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X-WR-CALNAME:IAS Physics-external
BEGIN:VEVENT
UID:cb301bb4-661f-4453-9b35-ecad3f80f25d
DTSTAMP:20201203T113921Z
CREATED:20200904T154928Z
DESCRIPTION:Topic: The Shape of the Black Hole Photon Ring: A Precise Test
of Strong-Field General Relativity\n\nSpeakers: Alex Lupsasca\n\nWe propos
e a new test of strong-field general relativity (GR) based on\nthe univers
al interferometric signature of the black hole photon ring.\nThe photon ri
ng is a narrow ring-shaped feature\, predicted by GR but\nnot yet observed
\, that appears on images of sources near a black hole.\nIt is caused by e
xtreme bending of light within a few Schwarzschild\nradii of the event hor
izon and provides a direct probe of the unstable\nbound photon orbits of t
he Kerr geometry. We show that the precise\nshape of the observable photon
ring is remarkably insensitive to the\nastronomical source profile and ca
n therefore be used as a stringent\ntest of GR. We forecast that a space-b
ased interferometry experiment\ntargeting M87* could test the Kerr nature
of the source to the\nsub-sub-percent level.\n
DTSTART;TZID=America/New_York:20200914T123000
DTEND;TZID=America/New_York:20200914T123000
LAST-MODIFIED:20200909T182224Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/events/princeton-university-gravity-initiative-lunc
h-1
END:VEVENT
BEGIN:VEVENT
UID:6997a095-bb26-42a8-9b59-14d01476f4ba
DTSTAMP:20201203T113921Z
CREATED:20200916T161924Z
DESCRIPTION:Topic: A new instability for higher dimensional black holes\n\n
Speakers: Gabriele Benomio\n\nAffiliation: Princeton University\n\nIn cont
rast with the classical stability of stationary\, asymptotically\nflat bla
ck holes in four dimensions\, some families of higher\ndimensional black h
oles suffer from dynamical instabilities. By\npresenting a mathematical th
eorem on five-dimensional black rings\nrecently proven in my doctoral thes
is\, I will argue for the existence\nof a new instability affecting not on
ly black rings\, but a wide class\nof higher dimensional black holes. This
new instability can be\ndirectly related to a geometric property of highe
r dimensional black\nholes and should be seen as the manifestation of a mo
re general\ndispersive phenomenon independent of the global\, algebraic na
ture of\nthe spacetime considered.\n
DTSTART;TZID=America/New_York:20200921T123000
DTEND;TZID=America/New_York:20200921T123000
LAST-MODIFIED:20200917T131247Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/events/princeton-university-gravity-initiative-lunc
h-2
END:VEVENT
BEGIN:VEVENT
UID:dbe5fb19-95a8-4e68-81f2-f882bda0b647
DTSTAMP:20201203T113921Z
CREATED:20200908T134129Z
DESCRIPTION:Topic: The Gravitational Path Integral Near Extremality\n\nSpea
kers: Joaquin Turiaci\n\nAffiliation: University of California\, Santa Bar
bara\n\nTo join HET Seminar please click link below:\n\nhttps://princeton.
