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BEGIN:VEVENT
SUMMARY:Gordon Semenoff (University of British Columbia)
DTSTART:20200612T163000Z
DTEND:20200612T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/1
DESCRIPTION:Title: Entanglement and the Infrared\nby Gordon Semenoff (University of
British Columbia) as part of Carnegie Mellon theoretical physics\n\nAbstr
act: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Angelo Esposito (EPFL)
DTSTART:20200619T163000Z
DTEND:20200619T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/2
DESCRIPTION:Title: An effective field theory for acoustic and pseudo-acoustic phonons i
n solids\nby Angelo Esposito (EPFL) as part of Carnegie Mellon theoret
ical physics\n\n\nAbstract\nSolids generally feature many phonon branches\
, with different dispersion relations. Gapless acoustic phonons are known
to be the Goldstone bosons of the spontaneous breaking of spacetime symmet
ries associated to the solid phase. Other gapped phonons are generally non
-universal degrees of freedom\, which depend on the microscopic details of
the solid. In this talk I will show that some of these gapped phonons can
actually be seen as pseudo-Goldstones associated to some small explicit b
reaking. In this regime it is possible to include them in a low-energy EFT
\, together with the gapless phonons. I will explicitly construct such an
EFT for the case of one and two spatial dimensions\, two ‘flavors’ and
in the isotropic limit. I will then compute some test observables and sho
w that they match what already known (when available).\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luca Delacretaz (University of Chicago)
DTSTART:20200710T163000Z
DTEND:20200710T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/3
DESCRIPTION:Title: Heavy operators and hydrodynamic tails\nby Luca Delacretaz (Univ
ersity of Chicago) as part of Carnegie Mellon theoretical physics\n\n\nAbs
tract\nThe late time physics of interacting QFTs at finite temperature is
controlled by hydrodynamics. For CFTs this implies that heavy operators --
which are generically expected to create thermal states -- can be studied
semiclassically. We show that hydrodynamics universally fixes the OPE coe
fficients C_{HH'L}\, on average\, of all neutral light operators with two
non-identical heavy ones\, as a function of the scaling dimension and spin
of the operators. These methods can be straightforwardly extended to CFTs
with global symmetries\, and generalize recent EFT results on large charg
e operators away from the case of minimal dimension at fixed charge. We al
so revisit certain aspects of late time thermal correlators in QFT and oth
er diffusive systems.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Graham White (TRIUMF)
DTSTART:20200724T160000Z
DTEND:20200724T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/4
DESCRIPTION:Title: BBN and CMB bounds on hidden sector vectors\nby Graham White (TR
IUMF) as part of Carnegie Mellon theoretical physics\n\n\nAbstract\nNew da
rk vector bosons that couple very feebly to regular matter can be produced
\nin the early universe and decay after the onset of Big Bang Nucleosynthe
sis (BBN)\nor the formation of the cosmic microwave background (CMB) at re
combination. The\nenergy injected by such decays can modify the light elem
ent abundances or modify\nthe power and frequency spectra of the CMB. In t
his work we study the constraints\nimplied by these considerations on a ra
nge of sub-GeV dark vectors including the\nkinetically mixed dark photon\,
as well as gauge B-L and lepton families. We focus on the \neffects of el
ectromagnetic energy injection\, and we update\nprevious investigations of
the dark photon by taking into account non-universality\nin the photon ca
scade spectrum relevant for BBN and the energy dependence of the\nionizati
on efficiency after recombination in our treatment of modifications to the
CMB.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nabil Iqbal (Durham University)
DTSTART:20200807T160000Z
DTEND:20200807T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/5
DESCRIPTION:Title: From generalized global symmetries to pulsar magnetospheres\nby
Nabil Iqbal (Durham University) as part of Carnegie Mellon theoretical phy
sics\n\n\nAbstract\nCertain quantum field theories possess generalized glo
bal symmetries\; just as ordinary global symmetries enforce the conversati
on of particle number\, generalized global symmetries enforce the conserva
tion of extended objects\, such as strings. I will review this symmetry pr
inciple and argue that it governs the long-distance physics of conventiona
l 4d electromagnetism\, where the strings in question are magnetic field l
ines. I will then apply it to construct a novel effective theory for the d
escription of strongly magnetized plasmas. One potential application of th
is new effective theory is to astrophysical pulsars\, which are thought to
be surrounded by strong magnetic fields as well as a high density of char
ged particles\; the resulting zero temperature system is highly nonlinear.
