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X-WR-CALNAME:IAS Physics-external
BEGIN:VEVENT
UID:64613833-6139-4237-b263-323137353934
DTSTAMP:20220123T094604Z
CREATED:20210920T165003Z
DESCRIPTION:Topic: Quantifying the Unknown Using Electromagnetic and Gravit
ational Observations of Compact Objects\n\nSpeakers: Alejandro Cárdenas-Av
endaño\n\nAffiliation: Princeton University\n\nOver the past years\, elect
romagnetic and gravitational observations\nhave been used to understand th
e nature of compact objects and the\nmatter around them. However\, our abi
lity to learn about the underlying\nfundamental physics depends heavily on
our understanding of the theory\nof gravity that describes the geometry a
round these compact objects\,\nand the complex astrophysics that produces
the observed radiation. If\nnature deviates from general relativity in the
strong gravity regime\,\nwould we be able to measure possible observation
al signatures\nimprinted in the electromagnetic and gravitational spectra?
\n\nIn this talk\, I will discuss our current ability to constraint\nspace
times that deviate parametrically from general relativity's\nclassical sol
utions\, using the electromagnetic radiation emitted by an\naccretion disk
around a black hole\, and the gravitational waves\nproduced when comparab
le-mass black holes collide. I will finish by\ndescribing how combined mea
surements from NICER with LIGO/Virgo\nobservations can perform a theory-ag
nostic and equation-of-state\ninsensitive test of general relativity using
neutron stars. \n
DTSTART:20211025T163000Z
DTEND:20211025T173000Z
LAST-MODIFIED:20211022T161631Z
LOCATION:Jadwin\, 4th floor or Zoom
SUMMARY:Princeton University Gravity Initiative Fall Seminar Series
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
fall-seminar-series-4
END:VEVENT
BEGIN:VEVENT
UID:34353164-3161-4832-b839-663830366339
DTSTAMP:20220123T094604Z
CREATED:20210920T165134Z
DESCRIPTION:Topic: Gravitational Waves in Numerical Relativity and the Impo
rtance of BMS Frames\n\nSpeakers: Keefe Mitman\n\nAffiliation: California
Institute of Technology\n\nAs was realized by Bondi\, Metzner\, van der Bu
rg\, and Sachs (BMS)\, the\nsymmetry group of asymptotic infinity is not t
he Poincaré group\, but\nan infinite-dimensional group called the BMS grou
p. Because of this\,\nunderstanding the BMS frame of the gravitational wav
es produced by\nnumerical relativity is crucial for ensuring that analyses
on such\nwaveforms and comparisons with other waveform models are perform
ed\nproperly. Up until now\, however\, the BMS frame of numerical waveform
s\nhas not been thoroughly examined\, largely because the necessary tools
\nhave not existed. In this talk\, I will highlight new methods that have
\nled to improved numerical waveforms\; specifically\, I will explain what
\nthe gravitational memory effect is and how it has recently been\nresolve
d in numerical relativity. Following this\, I will then\nillustrate how we
fix the BMS frame of numerical waveforms to perform\nmuch more accurate c
omparisons with either Post-Newtonian or\nQuasi-normal Mode models.\n
DTSTART:20211101T163000Z
DTEND:20211101T173000Z
LAST-MODIFIED:20210920T165340Z
LOCATION:Jadwin\, 4th floor or Zoom
SUMMARY:Princeton University Gravity Initiative Fall Seminar Series
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
fall-seminar-series-5
END:VEVENT
BEGIN:VEVENT
UID:62333665-3633-4166-a639-333833323239
DTSTAMP:20220123T094604Z
CREATED:20211027T134001Z
DESCRIPTION:Topic: Bootstrap of the KLT Double-Copy\n\nSpeakers: Henriette
Elvang\n\nAffiliation: University of Michigan\n\nThis talk will be held on
Zoom:\nhttps://princeton.zoom.us/j/97195348538?pwd=bEhjczRmbnNIZjNydFpYQX
N0bXZWQT09\n\nABSTRACT: In field theory\, the 'double copy' can be thought
of as a\nmultiplicative map between tree amplitudes of two field theories
into\ntree amplitudes of another theory. This map has an identity element
\nthat is closely linked to the multiplication kernel that defines the\nKL
T formulation of the double-copy. The kernel ensures that the result\nof t
he product of color-ordered tree amplitude results in an amplitude\nof a l
ocal theory: for example\, it ensures the cancelation of\nunphysical doubl
e-poles and it supplies missing poles. From a\nbottom-up EFT perspective\,
such properties place constraints on\ngeneralizations of the double copy\
, such as higher-derivative\ncorrections. We explore these constraints and
