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BEGIN:VEVENT
SUMMARY:Matthew Reece (Harvard U.)
DTSTART:20200525T140000Z
DTEND:20200525T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/1
DESCRIPTION:Title: A Swampland Tour: From Global Symmetries to Axion Physics\nby Ma
tthew Reece (Harvard U.) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe
Swampland program aims to distinguish effective quantum field theories th
at can potentially arise within UV-complete quantum gravity theories (“t
he Landscape”) from those that cannot (“the Swampland”). The most we
ll-established such criterion is that theories of quantum gravity never ha
ve exact global symmetries. I will discuss some generalizations and conseq
uences of this idea. In particular\, I will discuss work in progress (with
Heidenreich\, McNamara\, Montero\, Rudelius\, and Valenzuela) on how axio
n fields often play a crucial role in banishing global symmetries from a t
heory\, with potential phenomenological implications.\n\nsend email to if
tweb101@gmail.com for zoom link\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giuseppe Fanizza (I. Astrofisica\, Lisbon)
DTSTART:20200528T140000Z
DTEND:20200528T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/2
DESCRIPTION:Title: Averaging cosmological observables in the LSS surveys\nby Giusep
pe Fanizza (I. Astrofisica\, Lisbon) as part of IFT-Madrid Webinars\n\n\nA
bstract\nIn this talk I will discuss a systematic and rigorous classificat
ion of all the possible choices for averaging observables in cosmology. In
this regard\, the use of the so-called Geodesic Light-con gauge provides
simple expressions as I will show here. These new results will be compared
with the recent literature. Moreover\, I will discuss their impact on the
bias that they can induce in the estimation of statistical properties\, s
uch as mean value and dispersion. Finally\, the connection between all the
presented theoretical prescriptions\, the observations and the numerical
simulations for the case of the luminosity distance will be discussed.\n\n
send email to iftweb101@gmail.com to get zoom link\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pablo Bueno (Centro Atomico Bariloche (Argentina))
DTSTART:20200611T140000Z
DTEND:20200611T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/3
DESCRIPTION:Title: Reflected entropy\, symmetries and free fermions\nby Pablo Bueno
(Centro Atomico Bariloche (Argentina)) as part of IFT-Madrid Webinars\n\n
\nAbstract\nEntanglement entropy (EE) is an intrinsically divergent quanti
ty in quantum field theory (QFT). Recently\, a well-defined notion of von
Neumann entropy associated to pairs of spatial subregions has been propose
d both in the holographic context — where it has been argued to be relat
ed to the entanglement wedge cross section — and for general QFTs. I wil
l show that\, similarly to the EE\, the reflected entropy for Gaussian fer
mion systems can be simply obtained in terms of correlation functions and
I will explicitly evaluate it numerically for two intervals in the case of
a two-dimensional Dirac field. Then\, I will argue that the definition of
this “reflected entropy” can be canonically generalized in a way whic
h is particularly suitable for orbifold theories — those obtained by res
tricting the full algebra of operators to those which are neutral under a
global symmetry group. I will evaluate explicitly this new "type-I entropy
” for the $\\mathbb{Z}_2$ bosonic subalgebra of the Dirac field. A key r
ole in the construction is played by type-I von Neumann algebras\, which d
iffer from the usual type-III algebras associated to spatial regions in QF
T. Using the free-fermions case\, I will perform very explicit comparisons
between both types of algebras.\n\nEmail iftweb101@gmail.com to get zoo
m link\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Lenz (U. Durham (UK))
DTSTART:20200615T140000Z
DTEND:20200615T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/4
DESCRIPTION:Title: Per aspera ad astra: Impact of high precision standard model predict
ions for new physics searches\nby Alexander Lenz (U. Durham (UK)) as p
art of IFT-Madrid Webinars\n\n\nAbstract\nWe review recent progress in inc
reasing the precision of SM flavour observables\, like heavy hadron lifeti
mes or B-mixing. The latter observable turns out to be a severe constraint
on BSM models that try to explain the recently observed anomalies in the
flavour sector.\n\nEmail iftweb101@gmail.com to get zoom link\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maria Ubiali (DAMTP (Cambridge\, UK))
DTSTART:20200629T140000Z
DTEND:20200629T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/5
DESCRIPTION:Title: Can New Physics hide in the proton PDFs?\nby Maria Ubiali (DAMTP
(Cambridge\, UK)) as part of IFT-Madrid Webinars\n\n\nAbstract\nA major r
ecent breakthrough in global fits of the structure of the proton has been
the inclusion of a significant amount of precise LHC measurements. While t
his data provides important constraints\, especially on the poorly-know gl
uon and anti-quark PDFs\, it is crucial to avoid any contamination from po
tential beyond the Standard Model (BSM) effects that could be present in t
he high energy or transverse momentum tails of the fitted experimental dis
tributions. This problem is particularly acute for LHC data from Runs II a
nd III\, as well as for the future High-Luminosity Run\, where many PDF-se
nsitive observables will reach the few TeV region. In this talk\, I presen
t a first quantitative study aiming to study whether or not New Physics ef
fects can be reabsorbed into the fitted PDFs\, as well as the possibility
of setting up a global QCD fit to simultaneously constrain the proton stru
cture and New Physics dynamics.\n\nTo get zoom link\, write to iftweb101@g
mail.com\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Seyda Ipek (U.C. Irvine)
DTSTART:20200706T150000Z
DTEND:20200706T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/6
DESCRIPTION:Title: A Model of Neutrino Masses and the LHC\nby Seyda Ipek (U.C. Irvi
ne) as part of IFT-Madrid Webinars\n\n\nAbstract\nNeutrino masses cannot b
e explained within the Standard Model. Many new physics models address thi
s question by adding right-handed neutrinos to the SM. These right-handed
neutrinos are generally not expected to be observed at the LHC due either
to their large masses or small couplings to the SM particles. I will give
a different approach\, in which we account for the SM neutrino masses via
a pesudo-Dirac bino in an R-symmetric SUSY model. This model can be probed
by LHC jets+MET and leptoquarks searches. I will also talk about our ongo
ing work to look for a long-lived pseudo-Dirac bino at the LHC.\n\nTo get
Zoom link send email to iftweb101@gmail.com\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Akash Jain (U. of Victoria (Can))
DTSTART:20200928T140000Z
DTEND:20200928T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/7
DESCRIPTION:Title: Non-universality of Hydrodynamics\nby Akash Jain (U. of Victoria
(Can)) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe late-time long-d
istance behaviour of a many-body system is usually described by the framew
