTION:Title: Leading hadronic contribution to the muon magnetic moment f
rom lattice QCD\nby Laurent Lellouch as part of CERN Theory Colloquia\
n\n\nAbstract\nTwenty years ago in an experiment at Brookhaven National La
boratory\, physicists measured the muon's anomalous magnetic moment\, 𝑎
𝜇=(𝑔𝜇−2)/2\, with a remarkable precision of 0.54 parts per mill
ion. Since then\, the standard model prediction for 𝑎𝜇 has exhibited
a discrepancy with experiment of over 3 standard deviations\, raising the
tantalizing possibility of physical particles or forces as yet undiscover
ed. On April 7 a new experiment at Fermilab presented its first results\,
brilliantly confirming Brookhaven's measurement and bringing the discrepan
cy with the standard model to a near discovery level of 4.2 sigma. To full
y leverage this and future measurements\, and possibly claim the presence
of new fundamental physics\, it is imperative to check the standard model
prediction with independent methods\, and to reduce its uncertainties. Aft
er an introduction and a discussion of the current experimental and theore
tical status of 𝑎𝜇\, I will present a precise lattice QCD calculatio
n\, by the BMW collaboration\, of the contribution to this quantity that m
ost limits the precision of the standard model prediction. The result of
this calculation significantly reduces the gap between the standard model
and experiment\, and suggests that new physics may not be needed to explai
n the current\, experimental\, world-average value of 𝑎𝜇.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gian Giudice
DTSTART:20210609T120000Z
DTEND:20210609T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/20
DESCRIPTION:Title: Self-Organised Localisation\nby Gian Giudice as part of
CERN Theory Colloquia\n\n\nAbstract\nWe describe a new phenomenon in quan
tum cosmology: self-organised localisation. When the fundamental parameter
s of a theory are functions of a scalar field subject to large fluctuation
s during inflation\, quantum phase transitions can act as dynamical attrac
tors. As a result\, the theory parameters are probabilistically localised
around the critical value and the Universe finds itself at the edge of a p
hase transition. We illustrate how self-organised localisation could accou
nt for the observed near-criticality of the Higgs self-coupling\, the natu
ralness of the Higgs mass\, or the smallness of the cosmological constant.
\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ian Shipsey
DTSTART:20210630T120000Z
DTEND:20210630T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/21
DESCRIPTION:Title: quantum sensing\nby Ian Shipsey as part of CERN Theory
Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joachim Kopp
DTSTART:20210706T120000Z
DTEND:20210706T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/22
DESCRIPTION:Title: Neutrinos as a Window to New Physics\nby Joachim Kopp a
s part of CERN Theory Colloquia\n\n\nAbstract\nWe discuss some of the mani
fold ways in which physics beyond the Standard Model (SM) can manifest its
elf in the neutrino sector. We begin with the dimension-4 "neutrino portal
" which leads to mixing between SM neutrino and any new singlet fermion. I
n this context\, we highlight recent insights into the observed neutrino o
scillation anomalies\, both within the SM and beyond. At dimension-5\, we
introduce neutrino magnetic moments as a discovery tool for TeV-scale new
physics\, and we discuss the various terrestrial\, astrophysical\, and cos
mological constraints on such operators. Finally\, we consider dimension-6
operators involving neutrinos in the context of Standard Model Effective
Theory (SMEFT) and its lower-energy counterparts. We demonstrate that expe
riments observing LHC neutrinos\, such as FASERν and SND@LHC\, will becom
e interesting players in the future.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Valerie Domcke
DTSTART:20210707T120000Z
DTEND:20210707T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/23
DESCRIPTION:Title: Cosmology with Axion-Like Particles\nby Valerie Domcke
as part of CERN Theory Colloquia\n\n\nAbstract\nAxion-like particles may p
lay a key role in early universe cosmology. They are naturally equipped wi
th the right properties to explain cosmic inflation\, can dynamically expl
ain the smallness of the electroweak scale\, may be involved in the genera
tion of the matter antimatter asymmetry and are promising dark matter cand
idates. In this talk I discuss a generic but previously overlooked particl
e particle production mechanism\, resulting in the dual production of gaug
e fields and fermions induced by axion-like particles. I will discuss how
this crucially impacts all of the cosmological scenarios mentioned above a
nd may be probed with upcoming gravitational wave detectors.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jennifer Schober
DTSTART:20210728T120000Z
DTEND:20210728T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/24
DESCRIPTION:Title: Cosmic magnetic fields: a new window to the early Universe<
/a>\nby Jennifer Schober as part of CERN Theory Colloquia\n\n\nAbstract\nM
agnetic fields are observed on virtually all length scales of the modern U
niverse\, from planets and stars to galaxies and galaxy clusters. Observat
ions of blazars suggest that even the intergalactic medium is permeated by
magnetic fields. Such large-scale fields were most likely generated very
shortly after the Big Bang and therefore are a unique window into the phys
ics of the very early Universe.\nIn my talk\, I will review theoretical mo
dels of magnetogenesis and confront these with observational constraints.
I will address the possible origin of magnetic fields in the very early Un
iverse\, during inflation and the cosmological phase transitions\, as well
as their pre-recombination evolution in magnetohydrodynamical (MHD) turbu
lence. In particular\, I will present new results from high-resolution num
erical simulations that show an efficient amplification of magnetic energy
due to the so-called chiral anomaly\, a standard model effect that necess
arily leads to an extension of the MHD equations at high energies.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marko Simonovic
DTSTART:20210929T120000Z
DTEND:20210929T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/25
DESCRIPTION:Title: Towards precision cosmology from large-scale structure of t
he universe\nby Marko Simonovic as part of CERN Theory Colloquia\n\n\n
Abstract\nThe last decade has seen a tremendous improvement in theoretical
understanding of galaxy clustering on cosmological scales\, which culmina
ted in recent CMB-independent measurement of cosmological parameters from
spectroscopic galaxy surveys. In this talk I will review the main conceptu
al and practical developments which led to this progress. I will also high
light the main lessons we learned so far and discuss further improvements
that have to be made in order to optimally extract information from the on
going galaxy surveys such as DESI and Euclid. I will conclude by arguing t
hat in the next couple of years the large-scale structure will become as p
owerful probe of cosmology as the CMB\, and show the immense potential tha
t the combination of the two has in answering some of the open questions i
n cosmology.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mauricio Bustamante
DTSTART:20211013T120000Z
DTEND:20211013T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/26
DESCRIPTION:Title: Pushing high-energy neutrino physics to the cosmic frontier
\nby Mauricio Bustamante as part of CERN Theory Colloquia\n\n\nAbstrac
t\nHigh-energy (TeV-PeV) and ultra-high-energy (> 100 PeV) neutrinos of co
smic origin have a vast potential to probe neutrino physics in regimes of
energy and distance otherwise unreachable. Notable examples include precis
ion tests using the flavor composition of the neutrino flux\, new neutrino
-neutrino interactions\, and measuring the neutrino-nucleon cross section.
Today\, we are already tapping into this potential at high energies\, tha
nks to spectacular discoveries by the IceCube neutrino telescope. In the
coming decade\, we may extend our reach to ultra-high energies\, thanks to
an ambitious experimental program under planning. I will survey the rich
landscape of high-energy physics with cosmic neutrinos\, from the perspec
tives of theory and experiment. By means of illustration\, I will campaig
n for the notion that in order for the field to mature\, we must embrace t
he natural synergy between low-energy and high-energy neutrino experiments
\, and adopt an earnest\, comprehensive treatment of the relevant particle
-physics and astrophysical unknowns. If we do\, then our progress\, while
hard-earned\, could lead to transformative insight.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rebecca Leane
DTSTART:20211027T140000Z
DTEND:20211027T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/27
DESCRIPTION:Title: Detecting Dark Matter in Celestial Bodies\nby Rebecca L
eane as part of CERN Theory Colloquia\n\n\nAbstract\nStars and planets can
be ideal playgrounds to discover dark matter. In this talk\, I will revie
w a range of dark matter searches using celestial objects\, including neut
ron stars\, exoplanets\, solar-system planets\, and our Sun. I will discus
s different search strategies\, their opportunities and limitations\, and
the interplay of regimes where different celestial objects are optimal det
ectors.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dorota Maria Grabowska
DTSTART:20211117T130000Z
DTEND:20211117T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/28
DESCRIPTION:Title: Applying Quantum Technology to Problems in Particle Physics
\nby Dorota Maria Grabowska as part of CERN Theory Colloquia\n\nAbstra
ct: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Julia Harz
DTSTART:20211124T130000Z
DTEND:20211124T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/29
DESCRIPTION:Title: Probing the properties of neutrinos and the mechanism behin
d the baryon asymmetry\nby Julia Harz as part of CERN Theory Colloquia
\n\n\nAbstract\nWith neutrino oscillations pointing us towards massive neu
trinos\, they are a clear hint towards physics beyond the standard model.