At leading order in derivatives our new effective theory agrees with the
standard treatment in terms of ``force-free electrodynamics''. The inclusi
on of higher derivative terms however generically results in new and poten
tially observationally relevant effects\, such as electric fields that acc
elerate charges to high energies along magnetic field lines.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Landry (Columbia University)
DTSTART:20200717T150000Z
DTEND:20200717T160000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/6
DESCRIPTION:Title: The coset construction for non-equilibrium systems\nby Michael L
andry (Columbia University) as part of Carnegie Mellon theoretical physics
\n\n\nAbstract\nWe propose a systematic coset construction of non-equilibr
ium effective field theories (EFTs) governing the long-distance and late-
time dynamics of relativistic\, finite-temperature condensed matter syste
ms. Our non-equilibrium coset construction makes significant advances beyo
nd more standard coset constructions in that it takes advantage of recentl
y-developed techniques\, which allow the formulation of non-equilibrium e
ffective actions that account for quantum and thermal fluctuations as well
as dissipation. Because these systems exist at finite temperature\, the
EFTs live on the closed-time-path of the Schwinger-Keldysh contour. To dem
onstrate the legitimacy of this coset construction\, we successfully repro
duce the known EFTs for fluids and superfluids at finite temperature. Then
\, (time permitting) to demonstrate its utility\, we construct novel EFTs
for solids\, supersolids\, and four phases of liquid crystals\, all at fin
ite temperature. We thereby combine the non-equilibrium effective action
and the coset construction to create a powerful tool that can be used to s
tudy many-body systems out of thermal equilibrium.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Carl Rodriguez (Carnegie Mellon University)
DTSTART:20200731T160000Z
DTEND:20200731T163000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/7
DESCRIPTION:Title: Modeling Dense Star Clusters and the gravitational waves they create
\nby Carl Rodriguez (Carnegie Mellon University) as part of Carnegie M
ellon theoretical physics\n\n\nAbstract\nThe lives of massive star cluster
s are inevitably linked to the assembly and evolution of the galaxies they
inhabit. While significant progress has been made over the past several d
ecades at separately modeling both galaxy formation and the dynamics of co
llisional star clusters\, the connection between the two remains poorly un
derstood. In this talk\, I will describe how we model dense star clusters\
, both analytically and numerically\, and what motivates our typical choic
es of initial conditions. I will then describe a recent project to model c
lusters self-consistently from collapsing giant molecular clouds in an MHD
simulation of a Milky Way-sized galaxy. Finally\, I will connect these re
sults to the binary black holes formed by isolated binaries and dense star
clusters\, including GW190412\, a recently announced binary merger with u
nique masses and spins.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrey Gromov (Brown University)
DTSTART:20201030T170000Z
DTEND:20201030T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/8
DESCRIPTION:Title: Fractons and vortices\nby Andrey Gromov (Brown University) as pa
rt of Carnegie Mellon theoretical physics\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jyoti Katoch (Carnegie Mellon University)
DTSTART:20201002T170000Z
DTEND:20201002T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/9
DESCRIPTION:Title: Probing two-dimensional materials using focused angle-resolved photo
emission spectroscopy\nby Jyoti Katoch (Carnegie Mellon University) as
part of Carnegie Mellon theoretical physics\n\n\nAbstract\nTwo-dimensiona
l (2D) materials offer the freedom to create novel condensed matter system
s\, with unique properties\, by mechanically assembling different (or same
) 2D materials layer-by-layer to form atomically sharp vertical or lateral
heterostructures. The van der Waals (vdW) heterostructures with small lat
tice mismatch and a relatively small twist angle between the constituent l
ayers\, have shown to exhibit coexisting complex phases of matter includin
g Mott insulating state\, superconductivity\, bound quasiparticles\, and t
opological states. In addition\, the extreme surface sensitivity of two-di
mensional (2D) materials provides an unprecedented opportunity to engineer
the physical properties of these materials using external perturbations.
In this talk\, I will discuss the utilization of angle-resolved photoemiss
ion spectroscopy (ARPES) with high spatial resolution to investigate the e
lectronic band structure of 2D heterostructures and their devices. This ca
n shed light on the intricate relationship between controlled external per
turbations\, substrate\, and electronic properties of 2D materials [1\, 2]
. In particular\, I will discuss our in-operando nanoARPES results that ex
hibit highly tunable many-body effects in graphene devices [3] and tunable
van Hove singularities in twisted bilayer graphene [4]. \n\nReferences:\n
[1] Katoch et. al.\, Nature Physics 14\, 355-359 (2018).\n[2] Ulstrup\, et
. al.\, Science Advances\, Vol. 6\, no. 14\, eaay6104\, (2020).\n[3] Muzzi
o\, et. al.\, Physical review B Rapid Communications 101\, 201409(R) (2020
).\n[4] Jones\, et. al.\, Adv. Mater. 2020\, 32\, 2001656.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Pretko (University of Colorado)
DTSTART:20200814T160000Z
DTEND:20200814T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/10
DESCRIPTION:Title: Fractons: A New Type of Particle\nby Michael Pretko (University
of Colorado) as part of Carnegie Mellon theoretical physics\n\n\nAbstract
\nA fracton is an unusual new type of emergent quasiparticle found in vari
ous condensed matter systems. Fractons are characterized by a set of mobi