ork of hydrodynamics or similar condensed matter models based on the (poss
ibly spontaneously broken) symmetries that the system enjoys. These models
are characterised by a set of transport coefficients\, such as viscositie
s and conductivity\, that capture the transport properties of conserved ch
arges over macroscopic scales. In this talk\, we will investigate a new ki
nd of transport coefficients that are not present in the usual formulation
of hydrodynamics\, but nonetheless affect the late time dynamics of conse
rved charges. Physically\, these new coefficients arise due to the interac
tion of the hydrodynamic degrees of freedom with the background bath of th
ermal noise present out of equilibrium. For the purposes of this investiga
tion\, I will spend some time to review the newly developed Schwinger-Keld
ysh effective action formulation of non-equilibrium field theories\, which
allows one to systematically keep track of thermal noise and their correl
ations. The talk will be based on the recent preprint https://arxiv.org/ab
s/2009.01356.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sebastian Cespedes (IFT)
DTSTART:20201008T140000Z
DTEND:20201008T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/9
DESCRIPTION:Title: On the time evolution of cosmological correlation functions\nby
Sebastian Cespedes (IFT) as part of IFT-Madrid Webinars\n\n\nAbstract\nDev
eloping our understanding of how correlations evolve during inflation is c
rucial if we are to extract information about the early Universe from our
late-time observables. To that end\, we’ll revisit the time evolution of
scalar field correlators on de Sitter spacetime in the Schrodinger pictur
e. By direct manipulation of the Schrodinger equation\, it is possible to
write down simple “equations of motion” for the coefficients which de
termine the wavefunction. Rather than specify a particular interaction Ham
iltonian\, we assume only very basic properties (unitarity\, de Sitter inv
ariance and locality) to derive general consequences for the wavefunction
’s evolution. In particular\, we identify a number of “constants of mo
tion”: properties of the initial state which are conserved by any unitar
y dynamics. We further constrain the time evolution by deriving constraint
s from the de Sitter isometries and show that these reduce to the familiar
conformal Ward identities at late times. Finally\, we show how the evolut
ion of a state from the conformal boundary into the bulk can be described
via a number of “transfer functions” which are analytic outside the ho
rizon for any local interaction. These objects exhibit divergences for par
ticular values of the scalar mass\, and we show how such divergences can b
e removed by a renormalisation of the boundary wavefunction—this is equi
valent to performing a “Boundary Operator Expansion” which expresses t
he bulk operators in terms of regulated boundary operators. Altogether\, t
his improved understanding of the wavefunction in the bulk of de Sitter co
mplements recent advances from a purely boundary perspective\, and reveals
new structure in cosmological correlators.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simon Catterall (Syracuse U.)
DTSTART:20201019T140000Z
DTEND:20201019T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/10
DESCRIPTION:Title: N=4 Super Yang Mills on the Lattice\nby Simon Catterall (Syracu
se U.) as part of IFT-Madrid Webinars\n\n\nAbstract\nI will show how N=4 S
YM can be discretized on a lattice while preserving some supersymmetry. Re
cent improvements to the lattice action now allow simulations for arbitrar
ily strong 't Hooft coupling $\\lambda$. I will show some preliminary resu
lts for supersymmetric Wilson loops which clearly show the absence of conf
inement and the $\\sqrt{\\lambda}$ dependence at strong coupling expected
from holography.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Juan S. Cruz (Munich Tech. U.)
DTSTART:20201022T140000Z
DTEND:20201022T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/11
DESCRIPTION:Title: Gradient effects on false vacuum decay in gauge theory\nby Juan
S. Cruz (Munich Tech. U.) as part of IFT-Madrid Webinars\n\n\nAbstract\nW
e study false vacuum decay for a gauged complex scalar field in a polynomi
al potential with nearly degenerate minima. Radiative corrections to the p
rofile of the nucleated bubble as well as the full decay rate are computed
in the planar thin-wall approximation using the effective action. This al
lows to account for the inhomogeneity of the bounce background and the rad
iative corrections in a self-consistent manner. In contrast to scalar or f
ermion loops\, for gauge fields one must deal with a coupled system that m
ixes the Goldstone boson and the gauge fields\, which considerably complic
ates the numerical calculation of Green's functions. In addition to the re
normalization of couplings\, we employ a covariant gradient expansion in o
rder to systematically construct the counterterm for the wave-function ren
ormalization. The result for the full decay rate however does not rely on
such an expansion and accounts for all gradient corrections at the chosen
truncation of the loop expansion. The ensuing gradient effects are shown t
o be of the same order of magnitude as non-derivative one-loop corrections
.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matteo Baggioli (IFT)
DTSTART:20201029T150000Z
DTEND:20201029T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/12
DESCRIPTION:Title: Classifying and Understanding Phases of Matter with Effective Theor
ies\nby Matteo Baggioli (IFT) as part of IFT-Madrid Webinars\n\n\nAbst
ract\nEverything should be made as simple as possible\, but not simpler. T
his \n classic Einstein's quote summarizes beautifully the spirit of ef
fective\n field theories (EFTs)\, where the measure of simplicity is di
ctated by the\n symmetries of the system. In this talk\, I will promote
the role and the\n power of EFT methods by discussing with you some in
teresting open questions\n such as the difference between liquids and s
olids\, the nature of glassy \n materials and the role of periodicity i
n crystals. I will guide you through\n the different theoretical layers
\, from standard EFT and hydrodynamics to\n holographic techniques\, em
phasizing the leading role of spacetime\n symmetries and the wide range
of applicability of these methods.\n The talk is designed in a colloqu
ium format suitable for all IFT members from\n the 1st to 5th floor and
it will be my farewell to IFT after these 2 productive\n years.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anson Hook (U. Maryland)
DTSTART:20201026T150000Z
DTEND:20201026T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/13
DESCRIPTION:Title: Aharonov-Bohm in the Sky : A CMB Millikan Experiment with Cosmic Ax
iverse Strings\nby Anson Hook (U. Maryland) as part of IFT-Madrid Webi
nars\n\n\nAbstract\nWe show that photons moving around an axion string cou
pled to photons undergo an Aharonov-Bohm effect. As a result\, axion stri
ngs produce a distinct quantized polarization rotation of CMB photons whic
h can be as large as O(1%). As the CMB passes many strings\, this polariz
ation rotation converts E-modes to B-modes and adds up like a random walk.