zoom.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09(link\nis extern
al)\n[https://princeton.zoom.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtv
ajVNQT09]\n\nMeeting ID: 985 9550 4817\nPasscode: 604268\nAbstract: I will
explain the relation between the Euclidean path\nintegral over near-extre
mal black hole geometries and its dimensional\nreduction to 2D Jackiw-Teit
elboim gravity. I will focus mostly on the\ncase of 3D gravity and a parti
cular application to pure 3D gravity. I\nwill also mention a connection be
tween more general 2D dilaton-gravity\ntheories\, matrix integrals and the
minimal string.\n
DTSTART;TZID=America/New_York:20200921T143000
DTEND;TZID=America/New_York:20200921T143000
LAST-MODIFIED:20200917T132756Z
LOCATION:via ZOOM
SUMMARY:Princeton University High Energy Theory Seminar
URL:https://www.ias.edu/events/princeton-university-high-energy-theory-semi
nar-3
END:VEVENT
BEGIN:VEVENT
UID:77d2ea60-5b2f-43df-8b52-622c54e3b6f2
DTSTAMP:20201203T113921Z
CREATED:20200908T134523Z
DESCRIPTION:Topic: AdS4/CFT3 Squashed\, Stretched\, Warped and Invaded\n\nS
peakers: Oscar Varela\n\nAffiliation: Utah State University\n\nTo join HET
Seminar please click link below:\n\nhttps://princeton.zoom.us/j/985955048
17?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09(link\nis external)\n[https://princ
eton.zoom.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09]\n\nMeetin
g ID: 985 9550 4817\nPasscode: 604268\nAbstract: The spectrum of single-tr
ace operators of holographic CFTs\nat strong coupling and large N can be m
apped to the spectrum of\nKaluza-Klein modes over the dual AdS supergravit
y solutions. In this\ntalk\, I will focus on two specific CFT3s with AdS4x
S7 gravity duals\nthat arise as infrared fixed points of the ABJM M2-brane
field theory\ndeformed with a certain quadratic and a certain cubic super
potential.\nIn both cases\, the AdS4xS7 product is warped and the metric o
n S7 is\nsquashed and stretched. In the quadratic case\, I will show how\n
Exceptional Field Theory techniques can be used to compute the entire\nspe
ctrum. In the cubic case\, I will show that the spectrum exhibits a\nspace
-invaders scenario\, similar to that known to occur for another\nsquashed
AdS4xS7 solution.\n
DTSTART;TZID=America/New_York:20200925T134500
DTEND;TZID=America/New_York:20200925T134500
LAST-MODIFIED:20200922T165126Z
LOCATION:via ZOOM
SUMMARY:Princeton University High Energy Theory Seminar
URL:https://www.ias.edu/events/princeton-university-high-energy-theory-semi
nar-4
END:VEVENT
BEGIN:VEVENT
UID:74d559a1-b6fc-498a-bb58-bcd4d094a266
DTSTAMP:20201203T113921Z
CREATED:20200922T141132Z
DESCRIPTION:Topic: Neutron star mergers: On the impact of high spins in mul
ti-messenger gravitational wave events\n\nSpeakers: Elias Most\n\nAffiliat
ion: Princeton University\; Member\, School of Natural Sciences\n\nSince t
he first detection of a gravitational wave event of the merger\nof two neu
tron stars in 2017\, two more detections in the neutron star\nmass range h
ave been announced earlier this year. The first one\,\nGW190425\, involved
an unusually massive neutron star\, the second one\,\nGW190814\, had a co
mpanion in the lower mass gap that could either have\nbeen the heaviest ne
utron star or the lightest black hole ever\nobserved. One of the uncertain
ties in those detections is allowing for\nthe possibility of having high i
nitial spins before the merger.\n\nIn this talk\, I will discuss the poten
tial observational impact of the\npresence of high spins in the inspiral.
In particular\, I will show\nwhat effect high spins can have on the emissi
on of – yet to be\nobserved – electromagnetic precursors and on the mass e
jected\ndynamically during the merger process.\n\nThis will be followed by
the presentation of a new method to place\nlimits on high spins and small
mass ratios in mergers involving a very\nmassive neutron star\, such as G