lity restrictions\, which force isolated fractons to be strictly immobile\
, while certain bound states of fractons remain free to move. This behavi
or leads to a variety of unusual phenomenology\, such as non-ergodic and g
ravitational behavior\, and may lead to advances in quantum memory storage
. In this talk\, I will give a broad overview of the field of fractons\,
including both introductory material and recent advances. I will describe
the basics of the theoretical formalism for fractons in terms of tensor g
auge theories and higher moment conservation laws. I will then discuss va
rious physical realizations of fractons\, such as spin models and topologi
cal lattice defects\, along with the unusual phenomenology exhibited by fr
actons. I will conclude by outlining some open questions in the field.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tim Cohen (University of Oregon)
DTSTART:20201009T170000Z
DTEND:20201009T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/11
DESCRIPTION:Title: Soft de Sitter Effective Theory\nby Tim Cohen (University of Or
egon) as part of Carnegie Mellon theoretical physics\n\n\nAbstract\nIn thi
s talk\, I will introduce the Soft de Sitter Effective Theory (SdSET)\, wh
ose purpose is to model the long wavelength dynamics of quantum fluctuatio
ns beyond the horizon. After providing some conceptual and technical issu
es that motivate the need for a new EFT approach\, I will explain how we i
dentify the propagating low energy degrees of freedom\, along with their s
caling under a power counting scheme and their transformation properties u
nder the symmetries that persist to the IR. I will sketch how to derive t
he SdSET action\, and will argue that it can be expressed as an expansion
in local operators\, augmented by stochastic initial conditions. Finally\
, I will show how this framework can be applied to a number of physically
interesting problems: massive scalar fields in dS\, light scalar fields an
d stochastic inflation\, conservation of the inflationary adiabatic modes\
, and the phase transition to eternal inflation.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Claudia de Rham (Imperial College)
DTSTART:20200918T170000Z
DTEND:20200918T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/12
DESCRIPTION:Title: Causality and Positivity with Gravity\nby Claudia de Rham (Impe
rial College) as part of Carnegie Mellon theoretical physics\n\n\nAbstract
\nI will investigate the propagation of gravitational waves on curved spac
etimes within the low energy effective field theory of gravity\, where eff
ects from heavy fields are captured by higher dimensional curvature operat
ors. Depending on the spin of the particles integrated out\, the speed of
gravitational waves at low energy can be either superluminal or subluminal
as compared to the causal structure observed by other species. I will cla
rify why a mild level of superluminality is not in contradiction with caus
ality\, analyticity or Lorentz invariance and show how consistent gravitat
ional low energy effective theories can self-protect by ensuring that any
time advance and superluminality calculated within the regime of validity
of the effective theory is necessarily unresolvable for such theories. The
se considerations are particularly relevant for putting constraints on cos
mological and gravitational effective field theories and I will provide ex
plicit criteria to be satisfied so as to ensure causality.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexandre Le Tiec (Observatoire de Paris)
DTSTART:20200925T170000Z
DTEND:20200925T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/14
DESCRIPTION:Title: Tidal Love numbers of Kerr black holes\nby Alexandre Le Tiec (O
bservatoire de Paris) as part of Carnegie Mellon theoretical physics\n\n\n
Abstract\nThe open question of whether a black hole can become tidally def
ormed by an external gravitational field has profound implications for fun
damental physics\, astrophysics and gravitational-wave astronomy. Love num
bers characterize the tidal deformability of compact objects such as astro
physical (Kerr) black holes. We prove that all Love numbers vanish identic
ally for a Kerr black hole in the nonspinning limit or for an axisymmetric
tidal perturbation. In contrast to this result\, we show that Love number
s are generically nonzero for a spinning black hole. Specifically\, to lin
ear order in the black hole spin and the weak perturbing tidal field\, we
compute in closed form the Love numbers that couple the mass-type and curr
ent-type quadrupole moments to the electric-type and magnetic-type quadrup
olar tidal fields. This tidal deformability is potentially observationally
important through its contribution to the accumulated gravitational-wave
phase of an inspiralling stellar-mass compact object into a massive black
hole. We show that for a dimensionless black hole spin ~ 0.1\, the nonvani
shing quadrupolar Love numbers are ~ 0.002. This indicates that\, despite
black holes being particularly "rigid" compact objects\, their nonvanishin
g tidal deformability could be detected by the future gravitational-wave i
nterferometer LISA.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eric Poisson (University of Guelph)
DTSTART:20201016T170000Z
DTEND:20201016T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/15
DESCRIPTION:Title: Love tensor of a slowly rotating body\nby Eric Poisson (Univers
ity of Guelph) as part of Carnegie Mellon theoretical physics\n\n\nAbstrac
t\nA rotating body immersed in a gravitomagnetic tidal field is subjected
to a Lorentz-like force $v \\times B$\, where $v$ is the rotational veloci
ty\, and $B$ is the gravitomagnetic field\, which is produced by mass curr
ents associated with the companion’s orbital motion. The body’s respon
se to this force can be described in terms of a tidal polarizability. In t
his talk I describe a post-Newtonian theory of this tidal polarizability\,
which takes the form of a Love tensor\, a four-index object that relates