We show that the expected size of the final result is well within the re
ach of current and future CMB experiments. The quantized polarization rot
ation angle is topological in nature and its value provides insight into t
he quantization of electric charge.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yotam Soreq (Technion)
DTSTART:20201105T150000Z
DTEND:20201105T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/14
DESCRIPTION:Title: Probing new physics at the precision frontier\nby Yotam Soreq (
Technion) as part of IFT-Madrid Webinars\n\n\nAbstract\nIn this talk we di
scuss different methods to probe new light physics at the precision fronti
er. Isotope shifts are measurements of atomic spectral lines (electronic t
ransitions) in different isotopes. We discuss the sensitivity of these mea
surements to probe new long range forces by using King and generalized Kin
g analyses in the light of the new experimental results. \nFinally\, we di
scuss the possibility to prove axion-like-particles by superconducting rad
io-frequency cavities.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pierre Auclair (U. Paris\, CNRS)
DTSTART:20201112T150000Z
DTEND:20201112T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/15
DESCRIPTION:Title: Primordial black holes from metric preheating: mass fraction in the
excursion-set approach\nby Pierre Auclair (U. Paris\, CNRS) as part o
f IFT-Madrid Webinars\n\n\nAbstract\nAfter inflation\, the oscillations of
the inflaton at the bottom of its potential source a parametric instabili
ty in the equation of motion of scalar perturbations. In a recent paper by
Martin et al. 2020\, it was shown that the production of ultra-light PBHs
from this instability is so efficient that they can quickly come to domin
ate the universe content. However their abundance is usually computed by a
ssuming that they are rare objects that are formed at around a single scal
e\, and the probability that a given region of the universe ends up in a b
lack hole can be inferred from the knowledge of the primordial curvature p
ower spectrum at that scale. Such an approach may however fail in cases wh
ere PBHs are abundantly produced\, and/or if they arise over a wide range
of masses.\n\nIn the present seminar\, I will first briefly describe the m
echanism of metric preheating and the production of PBHs that is associate
d to it. Then I will give a short introduction on the calculation of the m
ass fraction and more particularly the excursion set formalism. This frame
work translates the estimation of a mass fraction to the study of a Langev
in equation\; more particularly to the first crossing distribution of a La
ngevin trajectory with a moving barrier. Finally\, I will present the resu
lt of applying this formalism to the calculation of the mass fraction of P
BHs arising from metric preheating.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pier Paolo Giardino (IGFAE Santiago de Compostela)
DTSTART:20201116T150000Z
DTEND:20201116T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/16
DESCRIPTION:Title: EFT at the LHC and future colliders\nby Pier Paolo Giardino (IG
FAE Santiago de Compostela) as part of IFT-Madrid Webinars\n\nAbstract: TB
A\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rajamani Narayanan (Florida Int. U.)
DTSTART:20201123T150000Z
DTEND:20201123T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/17
DESCRIPTION:Title: A three-dimensional conformal field theory inspired by QED\nby
Rajamani Narayanan (Florida Int. U.) as part of IFT-Madrid Webinars\n\n\nA
bstract\nLattice studies have convincingly shown that parity invariant QED
in three dimensions is scale invariant for all values of number of flavor
s. This implies that the measure for the gauge field is conformal after th
e fermions have been integrated out. Assuming a quadratic action for the g
auge fields that is conformal\, it is possible to compute fermionic correl
ation functions on the lattice. The results so obtained match that of QED
for all values of flavors of interest. This numerical analysis is an examp
le of a study of an interacting conformal field theory on the lattice with
out the need for fine tuning.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anne Nielsen (MPI Dresden)
DTSTART:20201119T150000Z
DTEND:20201119T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/18
DESCRIPTION:Title: Special states in quantum many-body spectra\nby Anne Nielsen (M
PI Dresden) as part of IFT-Madrid Webinars\n\n\nAbstract\nWhile quantum ma
ny-body systems typically thermalize\, exceptions to thermalization provid
e interesting opportunities\, e.g. with respect to information storage. On
e possibility is that all states in the spectrum many-body localize. Anoth
er is a weak violation of thermalization\, in which a few special states i
n the spectrum do not thermalize\, while the rest do. This phenomenon is k
nown as quantum many-body scars.\n\nHere\, we propose and demonstrate that
one can similarly have a weak violation of many-body localization\, in wh
ich one or a few states in a spectrum have above area law entanglement\, w
hile the rest of the states are many-body localized. We show that this can
be achieved through a mechanism\, in which emergent symmetry of the speci
al states prevents many-body localization in these states. In addition\, w
e provide two examples of normal quantum many-body scars\, in which the sp
ecial states are topological.\n\nReferences: arXiv:2002.07824\, arXiv:2009
.03923\, arXiv:2009.00022\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Robaina (MPI Garching)
DTSTART:20201126T150000Z
DTEND:20201126T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/20
DESCRIPTION:Title: Studying 2D Lattice Gauge Theories with Tensor Networks\nby Dan
iel Robaina (MPI Garching) as part of IFT-Madrid Webinars\n\n\nAbstract\nF
or years Tensor Networks have been exploited to study many-body-physics pr
oblems mostly in the field of Condensed Matter Physics. Its application to
Lattice Gauge Theories is a much newer field. I will review the motivatio
n behind using Tensor Networks for Lattice Gauge Theories and introduce th
e state-of-the-art problems that are being tackled. The remainder of the t
alk will consist in showing how a particular type of Tensor Network called
Infinite Projected Entangled Pair States (iPEPS) can be used to simulate
a 2+1d Z_3 lattice gauge theory. This represents a crucial step towards at
tempting simulations of more challenging gauge groups and higher dimension
s.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:W.G. Hollik (KIT Karlsruhe)
DTSTART:20201203T150000Z
DTEND:20201203T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/21
DESCRIPTION:Title: Charting the Vacuum Landscape in SUSY benchmark scenarios\nby W
.G. Hollik (KIT Karlsruhe) as part of IFT-Madrid Webinars\n\n\nAbstract\nW
e review vacuum stability criteria in supersymmetric models and\ndescribe
a fast and efficient method to study these constraints. Explicitly\nin the
MSSM\, we arrive from general considerations to a dedicated analysis\nof
the vacuum stability landscape in phenomenologically favoured benchmark\ns
cenarios. Such a study allows to search for stable configurations in the\n
extended benchmark plane and classify the allowed regions from a vacuum\nl
ifetime perspective.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:V. Martin-Lozano (DESY)
DTSTART:20201210T150000Z
DTEND:20201210T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/22
DESCRIPTION:Title: Scalar taus at the LHC: How we will find them\nby V. Martin-Loz
ano (DESY) as part of IFT-Madrid Webinars\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francesco Montanari (IFT Madrid)
DTSTART:20201214T150000Z
DTEND:20201214T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/23
DESCRIPTION:Title: Dark matter constraints with Milky Way stellar dynamics\nby Fra