With a bright and diverse landscape of current and future experiments\, no
vel approaches are being developed to probe the nature and interactions of
neutrinos. First\, I will talk about possible dim-5 interactions\, in par
ticular transition magnetic moments\, and will discuss the sensitivity of
coherent elastic neutrino-nucleus scattering experiments to probe those. I
n this context\, I will present a new smoking gun signature that can probe
sterile neutrinos in an unexplored parameter space and can be used to dis
tinguish between a Dirac or Majorana nature. I will then continue with pos
sible dim-7 and dim-9 lepton-number violating interactions. I will discuss
the interesting interplay between different observables such as meson dec
ays\, neutrinoless double beta decay and LHC searches. Finally\, I will de
monstrate the far-reaching implications of such an observation for cosmolo
gy: the potential to render standard thermal leptogenesis unviable.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Riccardo Rattazzi
DTSTART:20211201T130000Z
DTEND:20211201T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/30
DESCRIPTION:Title: The quantum mechanics of a perfect fluid\nby Riccardo R
attazzi as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Csaba Csaki
DTSTART:20211208T140000Z
DTEND:20211208T153000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/31
DESCRIPTION:Title: Magnetic scattering: pairwise little group and pairwise hel
icity\nby Csaba Csaki as part of CERN Theory Colloquia\n\n\nAbstract\n
I discuss how to construct a Lorentz-invariant S-matrix for the scattering
of electrically and magnetically charged particles. A key ingredient is a
revision of our fundamental understanding of multi-particle representatio
ns of the Poincaré group. Surprisingly\, the asymptotic states for electr
ic-magnetic scattering transform with an additional little group phase\, a
ssociated with pairs of electrically and magnetically charged particles. I
will discuss the general construction of such states. The resulting "pair
wise helicity" is identified with the quantized "cross product" of charges
e1 g2- e2 g1 for every charge-monopole pair\, and represents the extra a
ngular momentum stored in the asymptotic electromagnetic field. We define
a new kind ofpairwise spinor-helicity variable\, which serves as an additi
onal building block for electric-magnetic scattering amplitudes. We then c
onstruct the most general 3-point S-matrix elements\, as well as the full
partial wave decomposition for the 2 -> 2 fermion-monopole S-matrix. In pa
rticular\, we derive the famous helicity flip in the lowest partial wave a
s a simple consequence of a generalized spin-helicity selection rule\, as
well as the full angular dependence for the higher partial waves. We will
also discuss a possible direction for resolving Callan's ``semiton" proble
m: the scattering amplitude of a positron on a GUT monopole which apparent
ly does not have an allowed final state. We will show that using entagled
pairwise helicity spinors a simple possible s-wave final state does exist.
\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joao Penedones
DTSTART:20211215T130000Z
DTEND:20211215T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/32
DESCRIPTION:Title: Talk by Joao Penedones\nby Joao Penedones as part of CE
RN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Patrick Huber
DTSTART:20220119T130000Z
DTEND:20220119T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/33
DESCRIPTION:Title: Fluxes and Interactions of Reactor Neutrinos\nby Patric
k Huber as part of CERN Theory Colloquia\n\n\nAbstract\nNeutrinos were dis
covered using a nuclear reactor as a source and since then much of our kno
wledge about neutrinos comes from experiments using reactors. I will brief
ly touch on the history of the use of reactors as neutrino source and moti
vate why they still play an important role today and in the future. An ove
rview of the physics of how neutrinos are generated in reactors and how we
can compute neutrino fluxes will follow. The developments of the past dec
ade will be reviewed in particular. 2021 may have seen the resolution of o
ne major riddle regarding the neutrino yield from uranium-235 and I will c
omment on this. I also will present the current status of the sterile neut
rino in electron neutrino disappearance including recent gallium results.
I will conclude with an outlook towards the future both for our understan
ding of the reactor neutrino flux and reactor neutrino measurements. I als
o will be touching on coherent elastic neutrino nucleus scattering at reac
tors.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Simmons-Duffin
DTSTART:20220216T150000Z
DTEND:20220216T160000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/34
DESCRIPTION:Title: Carving out gravitational theory space\nby David Simmon
s-Duffin as part of CERN Theory Colloquia\n\n\nAbstract\nIt has long been
expected that UV consistency of quantum gravity places constraints on low
energy observables. I will discuss new techniques for deriving such constr
aints -- techniques that arose through an interesting interplay between ef
fective field theory and the conformal bootstrap.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mark Van Raamsdonk
DTSTART:20220224T150000Z
DTEND:20220224T170000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/35
DESCRIPTION:Title: Cosmology from vacuum physics\nby Mark Van Raamsdonk as
part of CERN Theory Colloquia\n\n\nAbstract\nWe discuss a holographic app
roach to describing cosmological physics. The cosmological spacetime is en
coded in a special state of a four-dimensional quantum field theory that i
s not conventionally holographic. The state is produced via a Euclidean pa
th integral that includes a three-dimensional holographic theory at a boun
dary in the Euclidean past. The same Euclidean path integral can be used t
o define a dual static spacetime\, and the many of the observables in the
cosmology are equivalent to vacuum observables in the static spacetime. Th
is duality has interesting consequences\, for example it gives a simple ex
planation for correlations between regions of the universe that apparently
were never in causal contact. The model gives an effective field theory w
hose fundamental constant that is negative\, but generically will have a p
hase of accelerated expansion via a rolling scalar.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mao Zeng
DTSTART:20220302T130000Z
DTEND:20220302T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/36
DESCRIPTION:Title: Multi-loop scattering amplitudes and gravitational binary d
ynamics\nby Mao Zeng as part of CERN Theory Colloquia\n\n\nAbstract\nN
ext-generation gravitational wave detectors require highly precise predict
ions for the waveforms from inspiraling black holes and neutron stars. We
present advances in binary inspiral dynamics by taking classical limits of
scattering amplitudes in perturbative quantum gravity. The amplitudes are
calculated efficiently using modern methods for scattering amplitudes\, i
ncluding double copy and generalized unitarity\, and loop integration tech
niques borrowed from collider physics. Classical physics can be extracted
by several complementary approaches\, including effective field theory\, e
ikonal exponentiation\, and observables in wavepacket scattering. For both
conservative and dissipative dynamics of binary systems\, we obtain new t
erms in the post-Minksowskian expansion beyond the best previous results f
rom purely classical methods.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Claude Duhr
DTSTART:20220309T130000Z
DTEND:20220309T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/37
DESCRIPTION:Title: The dawn of N3LO\nby Claude Duhr as part of CERN Theory
Colloquia\n\n\nAbstract\nOver the last 5 years there was tremendous progr
ess in performing computations for hadron colliders at next-to-next-to-nex
t-to-leading order (N3LO) in the strong coupling constant. In particular\,
the computation of fully-inclusive N3LO cross sections for color-singlet
production is by now well understood. These results can serve as a templat
e to assess the impact and the importance of N3LO corrections. I will revi
ew the state-of-the-art of these computations and what we have learned abo
ut hadron collider phenomenology at N3LO.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shu-Heng Shao
DTSTART:20220316T130000Z
DTEND:20220316T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/38
DESCRIPTION:Title: Generalized Global Symmetries\nby Shu-Heng Shao as part
of CERN Theory Colloquia\n\n\nAbstract\nSymmetry has proven to be of fund
amental importance for describing Nature. I will discuss recent developmen
ts in various generalizations of global symmetries and their applications
in quantum field theory\, condensed matter physics\, and quantum gravity.