the body's current quadrupole moment $S_{jk}$ to the gravitomagnetic tidal
moment $B_{jk}$. The tensorial nature of this quantity has to do with the
fact that each $e^{i m \\phi}$ piece of the tidal force gives rise to an
m-specific velocity perturbation\, and therefore to a tidal polarizability
that depends on m. The collection of these m-specific Love numbers makes
up the Love tensor.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pavel Kovtun (University of Victoria)
DTSTART:20201023T170000Z
DTEND:20201023T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/16
DESCRIPTION:Title: Pushing the limits of hydrodynamics\nby Pavel Kovtun (Universit
y of Victoria) as part of Carnegie Mellon theoretical physics\n\n\nAbstrac
t\nHydrodynamics is a well-established field with a venerable history. In
this talk\, I will focus on foundational aspect of hydrodynamics which cam
e to light in recent years. Do the equations of hydrodynamics even make se
nse? To what degree can the crudeness of hydrodynamics be improved? What a
bout the phenomena that hydrodynamics should describe but fails to? And ho
w universal is it really?\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jim Halverson (Northeastern University)
DTSTART:20200904T133000Z
DTEND:20200904T143000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/17
DESCRIPTION:Title: Neural Networks and Quantum Field Theory\nby Jim Halverson (Nor
theastern University) as part of Carnegie Mellon theoretical physics\n\n\n
Abstract\nWe propose a theoretical understanding of neural networks in ter
ms of Wilsonian effective field theory. The correspondence relies on the f
act that many asymptotic neural networks are drawn from Gaussian processes
\, the analog of non-interacting field theories. Moving away from the asym
ptotic limit yields a non-Gaussian process and corresponds to turning on p
article interactions\, allowing for the computation of correlation functio
ns of neural network outputs with Feynman diagrams. Minimal non-Gaussian p
rocess likelihoods are determined by the most relevant non-Gaussian terms\
, according to the flow in their coefficients induced by the Wilsonian ren
ormalization group. This yields a direct connection between overparameteri
zation and simplicity of neural network likelihoods. Whether the coefficie
nts are constants or functions may be understood in terms of GP limit symm
etries\, as expected from 't Hooft's technical naturalness. General theore
tical calculations are matched to neural network experiments in the simple
st class of models allowing the correspondence. Our formalism is valid for
any of the many architectures that becomes a GP in an asymptotic limit\,
a property preserved under certain types of training.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tina Kahniashvili (Carnegie Mellon University)
DTSTART:20201104T170000Z
DTEND:20201104T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/18
DESCRIPTION:Title: Circular polarization of gravitational waves from the early-univers
e turbulent sources\nby Tina Kahniashvili (Carnegie Mellon University)
as part of Carnegie Mellon theoretical physics\n\n\nAbstract\nI will pres
ent direct numerical simulations to compute the net circular polarization
of gravitational waves from helical (chiral) turbulent sources in the earl
y universe for a variety of initial conditions. I will discuss the resulti
ng gravitational wave signal assuming different turbulence genesis such a
s magnetically or kinetically dominant cases. Under realistic physical con
ditions in the early universe we have computed numerically for the first t
ime the total (integrated over all wavenumbers) polarization degree of the
gravitational waves and its spectral distribution. Our major finding cons
ists of the spectral polarization degree that strongly depends on the init
ial conditions. The peak of the spectral polarization degree occurs (in th
e wavenumber space) at twice the typical wavenumber \nof the source\, as e
xpected\, and for the fully helical decaying turbulence\, reaches its maxi
mum (100\\%) only at the peak. In addition\, we have determined the tempor
al evolution of the turbulent sources as well as the resulting gravitation
al waves\, showing that the dominant contribution to the spectral energy d
ensity happens shortly after the source activation and through artificiall
y prolonged (slow decay) turbulence the increase of the gravitational wave
amplitude at low frequencies can be achieved. Finally\, I will address th
e detection prospects for the net polarization arguing that its detection
contains clean information (including the generation mechanisms\, time\, a
nd strength) about the sources of possible parity violations in the early
universe.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tanguy Grall (DAMTP\, University of Cambridge)
DTSTART:20201204T180000Z
DTEND:20201204T190000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/19
DESCRIPTION:Title: Symmetries and unitarity of theories with spontaneously broken boos
ts\nby Tanguy Grall (DAMTP\, University of Cambridge) as part of Carne
gie Mellon theoretical physics\n\n\nAbstract\nSystems with spontaneously b
roken Lorentz boosts are found everywhere in nature\, from condensed matte
r to the early universe. In this talk I will discuss Effective Field Theor
ies (EFTs) of a single\, shift-symmetric\, phonon that parametrises the br
eaking of time translations and Lorentz boosts. Such theories include for
instance scalar modes in the EFT of inflation\, superfluid or galileid pho
nons (the broken phase of Galileon scalar EFTs).\n\nIn the first part\, I
will present an algebraic classification of such theories\, based on their
non-linearly realised symmetries\, in direct analogy with previous classi
fications of so-called Exceptional (Lorentz invariant) EFTs. In doing so I
will present\, for instance\, a new galileid theory\, “the extended gal
ileid”\, as well as other better known superfluid and galileid theories.