ncesco Montanari (IFT Madrid) as part of IFT-Madrid Webinars\n\n\nAbstract
\nI will show novel methods to constrain dark matter properties based on M
ilky Way stellar dynamics. First\, I will discuss a Bayesian framework to
search for correlations among Milky Way stellar trajectories and those of
globular clusters and dwarf galaxies in the halo and in other nearby galax
ies. Scattering events with compact objects are expected in the primordial
black hole cold dark matter scenario\, due to close encounters between st
ars and primordial black holes in the dense environments of dwarf spheroid
als. Second\, I will discuss how to optimally use the density profile of M
ilky Way stellar streams as a proxy to dark matter properties.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Viviana Gammaldi (IFT)
DTSTART:20201221T150000Z
DTEND:20201221T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/24
DESCRIPTION:Title: Indirect detection of (Multi-TeV) dark matter: recent results and n
ew goals\nby Viviana Gammaldi (IFT) as part of IFT-Madrid Webinars\n\n
\nAbstract\nIn the era of TeV observatories\, Multi-TeV Weak Interactive M
assive Particles (WIMPs) are interesting dark matter candidate\, among oth
ers. I will present an overview on this topic\, including some recent resu
lts and new research prospects. In particular\, I will show that a black-h
ole-induced DM-spike of Multi-TeV WIMPs well fits the Galactic Center cut-
off detected by HESS in the gamma rays. Nonetheless\, we can set further c
onstraints on the WIMP DM mass and annihilation cross section via the stud
y of both multi-messenger and multi-wavelength signals from several astrop
hysical targets\, e.g. recently proposed dwarf irregular galaxies. Finally
\, I will briefly introduce the branons as extra-dimensional Multi-TeV dar
k matter candidates.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Javier Molina Vilaplana (U. Cartagena)
DTSTART:20210111T150000Z
DTEND:20210111T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/25
DESCRIPTION:Title: Entanglement\, Holography and Tensor Networks\nby Javier Molina
Vilaplana (U. Cartagena) as part of IFT-Madrid Webinars\n\n\nAbstract\nIn
recent years\, it has been proposed that the space-time fabric could emer
ge from the entanglement patterns within the degrees of freedom of a dual
quantum many body theory.\n\nThese ideas have a natural arena to play with
in the field of tensor networks. There are many different types of tensor
networks\, but those on which much interest has been raised is MERA (mult
i-scale entanglement renormalization ansatz). Namely\, it has been noted t
hat the entanglement patterns within a quantum state given by a MERA tenso
r network\, resemble the structure of entanglement in AdS/CFT evinced by t
he Ryu-Takayanagi formula. This has led to the proposal that MERA could be
realization of this duality. Motivated\, by this\, a (non)perturbative ME
RA formalism\, able to deal with continuous interacting theories\, seems t
o be essential to advance in this program.\n\nHere\, we will briefly intro
duce a MERA formalism for interacting quantum field theories (icMERA). Our
results show that icMERA wavefunctionals encode proper non-Gaussian corre
lations of an interacting theory\, thus providing a new variational tool t
o study the connection between tensor networks and holography.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alvaro Martin Alhambra (MPI-Quantenoptick. Garching)
DTSTART:20210114T150000Z
DTEND:20210114T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/26
DESCRIPTION:Title: Quantum thermal states on the lattice: correlations\, area laws and
tensor network representations\nby Alvaro Martin Alhambra (MPI-Quante
noptick. Garching) as part of IFT-Madrid Webinars\n\n\nAbstract\nIn the pa
st couple of decades\, one of the biggest triumphs of quantum information
theory has been the characterization of correlations of ground states of q
uantum many-body systems. This usually takes the form of area laws for the
entanglement entropy\, which can be rigorously linked to the efficient cl
assical simulability of ground states. A similar intuition applies to ther
mal states\, which are known to obey an area law for the quantum mutual in
formation. Here\, we will present the tightest area laws known for quantum
thermal states on lattices\, with an improved dependence on the temperatu
re. These involve the mutual information\, as well as other information-th
eoretic measures of correlations\, such as the entanglement of purificatio
n. While the direct connection between thermal area laws and simulability
is still unknown\, we show how the same techniques that lead to improved a
rea laws also lead to provably efficient tensor network algorithms for the
rmal states. In doing so\, we provide the first rigorous quasilinear-time
algorithm for one-dimensional models\, which closely matches what is found
in heuristic numerical approaches.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luca Santoni (U. Columbia)
DTSTART:20210121T150000Z
DTEND:20210121T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/27
DESCRIPTION:Title: Symmetries of black hole perturbations\nby Luca Santoni (U. Col
umbia) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe direct detection
of gravitational waves has marked the dawn of the era of gravitational-wav
e astronomy. With an ever increasing number of observed black hole mergers
and with the possibility of precise measurements achievable with third-ge
neration and space-based detectors\, gravitational-wave astronomy is provi
ding us with a unique opportunity to test general relativity in the strong
-field regime. In order to understand how gravity works at the fundamental
level and explain some still unsolved mysteries about black holes and com
pact objects\, symmetries play a special role. Symmetries allow\, e.g.\, t
o make robust and model-independent predictions for the observables\, and
constrain broad classes of theories beyond general relativity. \nAfter a s
hort review of black hole perturbation theory\, I will discuss properties
of perturbations around Schwarzschild black holes. I will discuss\, in par
ticular\, the implications of symmetries at the level of the observables.
These include the quasi-normal mode spectrum and the static response of bl
ack holes\, a.k.a. the Love numbers. If time permits\, I will introduce an
effective field theory for perturbations around “hairy” black holes a
nd discuss how gravitational-wave observations could be used to constrain
the couplings of the operators in the theory.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yonit Hochberg (Hebrew U. Jerusalem)
DTSTART:20210118T150000Z
DTEND:20210118T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/28
DESCRIPTION:Title: New Directions for Light Dark Matter\nby Yonit Hochberg (Hebrew
U. Jerusalem) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe explorati
on of dark matter beyond the WIMP is of vital importance\ntowards resolvin
g the identity of dark matter. In this talk\, I will\nfocus on light dark
matter. From the theory side\, I will discuss new\ntheoretical development
s that suggest light dark matter. From the\nexperimental side\, I will pre
sent new proposals for the direct\ndetection of light dark matter which ho
ld much promise. These include\nthe use of superconducting nanowires\, two
-dimensional targets such as\ngraphene\, and Dirac materials. Considering
dark matter interactions\nwith these targets\, I will demonstrate the pote
ntial of the light dark\nmatter direct detection program in upcoming years
.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anna Tokareva (Jyvaskyla U. and Moscow\, INR)
DTSTART:20210128T150000Z
DTEND:20210128T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/29
DESCRIPTION:Title: Massless Positivity\nby Anna Tokareva (Jyvaskyla U. and Moscow\
, INR) as part of IFT-Madrid Webinars\n\n\nAbstract\nWe formulate Positivi