These generalized global symmetries exist ubiquitously in familiar quantu
m systems\, including the Ising model\, Maxwell theory\, lattice gauge the
ories\, and Yang-Mills theories. They also feature in more novel topologic
al phases of quantum matter such as fractons. These new symmetries can ha
ve generalized anomalies\, which lead to nontrivial dynamical consequences
on renormalization group flows and analytic constraints on the phase diag
ram of gauge theories. In the case of fractons and related exotic lattice
models in condensed matter theory\, the generalized global symmetry resul
ts in a surprising UV/IR mixing.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Clay Córdova
DTSTART:20220323T130000Z
DTEND:20220323T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/39
DESCRIPTION:Title: Secrets of the Renormalization Group\nby Clay Córdova
as part of CERN Theory Colloquia\n\n\nAbstract\nThe renormalization group
is a core idea of theoretical physics and organizes phenomena by energy sc
ale. Famously\, this flow is coarse graining: as one goes to longer dista
nces degrees of freedom are lost. In spite of this monotonicity there are
certain quantities\, intrinsically linked to general notions of symmetry
and anomalies\, that are constants of the renormalization group flow. I w
ill review some of these ideas and briefly discuss several recent applicat
ions\, including results about the behavior of Yang-Mills theory as a func
tion of the theta-angle.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Irene Valenzuela
DTSTART:20220406T120000Z
DTEND:20220406T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/40
DESCRIPTION:Title: The Quantum Gravity Imprint at Low Energies\nby Irene V
alenzuela as part of CERN Theory Colloquia\n\n\nAbstract\nConsistency with
quantum gravity can impose non-trivial constraints at low energies\, even
if the Planck scale is at very high energy. The Swampland program aims to
determine the constraints that an effective field theory must satisfy to
be consistent with a UV embedding in a quantum gravity theory. This has le
d to new quantum gravity constraints\, motivated by black hole physics and
string theory\, that can be used as new guiding principles to construct b
eyond standard models of Particle Physics and Cosmology. They might also p
rovide the missing piece to solve the long-standing naturalness issues obs
erved in our universe. In this talk\, I will review the most important Swa
mpland conjectures and recent developments regarding their connections and
phenomenological implications.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alvaro De Rujula
DTSTART:20220413T120000Z
DTEND:20220413T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/41
DESCRIPTION:Title: The gravitational wave and short gamma-ray burst GW170817/S
HB170817A\, not your everyday binary neutron star merger\nby Alvaro De
Rujula as part of CERN Theory Colloquia\n\n\nAbstract\nThe splendid data\
, theory and analysis of the gravitational wave GW170817 --the neutron sta
r merger that was also seen across the electromagnetic spectrum as SHB1708
17A*-- are well known to cosmologists and particle physicists. Some of the
m are perhaps less familiar with the SHB and with what the GW wave and the
SHB imply for each other’s understanding. My intention is to attempt to
fill this possible gap in their information.\n\n*) SHB stands for Short
Hard (gamma-ray) Burst\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mark Hindmarsh
DTSTART:20220420T120000Z
DTEND:20220420T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/42
DESCRIPTION:Title: Probing phase transitions in the early universe with gravit
ational waves\nby Mark Hindmarsh as part of CERN Theory Colloquia\n\n\
nAbstract\nGravitational waves will be an important probe of physics beyon
d the Standard Model\, as they would be produced at possible first order p
hase transitions in the early universe. I will discuss the characteristic
spectrum of gravitational radiation from phase transitions\, how it is con
nected to underlying physics\, and prospects for observing measuring therm
odynamic parameters at the future space-based gravitational wave detector
LISA.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sebastian Mizera
DTSTART:20220427T120000Z
DTEND:20220427T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/43
DESCRIPTION:Title: What is the iε for the S-matrix?\nby Sebastian Mizera
as part of CERN Theory Colloquia\n\n\nAbstract\nCan the S-matrix be comple
xified in a way consistent with causality? Since the 1960's\, the affirmat
ive answer to this question has been well-understood for 2→2 scattering
of the lightest particle in theories with a mass gap at low momentum trans
fer\, where the S-matrix is analytic everywhere except at normal-threshold
branch cuts. We ask whether an analogous picture extends to realistic the
ories\, such as the Standard Model\, that include massless fields\, UV/IR
divergences\, and unstable particles. Especially in the presence of light
states running in the loops\, the traditional iε prescription for approac
hing physical regions might break down\, because causality requirements fo
r the individual Feynman diagrams can be mutually incompatible. We demonst
rate that such analyticity problems are not in contradiction with unitarit
y. Instead\, they should be thought of as finite-width effects that disapp
ear in the idealized 2→2 scattering amplitudes with no unstable particle
s\, but might persist at higher multiplicity. To fix these issues\, we pro
pose an iε-like prescription for deforming branch cuts in the space of Ma
ndelstam invariants without modifying the analytic properties. This proced
ure results in a complex strip around the real part of the kinematic space
\, where the S-matrix remains causal.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/43/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Enrico Pajer
DTSTART:20220504T120000Z
DTEND:20220504T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/44
DESCRIPTION:Title: A timeless history of time\nby Enrico Pajer as part of
CERN Theory Colloquia\n\n\nAbstract\nCosmological observations give us the
unique opportunity to probe the fundamental laws of physics at very high
energies as well as the perturbative regime of quantum gravity. Unfortunat
ely\, due to the creativity of theorists and the paucity of data about the
primordial universe\, there are many models that are still compatible wit
h all measurements\, featuring a wide variety of mechanisms\, symmetries\,
and spectra of particles. The reason can be traced back to the fact that
we don't observe the time evolution during inflation\, but only its final
outcome.\nIn this talk\, I report on the recent progress in developing a n
ew "bootstrap" approach to derive predictions from the very early universe
that makes no reference to the un-observable time evolution. The bootstra
p approach builds directly upon the fundamental pillars of physics. In par
ticular\, I will present the recent breakthroughs in understanding the con
sequence of unitarity for cosmological correlators to all orders in pertur
bation theory\, as well as the footprint of (bulk) locality. These princip
les can be used to derive many classical and new inflationary predictions
associated with primordial non-Gaussianity in a way that is both computati
onally simpler and conceptually more transparent. Topics to be presented i
nclude a reconstruction formula that relates de Sitter correlators to ampl
itudes for massless particles\, cosmological partial-energy recursion rela
tions and a "timeless" differential representation of the perturbative wav
efunction. The approach makes no reference to de Sitter boosts\, which are
broken by a large amount in models that predict large non-Gaussianity. I
will conclude with speculations on how these results give us a handle on n
on-perturbative effects in cosmology either from cosmological positivity b
ounds or from de Sitter holography.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/44/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lina Necib
DTSTART:20220511T120000Z
DTEND:20220511T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/45
DESCRIPTION:Title: Tracing Dark Matter with Stars around the Milky Way\nby
Lina Necib as part of CERN Theory Colloquia\n\n\nAbstract\nIn this talk\,
I explore the impact of stellar kinematics on understanding the particle
nature of Dark Matter in four separate locations: the solar neighborhood\,
the Galactic center\, dwarf galaxies\, and streams. I first discuss the i
mplications of the different stellar components on direct detection experi
ments. I show how to use the velocity distribution of stars in the solar n
eighborhood to determine the empirical velocity distribution of Dark Matte
r\, critical for direct detection. I then use an example of a Dark Matter
candidate annihilating to gamma rays in the Galactic Center to motivate th
e need for accurate measurements of the Dark Matter density profile. Subse
quently\, I motivate the need for better understanding of the density prof
iles of dwarf galaxies given their large implications on indirect detectio
n\, by analyzing mock data and reconstructing the inner slope of the Dark
Matter profile. Finally\, I close by arguing for the importance of streams
in identifying the Dark Matter subhalo population\, and present a new str
eam finding algorithm called Via Machinae based on unsupervised machine le
arning techniques.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cora Dvorkin
DTSTART:20220518T120000Z
DTEND:20220518T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/46
DESCRIPTION:Title: Unlocking New Physics out of Astrophysical Data Sets\nb
y Cora Dvorkin as part of CERN Theory Colloquia\n\n\nAbstract\nCosmologica
l observations and galaxy dynamics have shown us that 84% of all matter in
the universe is composed of dark matter\, which is not accounted for by t
he Standard Model of particles. The nature and interactions of dark matter
remain one of the great puzzles of fundamental physics.\nThe wealth of kn
owledge which is and will soon be available from astrophysical surveys wil
l reveal new information about our universe. I will discuss new ways to us
e current and upcoming data sets to improve our understanding of the parti
cle content of our universe both at large and small scales.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gudrun Hiller
DTSTART:20220525T120000Z
DTEND:20220525T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/47
DESCRIPTION:Title: The same\, yet not the same: how to crack a paradigm (Flavo