W190425.\n\nFinally\, I will comment on potential implications for the equ
ation of\nstate\, in case the secondary in GW190814 was (once) a neutron s
tar.\nFollowing up on the possibility of having low mass black holes in th
e\nlower mass gap\, I will present the results of an on-going study of\nne
ar equal mass black hole-neutron star mergers. In particular\, I will\nfoc
us on the impact of initial black hole spin on the viability for\nelectrom
agnetic counterparts.\n
DTSTART;TZID=America/New_York:20200928T123000
DTEND;TZID=America/New_York:20200928T123000
LAST-MODIFIED:20200925T184016Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/events/princeton-university-gravity-initiative-lunc
h-3
END:VEVENT
BEGIN:VEVENT
UID:a1604140-b37f-4d0a-ba3d-cd497b2f30b0
DTSTAMP:20201203T113921Z
CREATED:20200924T135827Z
DESCRIPTION:Topic: Racial Diversity and Underrepresentation in STEM\n\nSpea
kers: Shawn Maxam\n\nAffiliation: Princeton University\n\nWe are pleased t
o announce our Seminar Series on Equity\, Diversity and\nInclusion\, which
is JOINTLY HOSTED BY THE PHYSICS AND ASTROPHYSICS\nDEPARTMENTS.\n\nThis s
ession will provide an introductory overview of the\nunderrepresentation o
f racial minorities in STEM disciplines\nspecifically the natural sciences
. Best practices and strategies to\nenhance racial diversity and represent
ation will be discussed.\n\n * Overview of racial demographic data across h
igher education\nlandscape\n * Discussion of impacts of underrepresentation
on research and\nteaching mission\n * Review of best practices and strateg
ies to enhance racial diversity\nand representation\n * Q/A and open discus
sion\n\nShawn Maxam serves as Senior Associate Director for Institutional
\nDiversity and Inclusion in the Office of the Provost. In this role\, he
\nleads strategic partnerships and projects associated with campus\nclimat
e\, academic departments\, data analysis\, and history and sense of\nplace
\, among others. Shawn joined the Provost Office in 2016 as an\nAssistant
Director. He previously served as the Prevention Coordinator\nfor Men’s In
itiatives in Princeton’s University Health Services\nfrom 2014 to 2016. Sh
awn is deeply committed to board service and\neducational non profits. He
serves as a trustee for the Princeton\nBlairstown Center and the Lawrence
Township Education Fund. Shawn\nearned his BFA from Long Island University
and two Masters degrees\nfrom Bryn Mawr College in Social Service and Law
Social Policy.\n
DTSTART;TZID=America/New_York:20200929T160000
DTEND;TZID=America/New_York:20200929T170000
LAST-MODIFIED:20200925T184337Z
LOCATION:Virtual Event via Zoom
SUMMARY:Princeton University Joint Physics and Astrophysics Seminar Series
on Equity\, Diversity and Inclusion
URL:https://www.ias.edu/events/princeton-university-joint-physics-and-astro
physics-seminar-series-equity-diversity-and
END:VEVENT
BEGIN:VEVENT
UID:cb09189e-4247-47a1-a97c-d441a430064b
DTSTAMP:20201203T113921Z
CREATED:20200922T142358Z
DESCRIPTION:Topic: Statistical Mechanics of Near-BPS Black Holes from N=4 J
T Supergravity\n\nSpeakers: Matthew Heydeman\n\nAffiliation: Princeton Uni
versity\; Member\, School of Natural Sciences\n\nA basic challenge for any
theory of quantum gravity is to provide a\nmicroscopic accounting of the
degrees of freedom and partition\nfunctions of black holes. In string theo
ry\, an exact count is possible\nwhen the Hawking temperature T=0\, which
corresponds to extremal\nReissner-Nordstrom black holes BPS protected by s
upersymmetry. What\nhappens for T>0 is less clear\, including whether ther
e is a mass gap\nseparating extremal and non-extremal states.\n\nExtremal
black holes have an AdS2 region\, and substantial progress in\nthe last fe
w years has been made on Jackiw-Teitelboim (JT) dilaton\ngravity\, which i
s an effective theory of nearly AdS2 spacetimes\nappropriate for low T>0.