ty Bounds for scattering amplitudes including exchange of massless particl
es. We generalize the standard construction through dispersion relations t
o include the presence of a branch cut along the real axis in the complex
plane for the Maldestam variable s. In general\, validity of these bounds
require the cancellation of divergences in the forward limit of the amplit
ude\, proportional to 1/t and log(t). We show that this is possible in the
case of gravitons if one assumes a Regge behavior of the amplitude at hig
h energies below the Planck scale. The bounds that we present have the pot
ential of constraining very general models of modified gravity and EFTs of
matter coupled to gravitation.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marija Tomasevic (U. Barcelona)
DTSTART:20210204T150000Z
DTEND:20210204T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/30
DESCRIPTION:Title: Aspects of Traversable Wormholes\nby Marija Tomasevic (U. Barce
lona) as part of IFT-Madrid Webinars\n\n\nAbstract\nI will review some bas
ic features of traversable wormholes and discuss the progress made in the
past couple of years.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pedro Ferreira (ISEL and CFTC-UL\, Lisbon\, Portugal)
DTSTART:20210201T150000Z
DTEND:20210201T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/31
DESCRIPTION:Title: Multiscalar models - theoretical puzzles and LHC searches\nby P
edro Ferreira (ISEL and CFTC-UL\, Lisbon\, Portugal) as part of IFT-Madrid
Webinars\n\n\nAbstract\nThe Standard model contains a single elementary s
calar particle\, the Higgs boson\, discovered at the LHC in 2012. The Mode
l is remarkably successful\, but it leaves a great deal of unanswered ques
tions. There have been many attempts to addressed some of those open issue
s\, by enlarging the scalar sector\, thus predicting a richer spectrum of
spin-0 elementary particles. This allows one to create models where one ma
y: have Dark Matter candidates complying with all current experiemental co
nstraints\; predict spontaneous (or explicit) CP violation arising from th
e scalar sector\; or explain eventual excesses in LHC search channels.\n\n
A larger scalar spectrum\, however\, raises problems of its own: the size
of the parameter space increases\, with potentially a large number of para
meters with unknown values and ranges reducing the model's predictivity. T
he vacuum state of the theory is no longer guaranteed\, in many multiscala
r models\, to lead to the correct electroweak symmetry breaking. Tree-leve
l flavour changing neutral currents (FCNC) mediated by neutral scalars are
on many occasions possible\, the magnitude of those couplings heavily res
tricted by existing experimental data.\n\nIn this seminar I'll review the
basic constraints one needs to ask of multiscalar models to be certain it
is a viable model\; and the "tools of the trade" to help when one is creat
ing a model with specific purposes. I'll also show several recent results
discussing vacuum stability in several multiscalar models\; a simple solu
tion to the strong-CP problem\; constraints on multiscalar parameter space
from dark matter searches\; and exotic sources of CP violation.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kalliopi Petraki (Paris LPTHE and Nikhef\, Amsterdam)
DTSTART:20210211T150000Z
DTEND:20210211T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/32
DESCRIPTION:Title: Dark matter goes nuclear: overhauling thermal decoupling at the TeV
scale with bound states\nby Kalliopi Petraki (Paris LPTHE and Nikhef\
, Amsterdam) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe production
of dark matter via thermal decoupling from the primordial plasma\, and the
direct\, indirect and collider signals associated with this mechanism\, h
ave been the pillars of dark matter phenomenology in the past decades. In
sharp contrast to the sub-TeV regime\, the interactions of thermal-relic d
ark matter with multi-TeV or larger mass manifest as long-range. This is s
upported by unitarity arguments\, and shown by explicit calculations in WI
MP and other models. The long-range nature of the interactions gives rise
to non-perturbative effects\, with the most prominent being the existence
of bound states. The formation and decay of unstable bound states in the e
arly universe decrease the dark matter density\, thereby changing its pred
icted mass and/or couplings. This can have severe implications for all exp
erimental probes\, particularly for collider and indirect searches.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matteo Fasiello (IFT Madrid)
DTSTART:20210208T150000Z
DTEND:20210208T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/33
DESCRIPTION:Title: Probing Inflation with Primordial Messengers\nby Matteo Fasiell
o (IFT Madrid) as part of IFT-Madrid Webinars\n\n\nAbstract\nSome of our b
est ideas on early universe physics are about to be put to the test by an
unprecedented array of cosmological probes. The data these will collect sp
an a vast range of scales\, from the CMB to large scale structure\, from p
ulsar timing arrays all the way to laser interferometers. This combined we
alth of new information holds the potential to transform our understanding
of cosmology and\, possibly\, also particle physics. In this context prob
ing the earliest accessible epoch\, inflation\, is crucial: inflation can
provide a cosmological portal to otherwise inaccessible energy scales. Thi
s is the “cosmological collider” idea. The spectacular success of the
inflationary paradigm in explaining the origin of cosmic structure demands
that we tackle a number of compelling questions still in need of an answe
r: what is the energy scale of inflation? What fields were active during
inflation?\n\nIn this talk I will review recent progress on the inflation
ary field content. I will survey different approaches to address the most
pressing challenges and provide examples including axion-inflation models
and the so-called effective theory approach. I will then focus on the key
observables\, starting with primordial gravitational waves\, and discuss t
heir prospects for detection.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kalliopi Petraki (Paris LPTHE and Nikhef\, Amsterdam)
DTSTART:20210215T150000Z
DTEND:20210215T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/34
DESCRIPTION:Title: Dark matter goes nuclear: overhauling thermal decoupling at the TeV
scale with bound states\nby Kalliopi Petraki (Paris LPTHE and Nikhef\
, Amsterdam) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe production
of dark matter via thermal decoupling from the primordial plasma\, and the
direct\, indirect and collider signals associated with this mechanism\, h
ave been the pillars of dark matter phenomenology in the past decades. In
sharp contrast to the sub-TeV regime\, the interactions of thermal-relic d
ark matter with multi-TeV or larger mass manifest as long-range. This is s
upported by unitarity arguments\, and shown by explicit calculations in WI
MP and other models. The long-range nature of the interactions gives rise
to non-perturbative effects\, with the most prominent being the existence
of bound states. The formation and decay of unstable bound states in the e
arly universe decrease the dark matter density\, thereby changing its pred
icted mass and/or couplings. This can have severe implications for all exp
erimental probes\, particularly for collider and indirect searches.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giulia Zanderighi (MPI Munich)
DTSTART:20210218T150000Z
DTEND:20210218T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/35
DESCRIPTION:Title: Precision Physics at the LHC: why and how\nby Giulia Zanderighi
(MPI Munich) as part of IFT-Madrid Webinars\n\n\nAbstract\nMeasurements a
t the LHC have already reached a remarkable precision. This\nopens up new