r anomalies: status and prospects)\nby Gudrun Hiller as part of CERN T
heory Colloquia\n\n\nAbstract\nThe behavior of matter is ruled by the stan
dard model of particle physics -- really? Old puzzles and new evidences fr
om precision measurements are lurking and pose challenges to standard theo
ry. Deviations in processes as rare as one in a billion suggest that elect
rons and muons are more different than thought: they should behave the sam
e according to the standard model\, yet\, recent data from the Large Hadro
n Collider in Geneva finds them to behave differently. If taken at face va
lue\, this anomaly heralds a very loud breakdown of the standard model\,
and requires out-of-the-box new physics.\nIntriguingly\, cracking this wit
h leptoquarks\, i.e.\, new particles which share features from quarks and
leptons alike\, also open doors into the notorious and longstanding flavor
puzzle. This talk reports on the rise of the anomalies in flavor physics\
, rare decays of beauty quarks and further cracks in the building.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/47/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mari Carmen Bañuls
DTSTART:20220601T120000Z
DTEND:20220601T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/48
DESCRIPTION:Title: Tensor Networks: entanglement and the simulation of quantum
many-body problems\nby Mari Carmen Bañuls as part of CERN Theory Col
loquia\n\n\nAbstract\nThe term Tensor Network States (TNS) designates a nu
mber of ansatzes that can efficiently represent certain states of quantum
many-body systems. In particular\, ground states and thermal equilibrium o
f local Hamiltonians\, and\, to some extent\, real time evolution can be n
umerically studied with TNS methods. Quantum information theory provides t
ools to understand why they are good ansatzes for physically relevant stat
es\, and some of the limitations connected to the simulation algorithms.\n
\nOriginally introduced in the context of condensed matter physics\, thes
e methods have become a state-of-the-art technique for strongly correlated
one-dimensional systems. Their applicability extends nevertheless to othe
r fields. As an example\, in the last few years it has been shown that TNS
are also suitable to study lattice gauge theories and other quantum field
problems. This talk gives an overview of the possibilities and limitation
s of these methods\, and some of their recent applications to this kind of
problems.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/48/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soeren Schlichting
DTSTART:20220608T120000Z
DTEND:20220608T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/49
DESCRIPTION:Title: Thermalization of QCD plasmas\nby Soeren Schlichting as
part of CERN Theory Colloquia\n\n\nAbstract\nOver the past decades experi
ments at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron C
ollider (LHC) have discovered the formation of a de-confined Quark-Gluon P
lasma (QGP) \, and established a standard picture of the space-time evolut
ion of the QGP based on relativistic viscous hydrodynamics. While high-ene
rgy heavy-Ion collisions thus provide a unique laboratory to study QCD mat
ter under extreme conditions\, it has proven challenging to understand how
the far-from equilibrium matter created in the collision turns into a nea
rly equilibrated plasma of quarks and gluons. Starting with a brief introd
uction\, I will highlight recent theoretical progress in understanding the
rmalization mechanisms in QCD plasmas and address the question how an almo
st equilibrated Quark-Gluon plasma is created during the early stages of h
igh-energy collisions. I will also discuss how these studies provide new i
nsights into the range of applicability of dissipative fluid dynamics and
how an improved understanding of the out-of-equilibrium dynamics of the QG
P enables new connections between hot QCD and cold QCD research.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/49/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michelangelo Mangano
DTSTART:20220615T120000Z
DTEND:20220615T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/50
DESCRIPTION:Title: Why FCC?\nby Michelangelo Mangano as part of CERN Theor
y Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/50/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Shifman
DTSTART:20220622T120000Z
DTEND:20220622T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/51
DESCRIPTION:Title: 50 Years of Supersymmetry\nby Michael Shifman as part o
f CERN Theory Colloquia\n\n\nAbstract\nCERN was one of the birthplaces of
four-dimensional supersymmetry. 50 years elapsed after SUSY inception —
a time long enough for a comprehensive review of its impact on high energy
physics\, quantum field theory\, mathematical physics and beyond. In this
Colloquium I present a broad picture avoiding too technical aspects and e
mphasizing the most important achievement and prospects for the future.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/51/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mikhail Solon
DTSTART:20220629T120000Z
DTEND:20220629T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/52
DESCRIPTION:Title: Quantum Field Theory Tools for Gravitational Wave Science\nby Mikhail Solon as part of CERN Theory Colloquia\n\n\nAbstract\nFutur
e gravitational wave detectors will map out and characterize every binary
merger in the history of the universe. The possibilities for new and unexp
ected scientific discoveries from this wealth of data is staggering\, but
hinges crucially on complementary advances in our theoretical understandin
g of the nature of gravitational wave sources. However\, the path from Ein
stein’s equation to precision binary dynamics is notoriously difficult\,
and conventional methods may not scale to the demands of future detectors
. I will describe our recent efforts in solving the relativistic two-body
problem using tools from quantum field theory.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/52/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stefan Antusch
DTSTART:20220706T120000Z
DTEND:20220706T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/53
DESCRIPTION:Title: Lepton Number Violation at Colliders via Heavy Neutrino-Ant
ineutrino Oscillations\nby Stefan Antusch as part of CERN Theory Collo
quia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/53/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Douglas Stanford
DTSTART:20220824T150000Z
DTEND:20220824T160000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/54
DESCRIPTION:Title: Wormhole effects in quantum black hole physics\nby Doug
las Stanford as part of CERN Theory Colloquia\n\n\nAbstract\nA powerful id
ea in theoretical physics is the conjecture that (from a distance) black h
oles behave like ordinary quantum systems. Thought of in this way\, black
holes display many deep quantum phenomena in simple but often surprising w
ays. We will discuss recent work (involving wormholes) that gives new exam
ples of this and also uncovers new puzzles.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/54/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Susanne Reffert
DTSTART:20220928T120000Z
DTEND:20220928T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/55
DESCRIPTION:Title: The large charge expansion\nby Susanne Reffert as part
of CERN Theory Colloquia\n\n\nAbstract\nOver the last few years\, it has b
ecome clear that working in sectors of large global charge leads to signif
icant simplifications when studying strongly coupled CFTs\, theories which
are otherwise often inaccessible to analytic methods. It allows us in par
ticular to calculate the CFT data as an expansion in inverse powers of the
large charge. \nIn this talk\, I will introduce the large-charge expansio
n via the simple example of the O(2) model and will then generalize it to
the O(N) vector model which displays a richer structure due to its non-Abe
lian global symmetry group. Using large-N methods in conjunction with larg
e charge gives us even more control over the dynamics and lets us study th
e system away from the conformal point.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/55/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Harlow
DTSTART:20221005T120000Z
DTEND:20221005T130000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/56
DESCRIPTION:Title: The black hole interior from non-isometric codes and comple
xity\nby Daniel Harlow as part of CERN Theory Colloquia\n\n\nAbstract\
nI'll give an overview of recent work with Akers\, Engelhardt\, Penington\
, and Vardhan\, in which we propose a general framework for understanding
the emergence of the black hole interior and the resolution of the informa
tion problem. Many previous ideas\, such as null states\, non-linearity\,
post-selection\, the QES calculation of the Page curve\, and computationa
l complexity\, arise naturally in this framework.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/56/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jasmine Therese Brewer
DTSTART:20221012T120000Z
DTEND:20221012T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/57
DESCRIPTION:Title: Jets as a probe of the quark-gluon plasma\nby Jasmine T
herese Brewer as part of CERN Theory Colloquia\n\n\nAbstract\nThe quark-gl
uon plasma produced in heavy-ion collisions provides unique access to many
-body phenomena in QCD. This high temperature phase of QCD matter can be s
tudied through its interactions with high-energy partons\, called jets\, t
hat are also produced in these collisions. We will discuss some of the mod
ern advances and challenges of studying the quark-gluon plasma using the p
henomenology of the modification of the structure of jets. A promising ave
nue forward is to dig into the detailed structure of jets by studying them
splitting-by-splitting. I will discuss the unique phenomenology of one pa
rticular such splitting\, gluon splitting to charm quarks.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/57/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tim Cohen
DTSTART:20221019T120000Z
DTEND:20221019T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/58
DESCRIPTION:Title: Three Effective Field Theory Vignettes\nby Tim Cohen as
part of CERN Theory Colloquia\n\n\nAbstract\nI will describe some recent
work on applying Effective Field Theory (EFT) methodology to three differe
nt physically interesting systems. First I will explain the philosophy an
d general methodology of EFT. I will then present three short vignettes.