It has been shown that JT is\, in some sense\,\nexactly solvable using an
AdS/CFT dual boundary theory known as the\nSchwarzian.\n\nIn this talk\, w
e will extend the AdS2 JT dynamics to the case\nappropriate for four-dimen
sional near-BPS black holes. Starting with\n4D N=2 supergravity\, we consi
der nearly AdS2 x S2 black holes with\nenhanced N=4 superconformal isometr
ies. The effective description is a\n2D N=4 supersymmetric extension of JT
gravity dual to a supersymmetric\nSchwarzian. The density of near-BPS sta
tes may be computed exactly in\nthis theory. Our results agree with genera
l arguments from string\ntheory and JT gravity\, and we find the supersymm
etry leads to a mass\ngap above extremality.\n
DTSTART;TZID=America/New_York:20201005T123000
DTEND;TZID=America/New_York:20201005T123000
LAST-MODIFIED:20201002T190101Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/events/princeton-university-gravity-initiative-lunc
h-4
END:VEVENT
BEGIN:VEVENT
UID:646a4ed4-89e5-48d2-80f8-1cdad784225d
DTSTAMP:20201203T113921Z
CREATED:20200908T200627Z
DESCRIPTION:Topic: Towards a Microscopic Model of AdS Fragmentation\n\nSpea
kers: Tarek Anous\n\nAffiliation: University of Amsterdam\n\nTo join HET S
eminar please click link below:\n\nhttps://princeton.zoom.us/j/98595504817
?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09(link\nis external)\n[https://princet
on.zoom.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09]\n\nMeeting
ID: 985 9550 4817\nPasscode: 604268\nABSTRACT: A salient feature of black
holes near extremality is the\nappearance of an AdS2 throat in their near-
horizon geometry. Depending\non the underlying theory\, these AdS2 throats
may be unstable to\n_fragmentation\, wherein_ a single throat is instead
replaced by a\ntree-like structure of branched AdS2 throats. For Einstein-
Maxwell\ntheory\, the underlying reason behind this instability is the exi
stence\nof multi-centered configuration in the moduli space of black hole
\nsolutions at fixed total charge. Given the success of the\nSchwarzian/SY
K paradigm for understanding a single AdS2 it is time to\nrevisit the frag
mentation story. To build up intuition\, I will present\na model\, studied
in the statistical mechanics literature\, that shares\nmany features with
SYK\, including exact solvability at large-N and an\nemergent conformal s
ymmetry that gets weakly broken in the UV. The\nnovel feature of this mode
l is the appearance of a spin glass phase at\nO(1) temperatures\, which I
will try to relate to the fragmentation\nstory.\n
DTSTART;TZID=America/New_York:20201009T134500
DTEND;TZID=America/New_York:20201009T134500
LAST-MODIFIED:20201002T184318Z
LOCATION:via ZOOM
SUMMARY:Princeton University High Energy Theory Seminar
URL:https://www.ias.edu/events/princeton-university-high-energy-theory-semi
nar-6
END:VEVENT
BEGIN:VEVENT
UID:73a131e5-2cf1-4b5c-8271-a284ce48f69b
DTSTAMP:20201203T113921Z
CREATED:20200908T201219Z
DESCRIPTION:Topic: Exploring Supermassive Black Holes\n\nRegistration is op
en [https://forms.gle/mPmYTjZ6Cwhbkdgk6]\n\nSpeakers:\n\n * Fabio Antonini\
, Cardiff University\n * Manuela Campanelli\, RIT\n * Julie Comerford\, Univ
ersity of Colorado-Boulder\n * Suvi Gezari\, University of Maryland\n * Stef
fan Gillessen\, MAX PLANCK INSTITUTE (MPE)\n * Yuri Levin\, Columbia Univer
sity and Flat Iron Institute\, CCA\n * Xin Liu\, University of Illinois\n *
Chung-Pei Ma\, UC Berkeley\n * Brian Metzger\, Columbia university\n * Diego
Munoz\, Northwestern University (CIERA)\n * Smadar Naoz\, UCLA\n * Michael
Tremmel\, Yale\n * Karina Voggel\, Strasbourg Observatory\, France\n * Marta