formulate a program to\nbootstrap the double-copy kernel from the bottom-
up using the KLT\nalgebra. This results in a generalized double-copy for E
FTs and an\ninteresting question is from such a bottom-up approach\, what
makes the\nKLT string theory kernel special? In the talk\, I'll describe t
hese\nideas and give examples of applications.\n
DTSTART:20211101T183000Z
DTEND:20211101T200000Z
LAST-MODIFIED:20211101T142602Z
LOCATION:Remote via Zoom
SUMMARY:PU High Energy Theory Seminar
URL:https://www.ias.edu/sns/events/pu-high-energy-theory-seminar-2
END:VEVENT
BEGIN:VEVENT
UID:65663330-3837-4563-b437-663132373037
DTSTAMP:20220123T094604Z
CREATED:20211029T183017Z
DESCRIPTION:Topic: Neutron Star Mergers\, Gravitational Waves and the Origi
n of the Elements\n\nSpeakers: Eliot Quataert\n\nAffiliation: Princeton Un
iversity\n\nThe discovery of compact object mergers by LIGO has opened up
a new\nwindow into the Universe’s most exotic objects\, neutron stars and
\nblack holes. Maximizing the scientific return of this new window\nrequir
es connecting gravitational wave detections to the wealth of\nelectromagne
tic data on similar sources. I will describe the\nremarkable progress in t
his direction with the first neutron stat\nmerger detected in 2017\, empha
sizing the simple underlying physics\nbehind these discoveries. I will als
o look ahead to some of the\ndiversity that may be expected in the joint\n
electromagnetic-gravitational wave sky.\n
DTSTART:20211102T200000Z
DTEND:20211102T210000Z
LAST-MODIFIED:20211029T183328Z
LOCATION:Jadwin A-10
SUMMARY:Princeton University Department of Physics Donald R. Hamilton Collo
quium Series
URL:https://www.ias.edu/sns/events/princeton-university-department-physics-
donald-r-hamilton-colloquium-series-2
END:VEVENT
BEGIN:VEVENT
UID:33366564-6262-4639-a631-383463323831
DTSTAMP:20220123T094604Z
CREATED:20211027T134505Z
DESCRIPTION:Topic: Perturbative and Non-Perturbative Aspects of 2D Type 0B
String Theory\n\nSpeakers: Victor Rodriguez\n\nAffiliation: Princeton Univ
ersity\n\nTHIS TALK WILL BE HELD IN PCTS\, ROOM 407 AND ON ZOOM:\nhttps://
princeton.zoom.us/j/97195348538?pwd=bEhjczRmbnNIZjNydFpYQXN0bXZWQT09\n\nAB
STRACT: Two-dimensional string theories provide rich laboratories\nfor inv
estigating fundamental aspects of string theory and holographic\nduality.
In this talk\, I will study the S-matrix elements of closed\nstrings in th
e 2D type 0B string theory from the worldsheet\nperspective.\n\nFirst\, at
the level of string perturbation theory\, I will describe the\ncomputatio
n of the tree level 3- and 4-point scattering amplitudes and\nshow that th
ey agree with the conjectured dual matrix quantum\nmechanics (MQM).\n\nSec
ond\, I will describe non-perturbative effects mediated by\nD-instantons o
n closed string scattering amplitudes. In particular\, I\nwill discuss the
contribution from a pair of a D-instanton and an\nanti-D-instanton to the
closed string reflection amplitude and show\nthat it agrees with the corr
esponding non-perturbative corrections due\nto the tunneling of fermions i
n the proposed dual MQM.\n\nThese results provide strong evidence for the
conjectured exact\nholographic duality between the type 0B string theory a
nd the type 0B\nmatrix quantum mechanics.\n
DTSTART:20211105T174500Z
DTEND:20211105T190000Z
LAST-MODIFIED:20211105T160603Z
LOCATION:Jadwin Hall\, PCTS Room 407 & Zoom
SUMMARY:PU High Energy Theory Seminar
URL:https://www.ias.edu/sns/events/pu-high-energy-theory-seminar-3
END:VEVENT
BEGIN:VEVENT
UID:38323937-6265-4832-b765-333337393039
DTSTAMP:20220123T094604Z
CREATED:20211105T140414Z
DESCRIPTION:Topic: The Instability of Anti-de Sitter Spacetime for the Eins
tein-scalar Field System\n\nSpeakers: Georgios Moschidis\n\nAffiliation: P
rinceton University\n\nThe AdS instability conjecture provides an example
of weak turbulence\nappearing in the dynamics of the Einstein equations in
the presence of\na negative cosmological constant. The conjecture claims
the existence\nof arbitrarily small perturbations to the initial data of A
nti-de\nSitter spacetime which\, under evolution by the vacuum Einstein\ne
quations with reflecting boundary conditions at conformal infinity\,\nlead
to the formation of black holes after a sufficiently long time.\n\nIn thi
s talk\, I will present rigorous proof of the AdS instability\nconjecture
in the setting of the spherically symmetric Einstein-scalar\nfield system.