The first has to do with techniques for systematically computing the EFT
parameters from a given more fundamental description. The second will sho
w how EFT can be used to understand the behavior of quantum fields in an i
nflationary background\, with applications to light scalar fields and the
inflaton itself. And in the third\, I will show how EFT ideas can be appl
ied to systematically improve a numerical technique for quantum field theo
ry known as Hamiltonian truncation.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/58/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Liam McAllister
DTSTART:20221026T130000Z
DTEND:20221026T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/59
DESCRIPTION:Title: Small Cosmological Constants in String Theory\nby Liam
McAllister as part of CERN Theory Colloquia\n\n\nAbstract\nI will present
a construction of vacua of string theory in which the magnitude of the cos
mological constant is exponentially small. The vacua are supersymmetric A
dS solutions in flux compactifications of type IIB string theory\, with al
l moduli stabilized. The vacuum energy is small because we ensure the exa
ct cancellation of all perturbative contributions\, through an explicit ch
oice of integer parameters determined by the topology and quantized fluxes
. The nonperturbative contributions that remain are exponential in these
integers. Finding cosmological constants of small magnitude in this lands
cape is exponentially easier than in Bousso-Polchinski landscapes\, but ex
tending our approach to positive cosmological constants in realistic unive
rses is a difficult open problem.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/59/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joseph Lykken
DTSTART:20221102T130000Z
DTEND:20221102T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/60
DESCRIPTION:Title: Prospects for experimental quantum gravity\nby Joseph L
ykken as part of CERN Theory Colloquia\n\n\nAbstract\nUnderstanding quantu
m gravity is one of the biggest intellectual challenges of modern science.
String theory and the related AdS/CFT correspondence provide a rigorous t
heoretical laboratory to address some aspects of quantum gravity\, and a f
ew semi-classical quantum gravity effects\, notably the existence of Hawki
ng radiation\, are well-established and understood. However we are strongl
y handicapped by the inability to perform experiments that probe quantum g
ravity effects directly. In recent years a series of results have establis
hed a promising pathway towards exhibiting and exploring genuine quantum g
ravity effects in a laboratory setting. This pathway exploits what appears
to be a fundamental relationship between the connectedness of spacetime a
nd quantum entanglement\, as well as the holographic duality between certa
in bulk gravity phenomena and non-gravitational quantum systems. Both idea
s are realized in the phenomenon of traversable wormholes\, which have bee
n shown in the rigorous context of AdS/CFT to be a feature of semi-classic
al quantum gravity. Such wormholes are rendered traversable by a quantum e
ffect involving a flux of negative energy\, similar to the quantum phenome
non that enables Hawking radiation. Furthermore these wormholes have a hol
ographic dual description as a new form of quantum teleportation\, which c
an be explicitly realized in the dynamics of the SYK model with N interact
ing Majorana fermions. There is considerable evidence that N~100 should be
good enough to exhibit the key properties of traversable wormholes in a l
aboratory setting\, e.g.\, by producing the dynamics on a quantum processo
r. I will describe how such experiments might be performed and what we cou
ld learn from them.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/60/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthew Schwartz
DTSTART:20221116T090000Z
DTEND:20221116T110000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/61
DESCRIPTION:Title: Machine Learning for Amplitudes\nby Matthew Schwartz as
part of CERN Theory Colloquia\n\n\nAbstract\nMachine learning is playing
an increasingly large role in much of science. In high energy physics it h
as already revolutionized many aspects of experimental and theoretical col
lider physics. Collider physics is well suited to machine learning partly
because the problems are largely numerical. However\, much of high energy
theory is largely symbolic. Can machine learning help in these areas too?
Inspired by the impressive success of large language models in recent year
s\, progress on symbolic problems should be possible. In this talk I will
review some elements of symbolic learning\, including reinforcement learni
ng and transformer networks\, and discuss applications to the field of sca
ttering amplitudes. In particular\, I will discuss how the task of simplif
ying a scattering amplitude to a simpler symbolic form.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/61/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leonardo Senatore
DTSTART:20221123T130000Z
DTEND:20221123T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/62
DESCRIPTION:Title: The Effective Field Theory of Large-Scale Structure\nby
Leonardo Senatore as part of CERN Theory Colloquia\n\n\nAbstract\nThe Eff
ective Field Theory of Large-Scale Structure describes the long wavelength
dynamics of the density perturbations in the universe. I will review the
theory and the application to data\, including some recent developments.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/62/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marc Kamionkowski
DTSTART:20221207T130000Z
DTEND:20221207T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/63
DESCRIPTION:Title: The cosmic optical background excess\, line-intensity mappi
ng\nby Marc Kamionkowski as part of CERN Theory Colloquia\n\nAbstract:
TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/63/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michele Maggiore
DTSTART:20221214T130000Z
DTEND:20221214T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/64
DESCRIPTION:Title: Fundamental physics and cosmology with the Einstein Telesco
pe\nby Michele Maggiore as part of CERN Theory Colloquia\n\n\nAbstract
\nThe Einstein Telescope is a proposed third-generation gravitational wav
e detector\, to be build in Europe in the next decade. Its sensitivity wil
l allow us to explore the depths on the Universe with gravitational waves.