Volonteri\, Institut d’Astrophysique de Paris (IAP)\n\nOrganizing committ
ee:\nFani Dosopoulou\, Jeremy Goodman\, Jenny Greene\, and James Stone\n
DTSTART;TZID=America/New_York:20201014T110000
DTEND;TZID=America/New_York:20201014T143000
LAST-MODIFIED:20201012T125814Z
LOCATION:via ZOOM
SUMMARY:Princeton Gravity Initiative - PCTS Workshop
URL:https://www.ias.edu/events/princeton-gravity-initiative-pcts-workshop
END:VEVENT
BEGIN:VEVENT
UID:b2dc5137-2c19-4fc6-bdd2-43c4fd04a2a1
DTSTAMP:20201203T113921Z
CREATED:20200908T201403Z
DESCRIPTION:Topic: Exploring Supermassive Black Holes\n\nRegistration is op
en [https://forms.gle/mPmYTjZ6Cwhbkdgk6]\n\nSpeakers:\n\n * Fabio Antonini\
, Cardiff University\n * Manuela Campanelli\, RIT\n * Julie Comerford\, Univ
ersity of Colorado-Boulder\n * Suvi Gezari\, University of Maryland\n * Stef
fan Gillessen\, MAX PLANCK INSTITUTE (MPE)\n * Yuri Levin\, Columbia Univer
sity and Flat Iron Institute\, CCA\n * Xin Liu\, University of Illinois\n *
Chung-Pei Ma\, UC Berkeley\n * Brian Metzger\, Columbia university\n * Diego
Munoz\, Northwestern University (CIERA)\n * Smadar Naoz\, UCLA\n * Michael
Tremmel\, Yale\n * Karina Voggel\, Strasbourg Observatory\, France\n * Marta
Volonteri\, Institut d’Astrophysique de Paris (IAP)\n\nOrganizing committ
ee:\nFani Dosopoulou\, Jeremy Goodman\, Jenny Greene\, and James Stone\n
DTSTART;TZID=America/New_York:20201015T110000
DTEND;TZID=America/New_York:20201015T143000
LAST-MODIFIED:20201012T125837Z
LOCATION:via ZOOM
SUMMARY:Princeton Gravity Initiative - PCTS Workshop
URL:https://www.ias.edu/events/princeton-gravity-initiative-pcts-workshop-0
END:VEVENT
BEGIN:VEVENT
UID:25e0e0c0-3a1d-4944-8cf4-a7da3d4b5bc5
DTSTAMP:20201203T113921Z
CREATED:20201012T131120Z
DESCRIPTION:Topic: Exploring Supermassive Black Holes\n\nSpeakers: Jenny Gr
eene\n\nAffiliation: Princeton University\n\nPRINCETON UNIVERSITY DEPARTME
NT OF PHYSICS _HAMILTON COLLOQUIUM\nSERIES_\n\nCOLLOQUIUM SPEAKER: JENNY G
REENE AND PANELISTS SUVI GEZARI\, BRIAN\nMETZGER AND MARTA VOLONTERI\n\nPr
inceton University\n12:15 P.M. EASTERN TIME\, THURSDAY\, OCT 15\, 2020\n\n
PANEL DISCUSSION WITH SUVI GEZARI\, BRIAN METZGER AND MARTA VOLONTERI\n\nT
his panel discussion accompanies the conference “Exploring\nSupermassive B
lack Holes”. We (Suvi Gezari\, Jenny Greene\, Brian\nMetzger\, Marta Volon
teri) will discuss the critical stages in the life\ncycle of black holes\,
from the formation of supermassive black hole\nseeds to growth via accret
ion and more extreme tidal disruption\nevents\, to the ongoing debate abou
t whether and how often supermassive\nblack holes merge. We will focus on
the new opportunities afforded by\ntime domain surveys with electro-magnet
ic and gravitational wave\ndetectors.\n\nRegistration is required. \n\nKin
dly register through the below Zoom Registration Link or click HERE\n[http
s://princeton.zoom.us/webinar/register/WN_fRZxsixVRnKlDBZwma4RKQ]:\n\n\nht
tps://princeton.zoom.us/webinar/register/WN_fRZxsixVRnKlDBZwma4RKQ\n\nTo r
equest disability-related accommodations\, kindly contact Susan\nSabatura
ssabatura@princeton.edu no later than three working days\nprior to the eve
nt.\n
DTSTART;TZID=America/New_York:20201015T121500
DTEND;TZID=America/New_York:20201015T121500
LAST-MODIFIED:20201023T153444Z
LOCATION:Zoom Webinar
SUMMARY:Princeton University Department of Physics Donald R. Hamilton Collo
quium Series
URL:https://www.ias.edu/events/princeton-university-department-physics-dona
ld-r-hamilton-colloquium-series-54
END:VEVENT
BEGIN:VEVENT
UID:dee700a4-d5e4-4bd2-8131-24cc29246d7b