The construction of the unstable initial data will\nrequire carefully des
igning a family of initial configurations of\nlocalized matter beams and e
stimating the exchange of energy taking\nplace between interacting beams o
ver long periods of time\, as well as\nestimating the decoherence rate of
those beams. I will also discuss\npossible paths for extending these ideas
to the vacuum case.\n
DTSTART:20211108T173000Z
DTEND:20211108T183000Z
LAST-MODIFIED:20211105T140556Z
LOCATION:Jadwin\, 4th floor or Zoom
SUMMARY:Princeton University Gravity Initiative Fall Seminar Series
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
fall-seminar-series-6
END:VEVENT
BEGIN:VEVENT
UID:35616439-3561-4236-a235-373130636138
DTSTAMP:20220123T094604Z
CREATED:20211027T134806Z
DESCRIPTION:Topic: A Few Applications of String Field Theory\n\nSpeakers: M
injae Cho\n\nAffiliation: Princeton University\n\nTHIS TALK WILL BE HELD I
N PCTS\, ROOM 407 AND ON ZOOM:\nhttps://princeton.zoom.us/j/97195348538?pw
d=bEhjczRmbnNIZjNydFpYQXN0bXZWQT09\n\nABSTRACT: String field theory is usu
ally considered to be a difficult\nand complicated object to understand an
d study. However\, due to its\nfield-theoretic nature\, it provides a usef
ul framework to address\nphysical questions which are in particular natura
l from field theory\nperspective. Moreover\, it has recently been emphasiz
ed that string\nfield theory is the appropriate framework for the usual te
xtbook\nstring perturbation theory. In this talk\, after a very mild\nintr
oduction to the framework of string field theory\, I will discuss\nthree o
f its recent applications illustrating the above aspects:\nopen-closed dua
lity\, strings in Ramond-Ramond flux background\, and\nD-instanton in type
IIB superstring theory.\n
DTSTART:20211108T193000Z
DTEND:20211108T210000Z
LAST-MODIFIED:20211105T160459Z
LOCATION:*Princeton University\, 407 Jadwin Hall\, PCTS Seminar Room*\, and
on Zoom
SUMMARY:PU High Energy Theory Seminar
URL:https://www.ias.edu/sns/events/pu-high-energy-theory-seminar-4
END:VEVENT
BEGIN:VEVENT
UID:38346134-3163-4535-b261-386232666332
DTSTAMP:20220123T094604Z
CREATED:20211105T152439Z
DESCRIPTION:Topic: Planckian Metals and Black Holes\n\nSpeakers: Subir Sach
dev\n\nAffiliation: Harvard University\n\nMany modern materials feature a
“Planckian metal”: a phase of\nelectronic quantum matter without quasipart
icle excitations\, and\nrelaxation in a time of order Planck's constant di
vided by the\nabsolute temperature. The semiclassical theory of black hole
s predicts\nthermodynamic properties which are difficult to connect to a u
nitary\nquantum theory with a discrete spectrum. I will review recent prog
ress\nin understanding these problems in very different fields of physics
by\nusing insights from the Sachdev-Ye-Kitaev model of many-particle\nquan
tum dynamics.\n
DTSTART:20211111T210000Z
DTEND:20211111T220000Z
LAST-MODIFIED:20211105T152542Z
LOCATION:Jadwin A-10
SUMMARY:Princeton University Department of Physics Donald R. Hamilton Collo
quium Series
URL:https://www.ias.edu/sns/events/princeton-university-department-physics-
donald-r-hamilton-colloquium-series-3
END:VEVENT
BEGIN:VEVENT
UID:32626439-3431-4662-b134-373566653461
DTSTAMP:20220123T094604Z
CREATED:20211105T140603Z
DESCRIPTION:Topic: The Characteristic Gluing Problem of General Relativity
\n\nSpeakers: Stefan Czimek\n\nAffiliation: Brown University\n\nIn this ta
lk\, we introduce and solve the characteristic gluing problem\nfor the Ein
stein vacuum equations. We prove that obstructions to\ncharacteristic glui
ng come from an infinite-dimensional space of\nconservation laws along nul
l hypersurfaces for the linearized\nequations at Minkowski. We show that t
his obstruction space splits\ninto an infinite-dimensional space of gauge-
dependent charges and a\n10-dimensional space of gauge-invariant charges.