opportunities for New Physics searches. However\, the accuracy\nof experim
ental data must be matched by the theoretical one. In this talk\, I\nwill
discuss recent progress in precision QCD predictions.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Cerdeno (IFT Madrid)
DTSTART:20210301T150000Z
DTEND:20210301T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/36
DESCRIPTION:Title: Direct detection window to light new physics\nby David Cerdeno
(IFT Madrid) as part of IFT-Madrid Webinars\n\n\nAbstract\nIn order to sea
rch for dark matter with increased sensitivity\, the new\ngeneration of di
rect detection experiments will soon be operational with an\nincreased tar
get size (e.g. LZ with approximately 5 tons of LXe) and lower\nexperimenta
l thresholds (e.g. SuperCDMS in the high-voltage operation mode).\nWhile t
hese features will certainly help further narrowing down the\nparameter sp
ace of weakly-interacting massive particles\, they also offer the\npossibi
lity of probing less canonical candidates for dark matter\, as well as\not
her types of new physics in the neutrino sector. In this talk I will\nrevi
ew the different possibilities that this offers\, including a recent\nexam
ple from 2006.11225\, in which a light mediator in a gauged\nU(1)(L\\mu-L\
\tau) could explain the discrepancy in the muon anomalous\nmagnetic moment
.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cyril Pitrou (Institut d'Astrophysique de Paris)
DTSTART:20210308T150000Z
DTEND:20210308T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/37
DESCRIPTION:Title: Precision big bang nucleosynthesis and the status of deuterium\
nby Cyril Pitrou (Institut d'Astrophysique de Paris) as part of IFT-Madrid
Webinars\n\n\nAbstract\nPrimordial nucleosynthesis or Big-Bang Nucleosynt
hesis (BBN) happens during the first 300 seconds of our Universe. It is on
e of the three evidences for the big-bang model\, together with the cosmol
ogical expansion and the Cosmic Microwave Background (CMB). Now that the n
umber of neutrino families and the baryonic densities have been fixed by l
aboratory measurements or CMB observations\, it has become a parameter fre
e model. Since the most recent measurements of primordial deuterium and He
lium-4 abundances reach the percent level in precision\, it is necessary t
o obtain a similar precision in theoretical predictions. I will review the
basic physics of primordial cosmology and BBN and then review the various
effects which need to be taken into account at that epoch in order to obt
ain such precision. I will also discuss a tension in primordial deuterium
which has emerged following a recent update on one of the key nuclear rate
s.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:J.A. Aguilar Saavedra (U. Granada and IFT Madrid)
DTSTART:20210322T150000Z
DTEND:20210322T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/39
DESCRIPTION:Title: Top-pourri: from current anomalies to future colliders including ma
chine learning\nby J.A. Aguilar Saavedra (U. Granada and IFT Madrid) a
s part of IFT-Madrid Webinars\n\n\nAbstract\nAs an appetizer\, I will poin
t out the current mismatch between\nprecise SM predictions and experimenta
l measurements in top quark\nproduction. I will discuss how future collide
rs may test the top quark at\nthe highest energies\, searching for evidenc
e of new forces in Nature\, or\nsubstructure of this particle\, hitherto c
onsidered pointlike and elementary.\nI will present an example of how mach
ine learning can be of great help in\nthis endeavour.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marina Cermeño (U. Louvain)
DTSTART:20210318T150000Z
DTEND:20210318T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/40
DESCRIPTION:Title: Circular polarisation of gamma rays as a probe of DM-cosmic ray ele
ctron interactions\nby Marina Cermeño (U. Louvain) as part of IFT-Mad
rid Webinars\n\n\nAbstract\nDark Matter (DM) constitutes most of the matte
r in the presently accepted\ncosmological model for our Universe. However\
, despite the increased\nsensitivity of direct and indirect DM searches\,
and the latest LHC run at 13\nTeV centre of mass energy\, no signal from D
M particles has been detected so\nfar\, leading to exclusion limits on the
parameter space of DM models.\nConventional indirect searches look for an
excess in the electromagnetic\nemission from the sky that cannot be attri
buted to known astrophysical\nsources\, but polarisation is so far not bei
ng explored.\n\nIn this talk\, I will argue that the photon polarisation i
s an important\nfeature to understand new physics interactions. In particu
lar\, circular\npolarisation can be generated from Beyond the Standard Mod
el (BSM)\ninteractions if they violate parity and there is an asymmetry in
the number\nof particles which participate in the interaction. I will con
sider a\nsimplified model for fermionic (Majorana) DM and study the circul
arly\npolarised gamma rays below 10 GeV from DM cosmic ray electron intera
ctions.\nI will study the differential flux of positive and negative polar
ised\nphotons from the Galactic Centre and show that the degree of circula
r\npolarization can reach up to 90%. Finally\, I will discuss the detectio
n\nprospects of this signal in future experiments.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andres Perez (IFLP-Buenos Aires)
DTSTART:20210325T150000Z
DTEND:20210325T160000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/41
DESCRIPTION:Title: Hunting Dark Matter Signals at the LHC with neural networks\nby
Andres Perez (IFLP-Buenos Aires) as part of IFT-Madrid Webinars\n\n\nAbst
ract\nWe study several simplified dark matter models and their signatures
at the\nLHC using Neural Networks. We focus on the usual monojet plus miss
ing\ntransverse energy channel\, but to train the algorithms we organize t
he data\nin 2D histograms instead of event-by-event arrays. This results i
n a huge\nperformance boost to distinguish between SM only and SM plus new
physics\nsignals. We found that Neural Network results do not change with
luminosity\,\nif they are shown as a function of S/Sqrt[B]\, where S and
B are the number of\nsignal and background events per histogram\, respecti
vely. To keep a broader\napproach\, we do not specify the simplified model
s coupling values. This\nprovides flexibility to the method\, since testin
g a particular model is\nstraightforward\, only the new physics monojet cr
oss-section is needed.\nFurthermore\, we discuss the performance of the ne
tworks under wrong\nassumptions. Finally\, we propose multimodel classifie
rs to search and\nidentify new signals in a model independent way\, for th
e next LHC run.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Valeria Pettorino (CEA Saclay)
DTSTART:20210329T140000Z
DTEND:20210329T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/42
DESCRIPTION:Title: Dark Energy\, from theory to data\nby Valeria Pettorino (CEA Sa
clay) as part of IFT-Madrid Webinars\n\n\nAbstract\nCosmology is advancing
thanks to contributions from theory\, data\, and methods that link them.
I will discuss recent results I have been working on\, which touch these t
hree aspects. I will in particular discuss: a) coupled dark energy and the
H0 tension\; b) weak lensing statistics as a tool to distinguish differen
t theoretical models\; c) forecasts for the Euclid satellite space mission
\, whose launch is expected in 2022.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andreas Mantziris (Imperial College)
DTSTART:20210408T140000Z
DTEND:20210408T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/43
DESCRIPTION:Title: Cosmological implications of electroweak vacuum instability: constr
aints on the Higgs curvature coupling from inflation\nby Andreas Mantz
iris (Imperial College) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe
current experimentally measured parameters of the Standard Model (SM) sugg