DTSTAMP:20201203T113921Z
CREATED:20200908T201427Z
DESCRIPTION:Topic: Exploring Supermassive Black Holes\n\nRegistration is op
en [https://forms.gle/mPmYTjZ6Cwhbkdgk6]\n\nSpeakers:\n\n * Fabio Antonini\
, Cardiff University\n * Manuela Campanelli\, RIT\n * Julie Comerford\, Univ
ersity of Colorado-Boulder\n * Suvi Gezari\, University of Maryland\n * Stef
fan Gillessen\, MAX PLANCK INSTITUTE (MPE)\n * Yuri Levin\, Columbia Univer
sity and Flat Iron Institute\, CCA\n * Xin Liu\, University of Illinois\n *
Chung-Pei Ma\, UC Berkeley\n * Brian Metzger\, Columbia university\n * Diego
Munoz\, Northwestern University (CIERA)\n * Smadar Naoz\, UCLA\n * Michael
Tremmel\, Yale\n * Karina Voggel\, Strasbourg Observatory\, France\n * Marta
Volonteri\, Institut d’Astrophysique de Paris (IAP)\n\nOrganizing committ
ee:\nFani Dosopoulou\, Jeremy Goodman\, Jenny Greene\, and James Stone\n
DTSTART;TZID=America/New_York:20201016T110000
DTEND;TZID=America/New_York:20201016T140000
LAST-MODIFIED:20201016T135333Z
LOCATION:via ZOOM
SUMMARY:Princeton Gravity Initiative - PCTS Workshop
URL:https://www.ias.edu/events/princeton-gravity-initiative-pcts-workshop-1
END:VEVENT
BEGIN:VEVENT
UID:6520ba76-93ea-4d57-8901-096405060837
DTSTAMP:20201203T113921Z
CREATED:20200922T142514Z
DESCRIPTION:Topic: Gravitational Test beyond the First Post-Newtonian Order
with the EHT\n\nSpeakers: Lia Medeiros\n\nAffiliation: Member\, School of
Natural Sciences\n\nOur current understanding of black holes assumes that
they are\ndescribed by the Kerr solution to Einstein's equations. On Apri
l 10\,\n2019\, the Event Horizon Telescope (EHT)\, released the first imag
e of a\nblack hole resolved to event horizon scales and the first measurem
ent\nof the size of a black-hole shadow. In October of 2020 we published a
\nnew test of general relativity at the 2PN order based on this\nmeasureme
nt. I will discuss how we can use the Event Horizon Telescope\nto test the
Kerr nature of black holes\, both with this first image and\nin the futur
e.\n
DTSTART;TZID=America/New_York:20201019T123000
DTEND;TZID=America/New_York:20201019T123000
LAST-MODIFIED:20201009T182950Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/events/princeton-university-gravity-initiative-lunc
h-5
END:VEVENT
BEGIN:VEVENT
UID:1de8f5dd-0a78-4e8c-9c90-c9199f7bf430
DTSTAMP:20201203T113921Z
CREATED:20200909T190854Z
DESCRIPTION:Topic: The fast conformal bootstrap and sphere packing in high
dimensions\n\nSpeakers: Amirhossein Tajdini\n\nAffiliation: University of
California\, Santa Barbara\n\nTo join HET Seminar please click link below:
\n\nhttps://princeton.zoom.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvaj
VNQT09(link\nis external)\n[https://princeton.zoom.us/j/98595504817?pwd=QW
xDMzFGWjdBdmVBRTFyQmtvajVNQT09]\n\nMeeting ID: 985 9550 4817\nPasscode: 60
4268\nAbstract: The conformal bootstrap program seeks to map the space of
\npossible conformal field theories and to identify those on the\nboundary
of theory space. In this talk\, I will discuss a numerical\nmethod that i
s applicable to certain bootstrap problems\, such as the\nspinless modular
bootstrap in two dimensions. This method extends the\nconformal bootstrap
to the regime of large central charge which is\nrelevant to three-dimensi
onal gravity. The same method applies to the\nsphere packing problem and g
ives new bounds on the packing density in\nhigh dimensions. I will talk ab
out these new bounds and give a summary\nof existing bounds. I will also t
alk about bootstrapping four-point\nfunctions on a plane by using the fast
bootstrap method.\n