\n\nIn the second part\, I will discuss perturbative unitarity of such the
ories\, making use of the unbroken symmetries of 2-to-2 scattering amplitu
des. A common feature of non-Lorentz invariant EFTs is that they have a cu
t-off not only in energy but also in momentum. I will show how this arises
in our EFTs and derive partial-wave bounds that can be used to probe thei
r strong coupling regime. As a practical application\, I will discuss the
implications of these results on the EFT of inflation in the sub-horizon r
egion.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jingping Li (Yale University)
DTSTART:20201113T180000Z
DTEND:20201113T190000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/20
DESCRIPTION:Title: Gravitational Radiation from the Double Copy\nby Jingping Li (Y
ale University) as part of Carnegie Mellon theoretical physics\n\n\nAbstra
ct\nWe show that the perturbative radiative solutions to the classical Yan
g-Mills equations from the scattering of spinning particle sources exhibit
color-kinematic duality\, a duality originally discovered in the context
of perturbative tree-level scattering amplitudes of Yang-Mills theory. Thi
s enables a classical double-copy construction that generates correspondin
g classical solutions in string gravity (axion-dilaton gravity). While the
original double copy of scattering amplitudes traces back to results in p
erturbative string theories\, we find that classical open and closed strin
gs are possible “UV completions” to these worldline effective field th
eories of the sources by comparing to the low energy radiation from these
rotating strings. Moreover\, we show that the higher dimensional operators
encoding tidal deformation can also be added to this construction\, provi
ded that the Wilson coefficients of the dilatonic and axionic operators ar
e fixed with respect to the gravitational ones.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vicharit Yingcharoenrat (SISSA)
DTSTART:20201209T170000Z
DTEND:20201209T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/21
DESCRIPTION:Title: Beyond perturbation theory in inflation\nby Vicharit Yingcharoe
nrat (SISSA) as part of Carnegie Mellon theoretical physics\n\n\nAbstract\
nIn this talk I will first discuss a motivation why one needs to go beyond
perturbation theory (PT) in inflation as going to the tail of the distrib
ution of the primordial fluctuations. Then I will propose that the way to
go beyond PT is equivalent to performing a calculation in the semi-classic
al limit. As an analogy\, I will show a simple calculation of the ground-s
tate wavefunction in the semi-classical limit for a quantum mechanical sys
tem. After that\, I will move to a toy model of inflation which for simpli
city involves only derivative couplings. As a result\, the wavefunction of
the Universe in this semi-classical limit exhibits a non-perturbative beh
aviour for large coupling limit.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Enrico Pajer (Cambridge University)
DTSTART:20210407T160000Z
DTEND:20210407T170000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/22
DESCRIPTION:Title: A timeless History of Time\nby Enrico Pajer (Cambridge Universi
ty) as part of Carnegie Mellon theoretical physics\n\n\nAbstract\nWe have
overwhelming evidence that the distribution of everything on very large sc
ales is of primorial origin. According to the leading paradigm of inflatio
n\, the statistics of these primordial perturbations can be traced back to
correlators of quantum fields on a curved quasi-de Sitter spacetime. This
gives us the unique opportunity to probe the fundamental laws of physics
at very high energies as well as the perturbative regime of quantum gravit
y.\nUnfortunately\, due to the creativity of theorists and the paucity of
data about the primordial universe\, there is a huge number of models comp
atible with all measurements\, featuring a wide variety of mechanisms\, sy
mmetries\, and spectra of particles.The reason can be traced back to the f
act that we don't observe the time evolution during inflation\, but only i
ts final outcome.\nIn this talk I will report on the recent progress in de
veloping a completely new "bootstrap" approach to derive predictions from
the very early universe that make no reference to time and the un-observab
le time evolution. The bootstrap approach builds directly upon the fundame
ntal pillars of physics\, namely unitarity\, locality and symmetries and i
s highly model independent. I will show how these principles can be used t
o derive many classical and new inflationary predictions associated with p
rimordial non-Gaussianity in a way that is both computationally simpler an
d conceptually more transparent.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ratindranath Akhoury (University of Michigan)
DTSTART:20210210T170000Z
DTEND:20210210T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/23
DESCRIPTION:Title: Entanglement\, renormalization and effective field theories\nby
Ratindranath Akhoury (University of Michigan) as part of Carnegie Mellon
theoretical physics\n\n\nAbstract\nWe develop the idea that renormalizatio
n\, decoupling of heavy particle effects from low energy physics and the c
onstruction of effective field theories are intimately linked to the momen
tum space entanglement of disparate modes of an interacting quantum field
theory. Using unitary transformations to decouple these modes at the pertu
rbative level\, we show in a scalar field theoretical model with light and
heavy fields\, how renormalization may be consistently implemented and ho
w the low energy effective field theory can be constructed. We also obtain
a renormalization group equation in this framework and apply it to the sc
alar field theoretical model.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Csaba Csaki (Cornell University)
DTSTART:20210217T170000Z
DTEND:20210217T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/24
DESCRIPTION:Title: Magnetic scattering: pairwise little group and pairwise helicity\nby Csaba Csaki (Cornell University) as part of Carnegie Mellon theoreti
cal physics\n\n\nAbstract\nI discuss how to construct a Lorentz-invariant
S-matrix for the scattering of electrically and magnetically charged parti
cles. A key ingredient is a revision of our fundamental understanding of m
ulti-particle representations of the Poincaré group. Surprisingly\, the a
symptotic states for electric-magnetic scattering transform with an additi
onal little group phase\, associated with pairs of electrically and magnet