We identify the 10\ngauge-invariant charges to be related to the energy\,
linear momentum\,\nangular momentum\, and center-of-mass of the spacetime.
Based on this\nidentification\, we explain how to characteristically glue
a given\nspacetime to a suitably chosen Kerr black hole spacetime. As\nco
rollary\, we get an alternative proof of the Corvino-Schoen spacelike\nglu
ing to Kerr. Moreover\, we apply our characteristic gluing method to\nloca
lize characteristic initial data along null hypersurfaces. In\nparticular\
, this yields a new proof of the Carlotto-Schoen spacelike\nlocalization w
here our method yields no loss of decay\, thus resolving\nan open problem
in this direction. We also outline further\napplications. This is joint wo
rk with S. Aretakis (Toronto) and I.\nRodnianski (Princeton).\n
DTSTART:20211115T173000Z
DTEND:20211115T183000Z
LAST-MODIFIED:20211105T140719Z
LOCATION:Jadwin\, 4th floor or Zoom
SUMMARY:Princeton University Gravity Initiative Fall Seminar Series
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
fall-seminar-series-7
END:VEVENT
BEGIN:VEVENT
UID:38616139-3364-4230-b836-333166346330
DTSTAMP:20220123T094604Z
CREATED:20211119T133038Z
DESCRIPTION:Topic: Gravitational-wave Multimessenger Observations from the
Production of Gold to the Expansion of the Universe\n\nSpeakers: Hsin-Yu C
hen\n\nAffiliation: Massachusetts Institute of Technology\n\nOver last six
years\, the LIGO-Virgo detections of gravitational waves\nfrom compact bi
nary mergers have underlined their promise as an\nindependent and powerful
tool to explore the Universe. Nevertheless\,\nthe electromagnetic observa
tions of the counterparts of\ngravitational-wave sources provide different
and complementary\ninformation about the binary systems\, and therefore t
he combination of\n`multimessengers' is expected to lead to significantly
enhanced\nscience outcomes. In this talk\, I will highlight several promis
ing\nmeasurements in cosmology and nuclear physics from LIGO-Virgo\nobserv
ations. I will then discuss the challenges and future aspects in\nthese ar
eas.\n
DTSTART:20211122T173000Z
DTEND:20211122T183000Z
LAST-MODIFIED:20211119T133148Z
LOCATION:Jadwin\, 4th floor or Zoom
SUMMARY:Princeton University Gravity Initiative Fall Seminar Series
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
fall-seminar-series-10
END:VEVENT
BEGIN:VEVENT
UID:35353635-6239-4433-a133-386537633963
DTSTAMP:20220123T094604Z
CREATED:20211119T210054Z
DESCRIPTION:Topic: Dispersion Formulas for AdS/CFT and Inflation\n\nSpeaker
s: David Meltzer\n\nAffiliation: Cornell University\n\nTHIS TALK WILL BE H
ELD ZOOM:\nhttps://princeton.zoom.us/j/97195348538?pwd=bEhjczRmbnNIZjNydFp
YQXN0bXZWQT09\n\nABSTRACT: Dispersion formulas explain how fundamental con
sistency\nconditions\, such as causality and unitarity\, constrain low-ene
rgy\nphysical observables. In this talk I will discuss how dispersion\nfor
mulas in Minkowski\, de Sitter\, and Anti-de Sitter space are\nrelated. In
the first part I will discuss the relationship between the\nrecently disc
overed conformal dispersion formula and the momentum\nspace dispersion for
mulas originally derived in axiomatic quantum\nfield theory. Specifically\
, I will argue that the four-point conformal\ndispersion formula is equiva
lent to a standard QFT momentum-space\ndispersion formula applied to a con
formal correlation function. In the\nprocess\, I will discuss possible ext
ensions of the conformal\ndispersion formula to higher-point functions. In