DTSTART;TZID=America/New_York:20201019T143000
DTEND;TZID=America/New_York:20201019T143000
LAST-MODIFIED:20201013T143255Z
LOCATION:via ZOOM
SUMMARY:Princeton University High Energy Theory Seminar
URL:https://www.ias.edu/events/princeton-university-high-energy-theory-semi
nar-7
END:VEVENT
BEGIN:VEVENT
UID:ebeb7804-6b0e-49d6-8834-8d79be6187f7
DTSTAMP:20201203T113921Z
CREATED:20200909T191037Z
DESCRIPTION:Topic: Derivation of AdS/CFT for Vector Models\n\nSpeakers: Sha
i Chester\n\nAffiliation: Weizmann Institute\n\nTo join HET Seminar please
click link below:\n\nhttps://princeton.zoom.us/j/98595504817?pwd=QWxDMzFG
WjdBdmVBRTFyQmtvajVNQT09(link\nis external)\n[https://princeton.zoom.us/j/
98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09]\n\nMeeting ID: 985 9550
4817\nPasscode: 604268\nAbstract: We derive an explicit map between the si
nglet sector of the\nfree and critical O(N) and U(N) vector models in any
spacetime\ndimension above two and to all orders in 1/N\, and a bulk highe
r spin\ntheory in anti-de Sitter space in one higher dimension. For the\nb
oundary theory\, we use the bilocal formalism of Jevicki et al to\nrestric
t to the singlet sector of the vector model. The bulk theory is\ndefined f
rom the boundary theory via our mapping and is a consistent\nquantum highe
r spin theory with a well defined action. Our mapping\nrelates bilocal ope
rators in the boundary theory to higher spin fields\nin the bulk\, while s
ingle trace local operators in the boundary theory\nare related to boundar
y values of higher spin fields.\n
DTSTART;TZID=America/New_York:20201023T134500
DTEND;TZID=America/New_York:20201023T134500
LAST-MODIFIED:20201021T155550Z
LOCATION:via ZOOM
SUMMARY:Princeton University High Energy Theory Seminar
URL:https://www.ias.edu/events/princeton-university-high-energy-theory-semi
nar-8
END:VEVENT
BEGIN:VEVENT
UID:015c4918-9b94-44c1-8182-83e915c4c8e0
DTSTAMP:20201203T113921Z
CREATED:20200922T142638Z
DESCRIPTION:Topic: Naked Singularities for the Einstein Vacuum Equations: T
he Exterior Solution\n\nSpeakers: Yakov Shlapentokh-Rothman\n\nAffiliation
: Princeton University\n\nAbstract: We will start by recalling the weak co
smic censorship\nconjecture. Then we will review Christodoulou's construc
tion of\nnaked singularities for the spherically symmetric Einstein-scalar
\nfield system. Finally\, we will discuss joint work with Igor\nRodnianski
which constructs spacetimes corresponding to the exterior\nregion of a na
ked singularity for the Einstein vacuum equations.\n
DTSTART;TZID=America/New_York:20201026T123000
DTEND;TZID=America/New_York:20201026T123000
LAST-MODIFIED:20201023T123555Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/events/princeton-university-gravity-initiative-lunc
h-6
END:VEVENT
BEGIN:VEVENT
UID:2b8ea7df-088d-4d95-a3f2-2e9139dfcf4c
DTSTAMP:20201203T113921Z
CREATED:20201016T191016Z
DESCRIPTION:Topic: Explosive Neutron Stars\n\nSpeakers: Andrei Beloborodov
\n\nAffiliation: Columbia University\n\n[Image provided by Andrei Beloboro
dov]\n\nNeutron stars are by far the strongest known magnets in the univer
se.\nSome of them (called magnetars) generate explosions by suddenly\ndiss
ipating magnetic energy with a rate up to 10471047 erg/s. These\nmagnetic
explosions emit giant gamma-ray flares observed in our and\nneighboring ga
laxies. Similar explosions in distant galaxies are\nproposed as the engine
s of the mysterious fast radio bursts (FRBs).\nYet more powerful energy re
lease occurs when two neutron stars merge.\nThese cataclysmic events produ
ce gravitational waves\, neutrinos\, and\nbright electromagnetic emission.