It is expected to detect of order 10^5 binary black holes and binary neu
tron stars per year\, with binary black holes potentially detectable up
to redshift z=O(100) and binary neutron stars up to z\\simeq 3. Many of th
ese signals will be reconstructed with remarkable accuracy\, up to cosmolo
gical distances. We will discuss the impact that these observations might
have on fundamental physics\, cosmology and astrophysics.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/64/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Martin Beneke
DTSTART:20230118T130000Z
DTEND:20230118T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/65
DESCRIPTION:Title: Nonperturbative and quantum effects in electroweak WIMP ann
ihilation\nby Martin Beneke as part of CERN Theory Colloquia\n\n\nAbst
ract\nAn electroweak WIMP with TeV mass is a minimal and viable dark-matte
r candidate. Owing to the large dark-matter mass\, the relevant electrowea
k interactions exhibit many features more familiar from the strong interac
tion. Predicting the dark-matter abundance and cosmic gamma-ray signal fro
m dark-matter annihilation reliably requires understanding the electroweak
static potential\, resonant behaviour and unitarity violation\, electrowe
ak bound states\, electroweak jets and Sudakov resummation\, and possibly
thermal effects in the plasma. In this seminar I discuss the diverse physi
cal and field theoretical phenomena associated with TeV mass WIMPS approac
hing them with effective field theories and resummation methods familiar f
rom QCD.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/65/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nathaniel Craig
DTSTART:20230201T130000Z
DTEND:20230201T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/66
DESCRIPTION:Title: Predicting the Higgs Mass\nby Nathaniel Craig as part o
f CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/66/
END:VEVENT
BEGIN:VEVENT
SUMMARY:LANCE Dixon
DTSTART:20230208T130000Z
DTEND:20230208T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/67
DESCRIPTION:Title: The DNA of Particle Scattering\nby LANCE Dixon as part
of CERN Theory Colloquia\n\n\nAbstract\nScattering amplitudes are where qu
antum field theory meets particle experiments\, especially at the LHC wher
e the copious scattering of quarks and gluons in QCD produces Higgs bosons
and many backgrounds to new physics searches. For decades\, it has been
realized that the scattering of particles in gauge theories like QCD is fa
r simpler than standard perturbative approaches would suggest. New approac
hes based on unitarity and bootstrapping have massively simplified many co
mputations previously done with Feynman diagrams. Still\, the final resul
ts are often highly intricate\, multivariate mathematical functions\, whic
h are difficult to describe\, let alone compute. In many cases\, the func
tions have a "genetic code" underlying them\, called the symbol\, which re
veals their structure. The symbol of such a function is a linear combinati
on of words\, sequences of letters analogous to sequences of DNA base pair
s. Understanding the alphabet\, and then reading the code\, exposes the p
hysics and mathematics underlying the scattering process. Remarkably\, th
e two scattering amplitudes known to the highest orders in perturbation th
eory (7 and 8 loops\, in planar N=4 super-Yang-Mills theory) are related t
o each other by a mysterious antipodal duality\, which involves reading th
e code backwards as well as forwards. This duality can now be embedded in
a larger\, but still mysterious\, "antipodal self-duality".\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/67/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sakura Schafer-Nameki
DTSTART:20230215T130000Z
DTEND:20230215T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/68
DESCRIPTION:Title: Non-Invertible Symmetries\nby Sakura Schafer-Nameki as
part of CERN Theory Colloquia\n\n\nAbstract\nSymmetries play a key role in
almost any context in theoretical physics. In the past year a new type of
symmetry was uncovered\, so-called non-invertible symmetries. Unlike stan
dard fare symmetries they do not obey group-multiplication\, but generally
do not have inverses. I will give examples of such symmetries and provide
some applications to QFTs in various dimensions.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/68/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joan Elias Miro
DTSTART:20230222T130000Z
DTEND:20230222T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/69
DESCRIPTION:Title: Bridging Positivity and S-matrix Bootstrap bounds\nby J
oan Elias Miro as part of CERN Theory Colloquia\n\n\nAbstract\nIn this tal
k I will show how to isolate Effective Field Theory scattering amplitudes
in the space of non-perturbative two-to-two amplitudes\, using the S-matri
x Bootstrap. I will show that this construction leads to novel bounds on o
perators of dimension less than or equal to six\, and specupate about futu
re aplications to the SM EFT.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/69/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giulia Zanderighi
DTSTART:20230301T130000Z
DTEND:20230301T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/70
DESCRIPTION:Title: Determination of the strong coupling using power correction
s in the three-jet region\nby Giulia Zanderighi as part of CERN Theory
Colloquia\n\n\nAbstract\nIn the determination of the strong coupling cons
tant from event shape variables in e+e- collisions\, there has been a long
-standing discrepancy between determinations that rely on analytic models
for the non-perturbative corrections\, and those that model hadronization
corrections with Monte Carlo generators. Analytic approaches calculate non
-perturbative corrections in the 2-jet region and apply them also to the 3
-jet region. We study the impact of the new calculation of non-perturbati
ve corrections in the 3-jet region and address whether the these calculat
ions lift the tension in the determination of alpha_s. Other findings and
considerations will also be discussed.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/70/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jaroslav Trnka
DTSTART:20230308T130000Z
DTEND:20230308T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/71
DESCRIPTION:Title: Non-perturbative Amplituhedron Geometries\nby Jaroslav
Trnka as part of CERN Theory Colloquia\n\n\nAbstract\nI will discuss some
new developments in the context of the Amplituhedron construction for plan
ar N=4 SYM scattering amplitudes. I will define a negative Amplituhedron g
eometry which provides an all-loop order definition for a certain IR finit
e quantity\, related to the ratio of null polygonal Wilson loops. Then I w
ill show that the Amplituhedron picture suggests an interesting expansion
of this quantity in terms of "loops of loops"\, unrelated to the usual sma
ll coupling expansion. In the leading order\, I will provide an exact resu
lt to all orders in the coupling\, and show the relation to the cusp anoma
lous dimension. Finally\, I will discuss a certain interesting deformation
of the geometric construction\, and then conclude with future directions.
\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/71/
END:VEVENT
BEGIN:VEVENT
SUMMARY:John Beacom
DTSTART:20230315T130000Z
DTEND:20230315T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/72
DESCRIPTION:Title: Frontiers in Neutrino Astronomy\nby John Beacom as part
of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/72/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gino Isidori
DTSTART:20230329T120000Z
DTEND:20230329T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/73
DESCRIPTION:Title: Decoding flavour hierarchies: an essential key to physics b
eyond the SM\nby Gino Isidori as part of CERN Theory Colloquia\n\n\nAb
stract\nFlavour physics represents one of the most fascinating puzzles of
particle physics. I will discuss some recent developments in this field\,
both from a theoretical perspective and from a more phenomenological point
of view. I will focus in particular on the idea of flavour non-universal
gauge interactions\, as a way to address the origin of the observed flavou
r hierarchies while allowing a minimal destabilisation of the electroweak
sector. The implications of this class of models for both flavour physics
experiments (analysing in particular the status of various recent anomalie
s) and high-energy searches will also be discussed.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/73/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ruth Durrer Zimmermann
DTSTART:20230405T120000Z
DTEND:20230405T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/74
DESCRIPTION:Title: Testing General Relativity with cosmological large scale st
ructure observations\nby Ruth Durrer Zimmermann as part of CERN Theory
Colloquia\n\n\nAbstract\nGeneral Relativity (GR) is immensely successful.
With the late discovery of gravitational waves from black hole and neutro
n star mergers\, it has passed all the tests with flying colors. But so f
ar\, all observations have mainly tested the vacuum equations of GR. The m
ost important non-vacuum case\, cosmology\, is in agreement with GR only a
fter the introduction of two otherwise unknown components\, 'Dark Matter'
and 'Dark Energy' which amount to about 96% of the total energy budget of
the present Universe. This led people in the field to question the validi
ty of GR for cosmology. Might it be that GR is flawed on large\, cosmologi
cal scales? Or in the presence of matter in general?\nBut how can we test
Einstein's equation in the presence of matter? Can't we simply move any mo
dification of the Einstein tensor to the right hand side and call it a 'da
rk matter/darkenergy' component?\nIn my talk I shall discuss possible ways
(partially) out of this dilemma. How to test both\, the left and the righ
t hand side of Einstein's equations with cosmological observations.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/74/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jose Ramon Espinosa Sedano
DTSTART:20230426T120000Z
DTEND:20230426T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/75
DESCRIPTION:Title: Applications of the Tunneling Potential Formalism\nby J
ose Ramon Espinosa Sedano as part of CERN Theory Colloquia\n\nAbstract: TB
A\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/75/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Paolo Gambino
DTSTART:20230510T120000Z
DTEND:20230510T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/76
DESCRIPTION:Title: The Vcb puzzle\nby Paolo Gambino as part of CERN Theory
Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/76/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stefan Floerchinger
DTSTART:20230517T120000Z
DTEND:20230517T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/77
DESCRIPTION:Title: Quantum field simulator for dynamics in curved spacetime\nby Stefan Floerchinger as part of CERN Theory Colloquia\n\n\nAbstract\n
Quantum fields in curved spacetimes have many tantalizing theoretical prop
erties\, for example particles are being produced by the time-dependence o
f the geometry. I will describe how quantum fields in geometries with spac
etime curvature and different cosmologies can be quantum-simulated with Bo
se-Einstein condensates in specifically designed trapping potentials and w
ith time-dependent interaction strengths. Analytical results for relativis
tic scalar fields in cosmologies with 2+1 spacetime dimensions will be com
pared with recent experimental results obtained in Heidelberg laboratories
.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/77/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elina Fuchs
DTSTART:20230524T120000Z
DTEND:20230524T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/78
DESCRIPTION:Title: Quantum sensing for New Physics and Gravitational Waves
\nby Elina Fuchs as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/78/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gregory Korchemsky
DTSTART:20230607T120000Z
DTEND:20230607T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/79
DESCRIPTION:Title: Integrability of high-energy QCD\nby Gregory Korchemsky
as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/79/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elina Fuchs
DTSTART:20230614T120000Z
DTEND:20230614T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/80
DESCRIPTION:Title: Quantum sensing for New Physics and Gravitational Waves
\nby Elina Fuchs as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/80/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Brian Fields
DTSTART:20230621T120000Z
DTEND:20230621T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/81
DESCRIPTION:Title: Big-Bang Nucleosynthesis: Beyond the Lithium Problem?\n
by Brian Fields as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/81/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Massimiliano Grazzini
DTSTART:20230705T120000Z
DTEND:20230705T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/82
DESCRIPTION:Title: The Higgs boson and the top quark: precision theory for the
LHC and beyond\nby Massimiliano Grazzini as part of CERN Theory Collo
quia\n\n\nAbstract\nThe Higgs boson and the top quark are the heaviest ele
mentary particles known to date. The study of their production and interac
tion is crucial to improve our understanding of the Standard Model\, and c
an possibly open a window on new physics. At the same time\, top quarks pr
ovide an ubiquitous background to Higgs studies and new-physics searches.