est that our universe lies in a metastable electroweak vacuum\, where the
Higgs field could decay to a lower vacuum state with catastrophic conseque
nces. Our measurements dictate that such an event has not happened yet\, d
espite the many different mechanisms that could have triggered it during o
ur past light-cone. Via this observation\, we can establish a promising li
nk between cosmology and particle physics and thus constrain important par
ameters of our theories. The focus of our work has been to explore this po
ssibility by calculating the probability of the false vacuum to decay duri
ng the period of inflation and using it to constrain the last unknown reno
rmalisable SM parameter $\\xi$\, which couples the Higgs field with space-
time curvature. In our latest study\, we derived lower bounds for the Higg
s-curvature coupling from vacuum stability in three inflationary models: q
uadratic and quartic chaotic inflation\, and Starobinsky-like power-law in
flation. In contrast to most previous studies we took the time-dependence
of the Hubble rate into account both in the geometry of our past light-con
e and in the Higgs effective potential\, which is approximated with three-
loop renormalisation group improvement supplemented with one-loop curvatur
e corrections. We find that in all three models\, the lower bound is $\\xi
\\gtrsim 0.051 ... 0.066$ depending on the top quark mass. We also demons
trated that vacuum decay is most likely to happen a few e-foldings before
the end of inflation.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/43/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theodoros Papanikolaou (APC\, Paris)
DTSTART:20210415T140000Z
DTEND:20210415T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/44
DESCRIPTION:Title: Constraining the early universe with ultralight primordial black ho
les and vice-versa\nby Theodoros Papanikolaou (APC\, Paris) as part of
IFT-Madrid Webinars\n\n\nAbstract\nIn our presentation\, we focus on ultr
alight PBHs\, not tightly constrained in the literature\, produced natural
ly during the preheating instability in the context of single-field inflat
ionary models. In particular\, we find that the PBH production mechanism c
an be so efficient that PBHs subsequently dominate the content of the univ
erse and reheating proceeds from their evaporation. Taking into account ob
servational constraints on the PBH abundance one can constrain the energy
scales at the end of inflation and at the onset of the radiation era. Vice
-versa\, by studying induced second order gravitational waves generated by
density perturbations underlain by PBHs themselves and taking into accoun
t GW back-reaction effects one can set constraints on the initial abundanc
e of PBHs as a function \nof their mass.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/44/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Carlos Arguelles (UNLP\, La Plata)
DTSTART:20210422T140000Z
DTEND:20210422T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/45
DESCRIPTION:Title: Fermionic Dark Matter Profiles\nby Carlos Arguelles (UNLP\, La
Plata) as part of IFT-Madrid Webinars\n\n\nAbstract\nWe discuss the proble
m of dark matter halos\, by assuming a quantum fermionic\nparticle as the
building block for the DM component\, each of which\nself-gravitates in a
quasi-virialized system of collisionless fermions. We\nshow that DM fermio
ns accounting for the Pauli-principle and particle escape\neffects in the
coarse-grained phase-space distribution at relaxation\, can\nlead to a mor
e general density profile which developes a degenerate-core\nsurrounded by
a diluted-halo able to reproduce the galaxy rotation curves.\nInteresting
ly\, such\nvery dense nucleus of dark matter at the center of the DM halo\
, can mimic\nthe effects of a central black hole\, or eventually collapse
to form one. In\nthe case of our Galaxy\, we show that the dense DM core c
an produce similar\ngravitational effects than the putative massive BH cen
tered in SgrA*\, for\nparticle masses m ~ 10 -100 keV. The formation mecha
nism\, stability\, and\nother astrophysical and cosmological consequences
of such novel fermionic\nprofiles will be discussed as well.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Carmelita Carbone (INAF-IASF Milano)
DTSTART:20210419T140000Z
DTEND:20210419T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/46
DESCRIPTION:Title: The imprint of dark energy and neutrinos on cosmic voids\nby Ca
rmelita Carbone (INAF-IASF Milano) as part of IFT-Madrid Webinars\n\n\nAbs
tract\nAfter a brief introduction\, I will show how the largest structures
in the Universe\, the so-called cosmic voids\, are probes sensitive to th
e presence of dynamic dark energy and massive neutrinos. The results prese
nted in this talk have been obtained from the analysis of the "Dark Energy
and Massive Neutrino Universe" simulations\, a set of 16 large N-body sim
ulations conceived to study the combination of different probes in the pre
sence of dark energy (with CPL parametrisation) and massive neutrinos. Thi
s analysis highlights how different statistics\, such as the void size fun
ction\, the void auto-correlation\, and void-CMB cross-correlations can be
able to disentangle the impact of dark energy and massive neutrinos\, and
help to improve the performance of future galaxy surveys in unveiling the
ir nature.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luciano Maiani (Roma La Sapienza)
DTSTART:20210426T140000Z
DTEND:20210426T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/47
DESCRIPTION:Title: The new exotics Zcs(3085)\, Zcs(4003)\, Y(4230) decays and Flavour
SU(3)\nby Luciano Maiani (Roma La Sapienza) as part of IFT-Madrid Webi
nars\n\n\nAbstract\nNew data from BES III and LHCb indicate the existence
of two hidden charm\, open strangeness resonances\, Zcs(3985) and Zcs(4003
). The near degeneracy of Zcs(3985) and Zcs(4003) reproduces\, in the stra
nge sector\, the situation observed with X(3872) and Zc(3900). We show tha
t\, in the tetraquark picture\, the Zcs resonances\, together with X(3872)
\, X(4140) and Zc(3900)\, neatly fit into two nonets of flavour SU(3)\, wi
th JP = 1+ and opposite charge-conjugation. The mass of the missing eleme
nt of the nonets is predicted. \nIn the same framework\, we have made a st
udy of the decays of Y(4230) observed by BES III in e+e- annihilation. Res
ults are compared with the well studied decays D∗ → D π decays\, obta
ining consistent results for the quark-pion coupling. We extend the discus
sion to the decay B -> K phi J/Psi where the signal of Zcs(4003) has been
observed by LHCb.\n These results represent a significative score in favo
ur of the tetraquark model. We discuss briefly further steps necessary to
clarify the nature of the exotic states under study.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/47/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gilberto Colangelo (University of Bern)
DTSTART:20210510T140000Z
DTEND:20210510T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/48
DESCRIPTION:Title: The muon g-2 in the standard model: a review of the calculation of
hadronic contributions\nby Gilberto Colangelo (University of Bern) as
part of IFT-Madrid Webinars\n\n\nAbstract\nIn this talk I will review the
status of the standard model calculation of the muon g-2. After a brief di
scussion of the QED and EW contributions I will concentrate on the hadroni
c ones\, which are responsible for most of the final theoretical uncertain
ties. I will start with the hadronic vacuum polarization (HVP) first as ca
lculated with a dispersive\, data-driven approach\, and then on the lattic
e\, concentrating in particular on the result by the BMW collaboration. I
will then discuss the hadronic light-by-light (HLbL) contribution\, which
has recently also become amenable to a dispersive\, data-driven approach.