the second part I\nwill explain how perturbative\, momentum-space dispers
ion formulas can\nbe used to simplify the computation of inflationary obse
rvables in\nquasi-dS spacetimes. As an example\, I will show how dispersio
n\nformulas can be used to find simple expressions for higher-point\nwavef
unction coefficients in the EFT of single-field inflation. \n
DTSTART:20211122T193000Z
DTEND:20211122T210000Z
LAST-MODIFIED:20211119T210237Z
LOCATION:via ZOOM
SUMMARY:PU High Energy Theory Seminar
URL:https://www.ias.edu/sns/events/pu-high-energy-theory-seminar-6
END:VEVENT
BEGIN:VEVENT
UID:35386637-6563-4437-b336-346138383165
DTSTAMP:20220123T094604Z
CREATED:20211105T140735Z
DESCRIPTION:Topic: Black Holes Beyond General Relativity: Shadows\, Stabili
ty\, and Nonlinear Evolution\n\nSpeakers: Aaron Held\n\nAffiliation: Princ
eton University\n\nAbstract: Guided by the principles of effective field t
heory\, I will\ndiscuss three consecutive avenues to constrain physics bey
ond General\nRelativity with black-hole observations.\n\n1) Shadows: Witho
ut specifying any particular gravitational dynamics\,\nI will discuss imag
e features of black-hole shadows in general\nparameterizations and their r
elation to fundamental-physics principles\nlike (i) regularity (no remaini
ng curvature singularity)\, (ii)\nsimplicity (a single new-physics scale)\
, and (iii) locality (a\nnew-physics scale set by local curvature).\n\n2)
Stability: Specifying the linearized dynamics around black-hole\nspacetime
s determines the onset of potential instabilities and\nconnects to the rin
gdown phase of gravitational waves. I will present\nscenarios in which sai
d instabilities constrain theories of low-scale\ndark energy and ultraligh
t dark matter.\n\n3) Nonlinear evolution: The larger the probed curvature
scale\, the\nbetter the constraints on new physics. Making full use of exp
erimental\ndata\, thus requires predictions in the nonlinear regime of bin
ary\nmergers. I will present recent progress towards achieving stable\nnum
erical evolution for the effective field theory of gravity up to\nquadrati
c order in curvature.\n
DTSTART:20211129T173000Z
DTEND:20211129T183000Z
LAST-MODIFIED:20211122T203141Z
LOCATION:Jadwin\, 4th floor or Zoom
SUMMARY:Princeton University Gravity Initiative Fall Seminar Series
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
fall-seminar-series-8
END:VEVENT
BEGIN:VEVENT
UID:37626364-3635-4331-b061-323339626639
DTSTAMP:20220123T094604Z
CREATED:20211112T193346Z
DESCRIPTION:Topic: Finding Pythons in Unexpected Places\n\nSpeakers: Netta
Engelhardt\n\nAffiliation: MIT\n\nTHIS TALK WILL BE HELD ON ZOOM:\nhttps:/
/princeton.zoom.us/j/97195348538?pwd=bEhjczRmbnNIZjNydFpYQXN0bXZWQT09\n\nA
BSTRACT: We argue that novel (highly nonclassical) quantum extremal\nsurfa
ces play a crucial role in reconstructing the black hole interior\neven fo
r isolated\, single-sided\, non-evaporating black holes (i.e.\nwith no aux
iliary reservoir). Specifically\, any code subspace where\ninterior outgoi
ng modes can be excited will have a quantum extremal\nsurface in its maxim
ally mixed state. We argue that as a result\,\nreconstruction of interior
outgoing modes is always exponentially\ncomplex. Our construction provides
evidence in favor of a strong\nPython's lunch proposal: that nonminimal q
uantum extremal surfaces are\nthe exclusive source of exponential complexi
ty in the holographic\ndictionary.\n
DTSTART:20211129T193000Z
DTEND:20211129T210000Z
LAST-MODIFIED:20211129T192301Z
LOCATION:Zoom