ically charged particles. I will discuss the general construction of such
states. The resulting "pairwise helicity" is identified with the quantized
"cross product" of charges e1 g2- e2 g1 for every charge-monopole pair\,
and represents the extra angular momentum stored in the asymptotic electr
omagnetic field. We define a new kind of pairwise spinor-helicity variable
\, which serves as an additional building block for electric-magnetic scat
tering amplitudes. We then construct the most general 3-point S-matrix ele
ments\, as well as the full partial wave decomposition for the 2 -> 2 ferm
ion-monopole S-matrix. In particular\, we derive the famous helicity flip
in the lowest partial wave as a simple consequence of a generalized spin-h
elicity selection rule\, as well as the full angular dependence for the hi
gher partial waves. Our construction provides a significant new achievemen
t for the on-shell program\, succeeding where the Lagrangian description h
as so far failed.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christopher White (Queen Mary University)
DTSTART:20210303T170000Z
DTEND:20210303T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/25
DESCRIPTION:Title: The classical double copy from twistor space\nby Christopher Wh
ite (Queen Mary University) as part of Carnegie Mellon theoretical physics
\n\n\nAbstract\nThe "double copy” is an intriguing and recently discover
ed relationship between quantities in gauge theories and gravity. It has b
een applied to (quantum) scattering amplitudes as well as classical soluti
ons\, including those relevant for gravitational wave experiments. In some
cases\, we can even relate exact solutions in different theories\, althou
gh why this works has remained mysterious. In this talk\, I will show that
certain exact double copies can be derived using well-established ideas f
rom twistor theory\, which also proves that they are more general than pre
viously thought. No previous knowledge of twistors will be assumed.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sean Carroll (Caltech)
DTSTART:20210203T170000Z
DTEND:20210203T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/26
DESCRIPTION:Title: Extracting the Universe from the Wave Function\nby Sean Carroll
(Caltech) as part of Carnegie Mellon theoretical physics\n\n\nAbstract\nQ
uantum mechanics is a theory of wave functions in Hilbert space. Many feat
ures that we generally take for granted when we use quantum mechanics -- c
lassical spacetime\, locality\, the system/environment split\, collapse/br
anching\, preferred observables\, the Born rule for probabilities -- shoul
d in principle be derivable from the basic ingredients of the quantum stat
e and the Hamiltonian. I will discuss recent progress on these problems\,
including consequences for cosmology and quantum gravity.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Riccardo Rattazzi (EPFL)
DTSTART:20210428T153000Z
DTEND:20210428T163000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/27
DESCRIPTION:Title: The quantum mechanics of a perfect fluid\nby Riccardo Rattazzi
(EPFL) as part of Carnegie Mellon theoretical physics\n\n\nAbstract\nFinit
e density systems can be described by effective field theories with non-li
nearly realized space-time symmetries\,\nwhose construction resembles that
of the QCD chiral lagrangian. Also based on that similarity\, one would e
xpect the\nconstruction to work equally well classically and quantum mecha
nically. While that is true for superfluids and solids\,\none instead find
s that for genuine fluids things are made more complicated by the unusual
dynamics of their transverse\nmodes\, which are not described by a Fock s
pace. Focussing on the incompressible limit in 2+1 dimensions\, I illustra
te how a consistent quantum mechanical description of a perfect fluid can
be obtained by using the known equivalence between the area preserving dif
feomorfism group in 2D and $SU(N)$ with $N\\to \\infty$.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ethan Lake (MIT)
DTSTART:20210224T170000Z
DTEND:20210224T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/28
DESCRIPTION:Title: Bose-Luttinger liquids\nby Ethan Lake (MIT) as part of Carnegie
Mellon theoretical physics\n\n\nAbstract\nIn this talk I will explain the
physics behind a new class of quantum phases of matter known as ``Bose-Lu
ttinger liquids''. A Bose-Luttinger liquid is a phase of matter which in s
ome respects can be thought of as a metal\, but with charge carriers that
are bosons\, instead of electrons. For condensed matter theorists\, these
phases are interesting because they provide easy-to-understand examples of
metallic systems without quasiparticles\, and may help explain some inte
resting quantum critical phenomena in certain types of helical magnets.
For high-energy theorists\, they are interesting because they provide exam
ples of RG fixed points with infinitely many marginal deformations\, which
can nonetheless be described using the technology of 2d CFT. This talk wi
ll be based on the preprint arXiv:2101.02197.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tomas Brauner (Stavanger University)
DTSTART:20210317T160000Z
DTEND:20210317T170000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/29
DESCRIPTION:Title: Higher-form and higher-group symmetry in mixed superfluids\nby
Tomas Brauner (Stavanger University) as part of Carnegie Mellon theoretica
l physics\n\n\nAbstract\nHigher-form symmetries are symmetries that act on
extended objects. I will give a brief introduction to this concept and sh
ow how higher-form symmetries naturally emerge as a consequence of spontan
eous breaking of ordinary (0-form) symmetries. They can therefore be expec
ted to be present in superfluids and generalizations thereof. Furthermore\
, when two or more different types of superfluids are mixed\, a more gener
al symmetry structure appears\, usually referred to as a higher group. The
presence of this mathematical structure reflects the interplay of topolog
ical defects of the various superfluid components.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alfredo Guevara Gonzalez (Harvard University)
DTSTART:20210310T170000Z
DTEND:20210310T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/30
DESCRIPTION:Title: From QFT amplitudes to wave scattering in Kerr\nby Alfredo Guev
ara Gonzalez (Harvard University) as part of Carnegie Mellon theoretical p
hysics\n\n\nAbstract\nIn recent years\, a striking connection between QFT
scattering amplitudes and classical black hole physics has been developed.