Also this contribution can be calculated on the lattice and recently two c
ollaborations have presented their results\, which I will also briefly dis
cuss. I will conclude with an outlook on possible future improvements in t
he calculation of these hadronic contributions.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/48/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xavier Marcano (Orsay\, LPT)
DTSTART:20210513T140000Z
DTEND:20210513T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/49
DESCRIPTION:Title: Massive sterile neutrinos in single and double beta decays\nby
Xavier Marcano (Orsay\, LPT) as part of IFT-Madrid Webinars\n\n\nAbstract\
nNuclear beta and double beta decay experiments are intensively exploring
the neutrino parameter space. In this talk\, we will see how these experim
ents could through light not only to the active neutrino sector\, but also
to the sterile one. During the first part\, we will revisit the potential
of single beta decay experiment to search for keV sterile neutrinos\, hig
hlighting its complementarity with neutrinoless double beta decay searches
. In the second part\, we will discuss a new method to search for sterile
neutrinos in the two neutrino double beta decay process\, which could prob
e the MeV mass hypothesis beyond current limits.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/49/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robert Reischke (Astronomisches Institut\, Ruhr-Universität Bochu
m)
DTSTART:20210517T140000Z
DTEND:20210517T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/50
DESCRIPTION:Title: Consistent equivalence principle tests with fast radio bursts\n
by Robert Reischke (Astronomisches Institut\, Ruhr-Universität Bochum) as
part of IFT-Madrid Webinars\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/50/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Louis Perenon (U. Western Cape)
DTSTART:20210520T140000Z
DTEND:20210520T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/51
DESCRIPTION:Title: Multi-tasking the growth of cosmological structures\nby Louis P
erenon (U. Western Cape) as part of IFT-Madrid Webinars\n\n\nAbstract\nNex
t-generation large-scale structure surveys will deliver a significant incr
ease in the precision of growth data\, allowing us to use `agnostic' metho
ds to study the evolution of perturbations without the assumption of a cos
mological model. We focus on a particular machine learning tool\, Gaussian
processes\, to reconstruct the growth rate f\, the root mean square of ma
tter fluctuations \\sigma_8\, and their product f\\sigma_8. We apply this
method to simulated data\, representing the precision of upcoming Stage IV
galaxy surveys. We extend the standard single-task approach to a multi-ta
sk approach that reconstructs the three functions simultaneously\, thereby
taking into account their inter-dependence. We find that this multi-task
approach outperforms the single-task approach for future surveys and will
allow us to detect departures from the standard model with higher signific
ance. By contrast\, the limited sensitivity of current data severely hinde
rs the use of agnostic methods\, since the Gaussian processes parameters n
eed to be fine tuned in order to obtain robust reconstructions.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/51/
END:VEVENT
BEGIN:VEVENT
SUMMARY:O. Macias Ramirez (GRAPPA. Amsterdam)
DTSTART:20210527T140000Z
DTEND:20210527T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/52
DESCRIPTION:Title: Searching for evidence of TeV-scale electron/positron acceleration
by Millisecond Pulsars\nby O. Macias Ramirez (GRAPPA. Amsterdam) as pa
rt of IFT-Madrid Webinars\n\n\nAbstract\nPulsars have long been predicted
to be sources of electron/positron (e-e+) pairs. Highly energetic e-e+ in
the wind regions\, or inner magnetospheres of pulsars\, and also when rele
ased into the interstellar medium\, can inverse-Compton IC) scatter ambien
t photons to very high energies. Recent HAWC observations of extended TeV-
scale gamma-ray emission around Geminga and Monogem have provided indirect
evidence for multi-TeV e-e+ acceleration in young pulsar nebulae. However
\, predicting and observing very-high-energy gamma-ray emission from rotat
ion-powered millisecond pulsars (MSPs) presents a number of challenges com
pared to that of the non-recycled pulsar population. During this talk\, I
will summarize these challenges\, and present our recent exciting results
where we find evidence for very-high-energy gamma ray emission from popula
tions of MSPs residing in globular clusters of the Milky Way. I will furth
er highlight the unique capabilities of the Cherenkov Telescope Array to d
etect the expected IC signal from a putative population of 10 to 50 thousa
nd MSPs in the center of our Galaxy.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/52/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Angeles Moline (IFT Madrid)
DTSTART:20210607T140000Z
DTEND:20210607T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/53
DESCRIPTION:Title: The impact of halo and subhalo properties on dark matter searches\nby Angeles Moline (IFT Madrid) as part of IFT-Madrid Webinars\n\n\nAbs
tract\nCosmological observations and cold dark matter N-body simulations i
ndicate that our Universe is populated by numerous halos\, where dark matt
er particles annihilate\, potentially producing Standard Model particles.
Indeed\, one of the most active lines of research in dark matter physics i
s that of indirect searches of such dark matter annihilation products (gam
ma-rays\, neutrinos and antimatter) in different astrophysical regions. In
this talk\, I will focus on the impact of different predictions of struct
ure formation in such dark matter searches.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/53/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wolfgang Altmannshofer (U. C. Santa Cruz)
DTSTART:20210524T140000Z
DTEND:20210524T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/54
DESCRIPTION:Title: The state of B anomalies\nby Wolfgang Altmannshofer (U. C. Sant
a Cruz) as part of IFT-Madrid Webinars\n\n\nAbstract\nFor several years\,
various experimental results on B meson decays show persistent discrepanci
es with respect to Standard Model expectations. Discrepancies are observed
in branching ratios\, angular distributions\, and lepton flavor universal
ity ratios. I will review the status of those discrepancies\, discuss poss
ible new physics explanations\, and outline the prospects of resolving the
m with expected experimental data.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/54/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Noriyuki Sogabe (Institute of Modern Physics\, Lanzhou\, China)
DTSTART:20210610T080000Z
DTEND:20210610T090000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/55
DESCRIPTION:Title: Positive magnetoresistance induced by hydrodynamic fluctuations in
chiral media\nby Noriyuki Sogabe (Institute of Modern Physics\, Lanzho
u\, China) as part of IFT-Madrid Webinars\n\n\nAbstract\nWe analyze the co
mbined effects of hydrodynamic fluctuations and chiral magnetic effect (CM
E) for a chiral medium in the presence of a background magnetic field. Bas
ed on the recently developed non-equilibrium effective field theory\, we s
how fluctuations give rise to a CME-related positive contribution to magne
toresistance\, while the early studies without accounting for the fluctuat
ions find a CME-related negative magnetoresistance. At zero axial relaxati
on rate\, the fluctuations contribute to the transverse conductivity in ad
dition to the longitudinal one.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/55/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Manuel Szewc (ICAS (Buenos Aires))
DTSTART:20210617T140000Z
DTEND:20210617T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/56
DESCRIPTION:Title: Bayesian Inference for Four Tops at the LHC\nby Manuel Szewc (I
CAS (Buenos Aires)) as part of IFT-Madrid Webinars\n\n\nAbstract\nFour top
production is one of the last benchmarks of the SM\nexplored at the LHC\,
and thus the intersection of state of the art\nexperimental techniques an
d theoretical calculations. In this talk\, we give\na brief review of the
main problems one faces when trying to disentangle\nsignal from background
in such a complex final state. We then propose a\nrelatively simple proba
bilistic mixture model where the Monte Carlo\nsimulations play the role of
prior knowledge. Using a simulated dataset with\n"bad" priors and known n
umerical inference techniques\, we are able to\ncorrect the initial modell
ing on the data to a certain degree. This in turn\nopens the door for a re
duction of simulation systematics and a higher\nsensitivity to possible BS
M effects.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/56/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tevong You (CERN)
DTSTART:20210722T140000Z
DTEND:20210722T150000Z
DTSTAMP:20260404T094148Z
UID:IFTWeb/57
DESCRIPTION:Title: Self-Organised Localization\nby Tevong You (CERN) as part of IF
T-Madrid Webinars\n\n\nAbstract\nWe describe a new phenomenon in quantum c
osmology: self-organised localisation. When the fundamental parameters of
a theory are functions of a scalar field subject to large fluctuations dur
ing inflation\, quantum phase transitions can act as dynamical attractors.
As a result\, the theory parameters are probabilistically localised aroun
d the critical value and the Universe finds itself at the edge of a phase
transition. We illustrate how self-organised localisation could account fo
r the observed near-criticality of the Higgs self-coupling\, the naturalne
ss of the Higgs mass\, or the smallness of the cosmological constant.\n
LOCATION:https://stable.researchseminars.org/talk/IFTWeb/57/
END:VEVENT
END:VCALENDAR