SUMMARY:PU High Energy Theory Seminar
URL:https://www.ias.edu/sns/events/pu-high-energy-theory-seminar-5
END:VEVENT
BEGIN:VEVENT
UID:30363966-3435-4039-a632-613466653931
DTSTAMP:20220123T094604Z
CREATED:20211123T142046Z
DESCRIPTION:Topic: Quantum Information Theory of the Gravitational\n\nSpeak
ers: Masataka Watanabe\n\nAffiliation: Weizmann Institute of Science\n\nTH
IS TALK WILL BE HELD ON ZOOM:\nhttps://princeton.zoom.us/j/97195348538?pwd
=bEhjczRmbnNIZjNydFpYQXN0bXZWQT09\n\nABSTRACT: I am going to argue that th
e non-vanishing\ngravitational anomaly in 2D CFT obstructs the existence o
f the\nwell-defined notion of entanglement. As a corollary\, we will also
see\nthat the non-vanishing gravitational anomaly implies the\nnon-existen
ce of the lattice regulator generalising the\nNielsen-Ninomiya theorem. I
will also generalise this to higher\ndimensions and cases with global symm
etries.\n\nI will also take time to discuss the modified Villain construct
ion of\ncompact free boson with on-site U(1)_m \times U(1)_w symmetries (w
hich\nhas a mixed anomaly)\, proposed by Gorantla\, Lam\, Seiberg and Shao
. I\nwill argue that this construction seemingly contradicts the global\ns
ymmetry version of our theorem\, but it doesn't.\n\nFinally\, I will concl
ude the talk with possible future directions\,\nin particular the implicat
ion it might have for the island conjecture.\nThe talk is based on my rece
nt paper with Simeon Hellerman and\nDomenico Orlando [2101.03320].\n
DTSTART:20211130T184500Z
DTEND:20211130T200000Z
LAST-MODIFIED:20211129T192440Z
LOCATION:via ZOOM
SUMMARY:PU High Energy Theory Seminar
URL:https://www.ias.edu/sns/events/pu-high-energy-theory-seminar-7
END:VEVENT
BEGIN:VEVENT
UID:63376665-6132-4834-b335-343563643638
DTSTAMP:20220123T094604Z
CREATED:20211123T143156Z
DESCRIPTION:Topic: One-dimensional sectors from the squashed three-sphere\n
\nSpeakers: Pieter Bomans\n\nAffiliation: Princeton University\n\nTHIS TAL
K WILL BE HELD IN PCTS\, ROOM 407 AND ON ZOOM:\nhttps://princeton.zoom.us/
j/97195348538?pwd=bEhjczRmbnNIZjNydFpYQXN0bXZWQT09\n\nABSTRACT: I will sho
w that every three-dimensional N=4 superconformal\nfield theory on the squ
ashed sphere contains a set of protected\noperators whose correlation func
tions are governed by a\none-dimensional theory. This one-dimensional theo
ry arises from\nsupersymmetric localization with respect to a special supe
rcharge\nwhich is not contained in any N=2 subalgebra of the supersymmetry
\nalgebra. For theories built out of vector and hypermultiplets I will\nex
plicitly construct the one-dimensional theory and discuss its most\nimport
ant properties.\n
DTSTART:20211203T184500Z
DTEND:20211203T200000Z
LAST-MODIFIED:20211201T152851Z
LOCATION:Jadwin Hall\, PCTS Room 407 & Zoom
SUMMARY:PU High Energy Theory Seminar
URL:https://www.ias.edu/sns/events/pu-high-energy-theory-seminar-8
END:VEVENT
BEGIN:VEVENT
UID:37613937-6562-4064-a661-623233376532
DTSTAMP:20220123T094604Z
CREATED:20211105T140813Z
DESCRIPTION:Topic: Surprises in Gravitational Scattering\n\nSpeakers: Sam G
ralla\n\nAffiliation: University of Arizona\n\nAbstract: What happens when
two masses scatter? This deceptively\nsimple question has produced a ser
ies of surprises that touch on deep\nissues in general relativity\, such a
s the localizability of\ngravitational field energy\, the notion of asympt
otic flatness at\ntimelike infinity\, and observability of particle positi
on. Most\nrecently\, we found that the mechanical center of mass of the s