In this talk we will consider the scattering of massless waves off a Kerr
black hole. The classical Newman-Penrose amplitudes are found to coincide
with certain QFT amplitudes at finite values of the scattering angle\, pro
vided 1) a precise classical limit is implemented on the QFT side and 2) t
he black hole background is modelled as an interacting matter particle wit
h spin. The QFT amplitudes describe the $2\\to 2$ tree-level scattering of
a helicity-$|h|$ particle with a massive spin-S particle\, where the spin
can be taken arbitrarily high. We will finally discuss the application of
our results to the computation of gravitational radiation in the (bounded
) two-body problem.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergey Sibiryakov (CERN)
DTSTART:20210331T160000Z
DTEND:20210331T170000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/31
DESCRIPTION:Title: Black hole induced false vacuum decay from first principles\nby
Sergey Sibiryakov (CERN) as part of Carnegie Mellon theoretical physics\n
\n\nAbstract\nIt has been proposed that microscopic black holes can cataly
ze decay of metastable false vacuum. The calculations of the decay rate ex
isting in the literature make use of the Euclidean time formalism develope
d for equilibrium configurations. This is not the case\, however\, for a r
ealistic black hole formed by gravitational collapse and emitting Hawking
radiation. I will review the motivations to study black hole catalysis of
vacuum decay\, propose a general method to calculate the decay rate\, and
illustrate it on a two-dimensional toy model.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ioanna Kourkoulou (Columbia University)
DTSTART:20210414T160000Z
DTEND:20210414T170000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/32
DESCRIPTION:Title: Lorentz invariance in Framids as a potential technical analog of th
e CCP\nby Ioanna Kourkoulou (Columbia University) as part of Carnegie
Mellon theoretical physics\n\n\nAbstract\nThe Framid is a hypothetical sys
tem whose ground state spontaneously breaks boost symmetry\, however its s
tress-energy tensor retains a Lorentz-invariant expectation value on the g
round state\, as we verify explicitly to one-loop order. The mechanism enf
orcing this result is rather obscure\; in fact\, we think this puzzle is a
n interesting technical analog of the cosmological constant problem. I wil
l describe our computations that verify the Lorentz invariance of the expe
ctation value in question\, and how these yield the expected result only t
hanks to highly nontrivial cancellations\, which are quite mysterious from
the low-energy effective theory viewpoint.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Azadeh Maleknejad (CERN)
DTSTART:20210421T160000Z
DTEND:20210421T170000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/33
DESCRIPTION:Title: Is Our Universe the Remnant of Chiral Anomaly in Inflation?\nby
Azadeh Maleknejad (CERN) as part of Carnegie Mellon theoretical physics\n
\n\nAbstract\nModern cosmology has been remarkably successful in describin
g the Universe from a second after the Big Bang until today. However\, its
physics before that time is still much less certain. It profoundly involv
es particle theory beyond the Standard Model to explain long-standing puzz
les: the origin of the observed matter asymmetry\, nature of dark matter\,
massive neutrinos\, and cosmic inflation. In this talk\, I will explain t
hat a new framework based on embedding axion-inflation in left-right symme
tric gauge extensions of the SM can possibly solve and relate these seemin
gly unrelated mysteries of modern particle physics and cosmology. The bary
on asymmetry and dark matter today are remnants of a pure quantum effect (
chiral anomaly) in inflation which is the source of CP violation in inflat
ion. As a smoking gun\, this setup has robust observable signatures for th
e GW background to be probed by future CMB missions and laser interferomet
er detectors.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Austin Joyce (University of Chicago)
DTSTART:20211208T173000Z
DTEND:20211208T183000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/34
DESCRIPTION:Title: Gravity as a phase of matter\nby Austin Joyce (University of Ch
icago) as part of Carnegie Mellon theoretical physics\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Angelo Esposito (IAS)
DTSTART:20210922T163000Z
DTEND:20210922T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/35
DESCRIPTION:Title: Primordial nongaussianities from consistency relations: a proof of
principle\nby Angelo Esposito (IAS) as part of Carnegie Mellon theoret
ical physics\n\n\nAbstract\nConsistency relations are the cosmological ana
logues of the soft pion theorem\, connecting the soft limit of certain cor
relators to other correlators. Due to their nonperturbative nature\, they
remain true also in fully nonlinear regimes (where the standard approach f
ails)\, and for astrophysically messy observables (like galaxy distributio
ns).\nIn this seminar I will discuss how we can use the consistency relati
ons for large scale structures to determine whether or not inflation was d
riven by the dynamics of a single field. I will do that using a suite of N
-body simulations for the matter distributions\, and discuss how to extend
this to a more realistic scenario.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Benjamin Doyon (King's College)
DTSTART:20211020T163000Z
DTEND:20211020T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/36
DESCRIPTION:Title: The hydrodynamics of many-body integrable systems\nby Benjamin
Doyon (King's College) as part of Carnegie Mellon theoretical physics\n\n\
nAbstract\nHydrodynamics is a powerful theory for the emergent behaviours
at large scales of space-time in many-body systems. The theory says that o
nly few degrees of freedom are sufficient in order to describe what is obs
erved at such scales\, and it provides equations for the dynamics of these
degrees of freedom. Think of the simple water waves emerging from the mot
ion and interaction of a myriad of water molecules. It is strongly based o
n the presence of microscopic conservation laws in the many-body model\, s
uch as conservation of energy\, momentum and mass. But the standard equati
ons of hydrodynamics fail to describe one-dimensional integrable systems\,
including the ultracold atomic gases observed in experiments. Integrable
systems admit an extensive number of conservation laws\, which must be tak
en into account in the emergent hydrodynamic theory. Recently this theory\
, dubbed ``generalised hydrodynamics”\, has been developed. In this talk
\, I will review fundamental aspects of hydrodynamics and the main idea an
d equations of generalised hydrodynamics. I will discuss recent cold-atom
experiments that confirm the theory\, some of the exact results that can b
e obtained with this formalism such as nonequilibrium steady states and as
ymptotic of correlation functions\, and if time permit some mathematically
rigorous results in these directions.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matt Lewandowski (Northwestern U.)