We review recent theoretical progress in precision computations of top-qua
rk production and related processes and present new results for ttH and tt
W production at next-to-next-to-leading order in QCD.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/82/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Masanori Hanada
DTSTART:20230712T120000Z
DTEND:20230712T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/83
DESCRIPTION:Title: From matrix model to string theory and M-theory\nby Mas
anori Hanada as part of CERN Theory Colloquia\n\n\nAbstract\nRecent develo
pment of quantum technologies suggest an exciting new direction of the stu
dy of quantum gravity: We might be able to create black holes! More precis
ely\, we might be able to use quantum devices to simulate (seemingly) non-
gravitational systems that are equivalent to quantum black holes via holog
raphy. For such a purpose\, the D0-brane matrix model is probably the simp
lest target that has well-controlled limit that describes weakly-coupled g
ravity. \n\nIn this talk\, we show the latest results of numerical simulat
ions of the D0-brane matrix model. The duality between the matrix model an
d type IIA superstring theory is confirmed with a good precision\, includi
ng stringy corrections. Furthermore\, we find a new low-energy phase (conf
ined phase) and suggest that this phase describes M-theory. We further arg
ue that the matrix model can describe the eleven-dimensional Schwarzschild
black hole. \n\nIf time permits\, we will provide a rough resource estima
te for quantum simulation.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/83/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robert Wald
DTSTART:20230717T120000Z
DTEND:20230717T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/84
DESCRIPTION:Title: Quantum Superpositions of Massive Bodies and Gravitationall
y Mediated Entanglement\nby Robert Wald as part of CERN Theory Colloqu
ia\n\n\nAbstract\nWe analyze a gedanken experiment involving a quantum sup
erposition of a massive body and show that in order to avoid contradiction
s with complementarity and causality\, it is necessary for there to be bot
h quantized gravitational radiation and local vacuum fluctuations of the s
pacetime metric. We then improve upon this analysis by providing a precise
and rigorous description of the entanglement and decoherence effects. As
a by-product of our analysis\, we show that under the protocols of the ged
ankenexperiment\, there is no clear distinction between entanglement media
ted by the Newtonian gravitational field of a body and entanglement mediat
ed by on-shell gravitons emitted by the body. This suggests that Newtonian
entanglement implies the existence of graviton entanglement and supports
the view that the experimental discovery of Newtonian entanglement---as en
visioned in proposed experiments---provides evidence for the existence of
the graviton.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/84/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Antoine Petiteau
DTSTART:20230719T120000Z
DTEND:20230719T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/85
DESCRIPTION:Title: Science prospects for LISA\nby Antoine Petiteau as part
of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/85/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Surjeet Rajendran
DTSTART:20230726T120000Z
DTEND:20230726T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/86
DESCRIPTION:Title: A Causal Framework for Non-Linear Quantum Mechanics\nby
Surjeet Rajendran as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/86/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eiichiro Komatsu
DTSTART:20230913T120000Z
DTEND:20230913T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/87
DESCRIPTION:Title: Parity Violation in Cosmology\nby Eiichiro Komatsu as p
art of CERN Theory Colloquia\n\n\nAbstract\nParity symmetry is known to be
violated in the weak interaction. Do the physical laws behind the unsolve
d problems of modern cosmology - cosmic inflation\, dark matter\, and dark
energy - also violate parity symmetry? In this talk\, we will discuss the
oretical and observational possibilities of parity violation in cosmology\
, a topic that has received much attention in recent years.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/87/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthias Bartelmann
DTSTART:20230927T120000Z
DTEND:20230927T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/88
DESCRIPTION:Title: Kinetic field theory for cosmic structure formation\nby
Matthias Bartelmann as part of CERN Theory Colloquia\n\n\nAbstract\nKinet
ic field theory is a new analytic approach to cosmic structure formation w
hich avoids some of the notorious problems in this field. I will briefly r
eview the foundations of the theory and then highlight four recent results
\, concerning the asymptotic behaviour of power spectra\, a mean-field app
roximation to particle interactions\, perturbation theory\, and structure
formation in modified gravity.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/88/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christophe Grojean
DTSTART:20231011T120000Z
DTEND:20231011T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/89
DESCRIPTION:Title: Higgs and Beyond the Standard Model: from LHC to future col
liders\nby Christophe Grojean as part of CERN Theory Colloquia\n\nAbst
ract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/89/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Djuna Croon
DTSTART:20231018T120000Z
DTEND:20231018T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/90
DESCRIPTION:Title: Dark matter and celestial objects: new phenomenological opp
ortunities\nby Djuna Croon as part of CERN Theory Colloquia\n\n\nAbstr
act\nWe have known since the 1970s that most matter in the Universe is dar
k. To uncover dark matter’s particle nature\, we must turn over every st
one. In this talk\, we will delve into the potential interactions between
dark matter and celestial objects such as stars\, planets\, and compact ob
jects. Such interactions can change their formation\, evolutionary traject
ory\, and final faith in an observable way. I will highlight various examp
les and explore the resulting phenomenological opportunities in the coming
decade.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/90/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Juan Rojo
DTSTART:20231129T130000Z
DTEND:20231129T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/91
DESCRIPTION:Title: Physics with TeV Neutrinos from the LHC\nby Juan Rojo a
s part of CERN Theory Colloquia\n\n\nAbstract\nProton-proton collisions at
the LHC produce an immense flux of high-energy (up to several TeV) neutri
nos along the beam (forward) direction. The breakthrough observation of LH
C neutrinos by FASER and SND@LHC in March 2023 heralds a new era in partic
le physics. In this talk I present the unprecedented reach of current (FAS
ER\, SND@LHC) and future (FASER2\, AdvSND\, FLArE) forward LHC neutrino ex
periments for studies of SM and BSM physics\, focusing on their impact for
QCD and neutrino physics. I demonstrate that these experiments effectivel
y extend the CERN infrastructure with an Neutrino-Ion Collider\, enabling
novel opportunities to pin down hadronic structure\, opening a window to t
he gluon content of the proton in regions outside the coverage of any oth
er experiment\, and providing the first laboratory-based validation of cro
ss-sections relevant for high-energy astroparticle studies.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/91/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fernando Quevedo
DTSTART:20240214T130000Z
DTEND:20240214T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/92
DESCRIPTION:Title: On Quantum Transitions and the String Landscape\nby Fer
nando Quevedo as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/92/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Antonin Portelli
DTSTART:20240221T130000Z
DTEND:20240221T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/93
DESCRIPTION:Title: Challenges in high-precision determinations of CKM matrix e
lements using lattice QCD\nby Antonin Portelli as part of CERN Theory
Colloquia\n\n\nAbstract\nThe current precision on determining CKM matrix e
lements is below a per cent in several cases\, and tensions between result
s are present\, for example\, in the Vus/Vud plane. Investigating that pro
blem is essential for searching for new physics through weak decays. At th
is level of precision\, a crucial ingredient is the determination of radia
tive corrections to pseudoscalar meson weak decays. Those have been comput
ed mainly through effective field theories\, which can have uncontrolled u
ncertainties. It is\, therefore\, important for lattice QCD+QED simulation
s to provide accurate predictions from first principles.\n\nIn this talk\,
I will present various results\, mainly from the UKQCD collaboration\, il
lustrating several challenges faced when performing such calculations. The
first calculation at physical quark masses of radiative corrections to ka
on and pion was published in [1] after the pioneering work from [2]. A fea
ture of [1] is an uncomfortably sizeable systematic error due to theoretic
al uncertainties on higher-order finite-size corrections. I will present o
ur result and detail this issue based on the formalism established in [3].