ystem\nundergoes a shift during the scattering process\, akin to a person
\nscooting forward on the floor. This “gravitational scoot”\nappears at t
he first post-Minkowskian order (1PM) in the traditional\norder-counting\,
but appears to be essentially non-perturbative in\nnature. It also occur
s in electromagnetism\, where it can be clearly\nunderstood as a permanent
exchange of center-of-mass between particles\nand field. In this talk I
will review recent developments in\ngravitational scattering\, discuss our
novel calculation of 2PM\nscattering using self-force methods\, and prese
nt the gravitational and\nelectromagnetic scoots.\n
DTSTART:20211206T173000Z
DTEND:20211206T183000Z
LAST-MODIFIED:20211123T143456Z
LOCATION:Jadwin\, 4th floor or Zoom
SUMMARY:Princeton University Gravity Initiative Fall Seminar Series
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
fall-seminar-series-9
END:VEVENT
BEGIN:VEVENT
UID:31356631-3737-4330-b264-373662646266
DTSTAMP:20220123T094604Z
CREATED:20211209T135632Z
DESCRIPTION:Topic: Dynamics of Collisionless Plasmas and Flares at the Even
t Horizon\n\nSpeakers: Alexander (Sasha) Philippov\n\nAffiliation: Flatiro
n Institute\, Center for Computational Astrophysics\n\nAbstract: Supermass
ive black holes create powerful jets of radiation\nand plasma particles th
at move close to the speed of light. The\nanswers to the questions “how ex
actly are jets powered by energy\nextraction from a black hole” and “what
are the processes that\nenergize plasma particles” are crucial to understa
nding the observed\nactivity. Recent years opened new spectacular observat
ional windows\ninto studying plasmas that emit observed light\, including
\nmulti-wavelength observations of powerful flares and the black hole\n“sh
adow” by the Event Horizon Telescope. These exciting\ndiscoveries\, as wel
l as attempts to improve the understanding of the\nnature of the curved sp
acetime\, call for a new level of quantitative\nunderstanding of plasma dy
namics around black holes. In this talk\, I\nwill discuss recent progress
in first-principles numerical modeling of\nprocesses that can power jets\,
flares and pair discharges near the\nblack holes.\n
DTSTART:20211213T173000Z
DTEND:20211213T183000Z
LAST-MODIFIED:20211209T135834Z
LOCATION:Jadwin Hall\, 4th floor or Zoom
SUMMARY:Princeton University Gravity Initiative Fall Seminar Series
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
fall-seminar-series-11
END:VEVENT
BEGIN:VEVENT
UID:66373635-3836-4930-b231-313032663861
DTSTAMP:20220123T094604Z
CREATED:20211201T153414Z
DESCRIPTION:Topic: The Tadpole Problem\n\nSpeakers: Severin Lust\n\nAffilia
tion: Harvard University\n\nTHIS TALK WILL BE HELD IN JADWIN HALL\, PCTS R
OOM 407 AND ON ZOOM:\nhttps://princeton.zoom.us/j/97195348538?pwd=bEhjczRm
bnNIZjNydFpYQXN0bXZWQT09\n\nABSTRACT: I will discuss string theory compact
ifications where a\nlarge number of moduli is stabilized by fluxes. I will
present a\nconjecture which rules out the stabilization of all complex-st
ructure\nmoduli in F-theory at a generic point in moduli space by fluxes t
hat\nsatisfy the tadpole cancellation condition. Evidence for this\nconjec
ture comes from K3xK3 compactifications. Using evolutionary\nalgorithms we
found that moduli stabilization needs fluxes whose\ncharge is slightly sm
aller than 1/2 of the number of moduli and larger\nthan what is allowed by
tadpole cancellation. I will furthermore\ncomment on possible implication
s on de Sitter vacua obtained by\nantibrane uplift in long warped throats.