DTSTART:20211027T163000Z
DTEND:20211027T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/37
DESCRIPTION:Title: Gravitational Causality and the Self-Stress of Photons\nby Matt
Lewandowski (Northwestern U.) as part of Carnegie Mellon theoretical phys
ics\n\n\nAbstract\nWe study causality in gravitational systems beyond the
classical limit. Using on-shell methods\, we consider the one-loop correc
tions from charged particles to the photon energy- momentum tensor —the
self-stress— that controls the quantum interaction between two on-shell
photons and one off-shell graviton. The self-stress determines in turn th
e phase shift and time delay in the scattering of photons against a specta
tor particle of any spin in the eikonal regime. We show that the sign of
the beta-function associated to the running gauge coupling is related to t
he sign of time delay at small impact parameter. Our results show that\,
at first post-Minkowskian order\, asymptotic causality\, where the time de
lay experienced by any particle must be positive\, is respected quantum me
chanically. Contrasted with asymptotic causality\, we explore a local not
ion of causality\, where the time delay is longer than the one of graviton
s\, which is seemingly violated by quantum effects.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Massimiliano-Maria Riva (IPhT)
DTSTART:20211201T173000Z
DTEND:20211201T183000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/39
DESCRIPTION:Title: Gravitational Bremsstrahlung in the Post-Minkowskian expansion\
nby Massimiliano-Maria Riva (IPhT) as part of Carnegie Mellon theoretical
physics\n\n\nAbstract\nI will discuss the scattering of two compact object
s interacting via gravity\, using the so-called world-line Effective Field
Theory approach in the post-Minkowskian expansion (i.e. expanding in the
Newton's constant G but not in the velocities). In particular\, I will foc
us on the computation of classical observables such as the total emitted m
omentum. This is obtained by phase-space integration of the graviton momen
tum weighted by the modulo squared of the radiation amplitude. It can be r
ecast as an effective cut two-loop integral that I will solve using techni
ques borrowed from particle physics.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Julio Parra Martinez (Caltech)
DTSTART:20211116T173000Z
DTEND:20211116T183000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/40
DESCRIPTION:Title: Geometric soft theorems (part 1)\nby Julio Parra Martinez (Calt
ech) as part of Carnegie Mellon theoretical physics\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Guanhao Sun (Columbia U.)
DTSTART:20211103T163000Z
DTEND:20211103T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/41
DESCRIPTION:Title: Anisotropies in icosahedral inflation\nby Guanhao Sun (Columbia
U.) as part of Carnegie Mellon theoretical physics\n\n\nAbstract\nIn this
talk\, I will present recent work done on analyzing the unique observatio
nal imprints of icosahedral inflation. Icosahedral inflation is a variatio
n of solid inflation\, in which the dynamics of the system are driven by a
triplet of scalars satisfying internal icosahedral symmetry. This model i
s motivated by a hunt for an intrinsically anisotropic symmetry that gives
isotropic background stress tensor and two-point function\, and the model
predicts a completely isotropic scalar power spectrum while introducing a
nisotropic corrections to the tensor power spectrum and the bispectrum. A
mixed scalar-tensor two-point function is also allowed. Observationally\,
it is possible to have a maximally anisotropic scalar bispectrum\, and non
-zero T-B and E-B correlations for the CMB temperature-polarization spectr
um. The statistical anisotropies also give rise to non-zero bipolar spheri
cal harmonics and bipolar power spectrum\, which are calculated and will b
e discussed in the talk.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Julio Parra Martinez (Caltech)
DTSTART:20211117T173000Z
DTEND:20211117T183000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/42
DESCRIPTION:Title: Geometric soft theorems (part 2)\nby Julio Parra Martinez (Calt
ech) as part of Carnegie Mellon theoretical physics\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Donal O'Connell (University of Edinburgh)
DTSTART:20220323T163000Z
DTEND:20220323T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/43
DESCRIPTION:by Donal O'Connell (University of Edinburgh) as part of Carneg
ie Mellon theoretical physics\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/43/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mohit Randeria (Ohio State University)
DTSTART:20220202T173000Z
DTEND:20220202T183000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/44
DESCRIPTION:by Mohit Randeria (Ohio State University) as part of Carnegie
Mellon theoretical physics\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/44/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anders Tranberg (University of Stavanger)
DTSTART:20220518T163000Z
DTEND:20220518T173000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/45
DESCRIPTION:by Anders Tranberg (University of Stavanger) as part of Carneg
ie Mellon theoretical physics\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mustafa Amin (Rice University)
DTSTART:20220516T170000Z
DTEND:20220516T180000Z
DTSTAMP:20260404T094659Z
UID:CMU-TP/46
DESCRIPTION:Title: Small-Scale Structure in Vector Dark Matter\nby Mustafa Amin (R
ice University) as part of Carnegie Mellon theoretical physics\n\n\nAbstra
ct\nCan we figure out the spin of dark matter from astrophysical observati
ons? I will talk about new phenomenology of (ultra)light vector dark matt
er including (i) a new class of polarized vector solitons (ii) interferen
ce patterns in density (iii) intrinsic spin. I will provide results for n
onlinear structure formation in vector dark matter where this phenomenolog
y is naturally present. These effects lead to signals in astrophysics and
direct detection that can potentially distinguish vector dark matter from
their scalar counterpart. Time permitting\, I will discuss the generaliza
tion of above phenomenology to higher spin bosonic fields.\n
LOCATION:https://stable.researchseminars.org/talk/CMU-TP/46/
END:VEVENT
END:VCALENDAR