I will conclude with future possible directions to address this problem.\
n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/93/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Miguel Escudero Abenza
DTSTART:20240313T130000Z
DTEND:20240313T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/94
DESCRIPTION:Title: Modern Neutrino Cosmology\nby Miguel Escudero Abenza as
part of CERN Theory Colloquia\n\n\nAbstract\nNeutrinos are ubiquitous in
cosmology and they always represent a substantial fraction of the energy d
ensity of the Universe. This makes cosmology a key arena to test the prope
rties of the most elusive particles in the Standard Model. In this talk\,
I will begin by first reviewing the various ways in which neutrinos impact
cosmological observables. I will discuss the origin of the cosmic neutrin
o background\, and how neutrino physics can alter BBN and the CMB. I will
then discuss three topics that I find timely in the context of precision c
osmology\, namely: 1) what is the value of Neff in the Standard Model and
how do we calculate it\, 2) what can cosmological observations tell us abo
ut BSM neutrino interactions\, and 3) how robust are the very stringent co
smological neutrino mass bounds.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/94/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Peter Skands
DTSTART:20240320T130000Z
DTEND:20240320T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/95
DESCRIPTION:Title: Anatomy of LHC Collisions - And Future Challenges\nby P
eter Skands as part of CERN Theory Colloquia\n\n\nAbstract\nI will give an
overview of our current picture of the physical mechanisms that are at pl
ay in LHC collisions\, and review the current state of the art of detailed
numerical models of these processes. I will explain why I believe we are
on the cusp of at least two exciting revolutions\, and outline some of the
main challenges in realising them. I will include a few measurement highl
ights from the Large Hadron Collider\, showcasing both successes and some
(interesting) failures.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/95/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jean-Yves Ollitrault
DTSTART:20240424T120000Z
DTEND:20240424T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/96
DESCRIPTION:Title: QCD thermodynamics from LHC data\nby Jean-Yves Ollitrau
lt as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/96/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gilad Perez
DTSTART:20240508T120000Z
DTEND:20240508T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/97
DESCRIPTION:Title: New era in dark matter searches the dawn of the (nuclear) c
locks\nby Gilad Perez as part of CERN Theory Colloquia\n\n\nAbstract\n
After a brief introduction related to ultralight (pseudo) scalar dark matt
er\, we are going to describe the current status of searches for ultraligh
t dark matter (UDM). We explain why modern clocks can be used to search fo
r both scalar and axion dark matter fields. We review existing and new typ
es of well-motivated models of UDM and argue that they all share one key i
ngredient - their dominant coupling is to the QCD/nuclear sector\, which e
xisting clocks are less sensitive to (although there are a few ways to cir
cumvent this challenge). We then focus on nuclear clocks to show why they
might improve our sensitivity to DM searches by 8-10 orders of magnitude i
n the near future\, and discuss some of the implications.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/97/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Krishna Rajagopal
DTSTART:20240612T120000Z
DTEND:20240612T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/98
DESCRIPTION:Title: Novel Probes of the Primordial Liquid\nby Krishna Rajag
opal as part of CERN Theory Colloquia\n\n\nAbstract\nHeavy ion collisions
reproduce droplets of the trillions-of-degrees-hot liquid that filled the
microseconds-old universe\, conventionally called quark-gluon plasma (QGP)
but better thought of as hot quark-gluon soup. Over the past couple of de
cades\, data obtained via recreating this primordial fluid have shown that
it is the most liquid liquid in the universe\, making it the first comple
x matter to form as well as the source of all protons and neutrons. After
a brief look back at what we have learned about the formation and properti
es of this original liquid from heavy ion collisions\, I will focus on the
road ahead\, in particular on new probes being developed to enable us to
use data from the LHC and RHIC to answer questions like: How does a strong
ly coupled liquid emerge\, given that what you will see if you can probe Q
GP with high resolution is weakly coupled quarks and gluons? How can we us
e jets to see the inner workings of QGP and answer this question? And how
does the droplet of QGP ripple after it has been probed by a passing jet?\
n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/98/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sophie Renner
DTSTART:20240619T120000Z
DTEND:20240619T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/99
DESCRIPTION:Title: New physics on the run from precision tests\nby Sophie
Renner as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/99/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Benjamin Frederick Farr
DTSTART:20240710T120000Z
DTEND:20240710T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/100
DESCRIPTION:Title: Hearing the forest for the trees: understanding LIGO/Virgo
's plurality of singularities\nby Benjamin Frederick Farr as part of C
ERN Theory Colloquia\n\n\nAbstract\nBefore the start of their current and
fourth observing run (O4)\, the LIGO and Virgo detectors had already colle
cted an impressive census of compact binary mergers in the local universe.
By the end of O2 in August 2017 the LIGO Scientific Collaboration and Vir
go Collaboration claimed a total of 10 binary black hole mergers and one b
inary neutron star merger. O3 spanned April 2019 through March 2020\, incl
uded many significant discoveries (e.g.\, neutron star-black hole binaries
\, surprisingly massive black holes)\, and culminated in the third catalog
of compact binary mergers\, GWTC-3\, raising the total catalog of confide
ntly detected binary mergers to 90. I will present some of what ground-bas
ed gravitational wave astronomy has taught us about compact binaries over
the last eight years\, and what may lie ahead.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/100/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Laurent Lellouch
DTSTART:20241002T120000Z
DTEND:20241002T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/101
DESCRIPTION:Title: Probing the Standard Model to 0.37 ppm with the muon anoma
lous magnetic moment\nby Laurent Lellouch as part of CERN Theory Collo
quia\n\n\nAbstract\nFor the past fifty years\, the Standard Model has been
hugely successful in describing subatomic phenomena. However\, recent mea
surements of the anomalous magnetic moment of the muon (a_mu) appear to ch
allenge that statement\, as they show a significant discrepancy with the r
eference Standard Model prediction. After providing an overview of the cur
rent experimental and theoretical landscape surrounding a_mu\, I will pres
ent a lattice QCD calculation of the contribution that currently limits th
e precision of the Standard Model's prediction for a_mu. When combined wit
h the other Standard Model contributions\, this calculation yields a predi
ction that differs from the experimental measurement by only 0.9 standard
deviations\, with an overall precision of 0.37 ppm.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/101/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hofie Hannesdottir
DTSTART:20241009T120000Z
DTEND:20241009T140000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/102
DESCRIPTION:Title: Analytic properties of scattering amplitudes\nby Hofie
Hannesdottir as part of CERN Theory Colloquia\n\n\nAbstract\nIn this talk
\, we will explore intricate ways in which physical principles are encoded
in scattering amplitudes. In particular\, we will discuss the imprints of
causality and crossing symmetry on the analyticity properties of scatteri
ng amplitudes\, and show how different observables can be related to one a
nother via analytic continuations. We highlight how such physical insights
can be leveraged to simplify computations in perturbation theory\, and de
epen our understanding of collider observables.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/102/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthew Lewandowski
DTSTART:20241030T130000Z
DTEND:20241030T150000Z
DTSTAMP:20260404T094342Z
UID:CERNTheoryColl/103
DESCRIPTION:Title: Physics of and from the large-scale structure of the Unive
rse\nby Matthew Lewandowski as part of CERN Theory Colloquia\n\n\nAbst
ract\nIt is expected that measurements of the large-scale structure of the
Universe will soon become our leading sources of fundamental cosmological
information. In this talk\, I will review some of the major progress\, bo
th theoretical and data-oriented\, that we have made in understanding the
physics of galaxy clustering\, as well as what we might hope to learn abou
t new physics (including primordial non-Gaussianities) from these measurem
ents. A key milestone in this direction has been the advent and developmen
t of the Effective Field Theory of Large-Scale Structure (EFT of LSS)\, a
theoretical framework that allows for a controlled and consistent perturba
tive expansion (analogous to the QFT loop expansion) of cosmological obser
vables on large scales. After reviewing galaxy clustering surveys and the
theoretical underpinnings of the EFT of LSS\, I will describe some recent
results. Overall\, we find that including higher-order predictions signifi
cantly increases the amount of information that can be reliably extracted
from existing data sets. This points to even larger gains from future surv
eys such as DESI\, Euclid\, and MegaMapper\, and opens the door to explori
ng exciting new physics with precision large-scale structure measurements.
\n
LOCATION:https://stable.researchseminars.org/talk/CERNTheoryColl/103/
END:VEVENT
END:VCALENDAR