\n
DTSTART:20211213T193000Z
DTEND:20211213T210000Z
LAST-MODIFIED:20211203T163208Z
LOCATION:Jadwin Hall\, PCTS Room 407 & Zoom
SUMMARY:PU High Energy Theory Seminar
URL:https://www.ias.edu/sns/events/pu-high-energy-theory-seminar-9
END:VEVENT
BEGIN:VEVENT
UID:65333733-3136-4536-a161-636561306630
DTSTAMP:20220123T094604Z
CREATED:20211215T150303Z
DESCRIPTION:Topic: Celestial Holography '22\n\nTHIS WORKSHOP WILL TAKE PLAC
E ON ZOOM FROM FEBRUARY 1-4\, 2022.\n\nA four-day virtual workshop on rece
nt advancements in flat space\nholography which will bring together resear
chers studying asymptotic\nsymmetries\, amplitudes\, and CFT bootstrap met
hods.\n\nFor up-to-date information please visit: https://pcts.online\n[ht
tps://pcts.online/]\n\nTo register please fill out the following form:\n h
ttps://forms.gle/627nDBaHxZaiebza8\n
DTSTART:20220201T140000Z
DTEND:20220201T220000Z
LAST-MODIFIED:20220114T165953Z
LOCATION:Remote via Zoom
SUMMARY:Princeton University PCTS Workshop
URL:https://www.ias.edu/sns/events/princeton-university-pcts-workshop
END:VEVENT
BEGIN:VEVENT
UID:65303362-3934-4232-a538-633562653763
DTSTAMP:20220123T094604Z
CREATED:20211215T150303Z
DESCRIPTION:Topic: Celestial Holography '22\n\nTHIS WORKSHOP WILL TAKE PLAC
E ON ZOOM FROM FEBRUARY 1-4\, 2022.\n\nA four-day virtual workshop on rece
nt advancements in flat space\nholography which will bring together resear
chers studying asymptotic\nsymmetries\, amplitudes\, and CFT bootstrap met
hods.\n\nFor up-to-date information please visit: https://pcts.online\n[ht
tps://pcts.online/]\n\nTo register please fill out the following form:\n h
ttps://forms.gle/627nDBaHxZaiebza8\n
DTSTART:20220202T140000Z
DTEND:20220202T220000Z
LAST-MODIFIED:20220114T165953Z
LOCATION:Remote via Zoom
SUMMARY:Princeton University PCTS Workshop
URL:https://www.ias.edu/sns/events/princeton-university-pcts-workshop
END:VEVENT
BEGIN:VEVENT
UID:38653364-3734-4739-b266-663430643063
DTSTAMP:20220123T094604Z
CREATED:20211215T150303Z
DESCRIPTION:Topic: Celestial Holography '22\n\nTHIS WORKSHOP WILL TAKE PLAC
E ON ZOOM FROM FEBRUARY 1-4\, 2022.\n\nA four-day virtual workshop on rece
nt advancements in flat space\nholography which will bring together resear
chers studying asymptotic\nsymmetries\, amplitudes\, and CFT bootstrap met
hods.\n\nFor up-to-date information please visit: https://pcts.online\n[ht
tps://pcts.online/]\n\nTo register please fill out the following form:\n h
ttps://forms.gle/627nDBaHxZaiebza8\n
DTSTART:20220203T140000Z
DTEND:20220203T220000Z
LAST-MODIFIED:20220114T165953Z
LOCATION:Remote via Zoom
SUMMARY:Princeton University PCTS Workshop
URL:https://www.ias.edu/sns/events/princeton-university-pcts-workshop
END:VEVENT
BEGIN:VEVENT
UID:30326136-6236-4432-a431-623234613638
DTSTAMP:20220123T094604Z
CREATED:20211215T150303Z
DESCRIPTION:Topic: Celestial Holography '22\n\nTHIS WORKSHOP WILL TAKE PLAC
E ON ZOOM FROM FEBRUARY 1-4\, 2022.\n\nA four-day virtual workshop on rece
nt advancements in flat space\nholography which will bring together resear
chers studying asymptotic\nsymmetries\, amplitudes\, and CFT bootstrap met
hods.\n\nFor up-to-date information please visit: https://pcts.online\n[ht
tps://pcts.online/]\n\nTo register please fill out the following form:\n h
ttps://forms.gle/627nDBaHxZaiebza8\n
DTSTART:20220204T140000Z
DTEND:20220204T220000Z
LAST-MODIFIED:20220114T165953Z
LOCATION:Remote via Zoom
SUMMARY:Princeton University PCTS Workshop
URL:https://www.ias.edu/sns/events/princeton-university-pcts-workshop
END:VEVENT
END:VCALENDAR