Both mergers and isolated magnetar\nflares involve ultra-strong magnetic
fields of 1015−10161015−1016\nG\, sudden heating to MeV temperatures\, cre
ation of copious\nelectron-positron pairs\, and launching of ultra-relativ
istic outflows\nand shock waves. Recent numerical experiments shed light o
n the\nextreme plasma physics in these events\, in particular the dissipat
ion\nmechanisms releasing the observed energy. Observations and simulation
s\nof the ultra-powerful bursts also provide insights into neutron star\ni
nterior.\n\nClick Here to Register\n[https://princeton.zoom.us/webinar/reg
ister/WN__Hkr-nJ5RoqyVfoxFrVRlw]\n\nTwitter: #PrincetonPhyColloq\n\n
DTSTART;TZID=America/New_York:20201029T120000
DTEND;TZID=America/New_York:20201029T120000
LAST-MODIFIED:20201016T191016Z
LOCATION:Zoom Webinar
SUMMARY:Princeton University Department of Physics Donald R. Hamilton Collo
quium Series
URL:https://www.ias.edu/events/princeton-university-department-physics-dona
ld-r-hamilton-colloquium-series-55
END:VEVENT
BEGIN:VEVENT
UID:2a65d57b-0c3e-4d0a-af23-a2fc72bbedf0
DTSTAMP:20201203T113921Z
CREATED:20201027T135501Z
DESCRIPTION:Topic: Some singular spacetimes in general relativity\n\nSpeake
rs: Jonathan Wing-hong Luk\n\nAffiliation: Stanford University\n\nAbstract
: I will describe a few classes of solutions to the Einstein\nequations wh
ose metrics are singular or highly oscillatory\, and\ndiscuss the relation
between them. The singular solutions include as\nspecial examples impulsi
ve gravitational waves and null dust shell\nsolutions. In particular\, I w
ill present a mathematical theory\,\nobtained in collaboration with Igor R
odnianski\, for the initial value\nproblem describing the propagation and
interaction of impulsive\ngravitational waves\, null dust shells\, and oth
er singular structures.\n
DTSTART;TZID=America/New_York:20201102T123000
DTEND:
LAST-MODIFIED:20201103T163612Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
lunch
END:VEVENT
BEGIN:VEVENT
UID:91194b7c-bf90-4faa-b87c-b263681bddb3
DTSTAMP:20201203T113921Z
CREATED:20200909T191326Z
DESCRIPTION:Topic: 2-Group Global Symmetries in Six Dimensions\n\nSpeakers:
Thomas Dumitrescu\n\nAffiliation: University of California\, Los Angeles
\n\nTo join HET Seminar please click link below:\n\nhttps://princeton.zoom
.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09(link\nis external)
\n[https://princeton.zoom.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajV
NQT09]\n\nMeeting ID: 985 9550 4817\nPasscode: 604268\n\nABSTRACT: I will
review the notion of (continuous) 2-group global\nsymmetries\, which mix o
rdinary and higher-form global symmetries\, and\nexplain why they naturall
y arise in many 6d gauge theories. Most 6d\nSCFTs and little string theori
es have weakly-coupled infrared phases\nwith gauge fields. While non-trivi
al 2-group symmetries are often\npresent in little string theories\, I wil
l explain why they can never\narise in unitary SCFTs. This observation can
be used to establish a\npreviously conjectured algorithm for computing ’t
Hooft anomalies of\nsuch SCFTs. Finally\, I will use this understanding t
o shed light on\nthe a-theorem in six dimensions. In particular\, I will s
how that all\nunitary 6d SCFTs have positive a-anomaly.\n
DTSTART;TZID=America/New_York:20201102T143000
DTEND;TZID=America/New_York:20201102T143000
LAST-MODIFIED:20201030T133311Z
LOCATION:via ZOOM
SUMMARY:Princeton University High Energy Theory Seminar
URL:https://www.ias.edu/events/princeton-university-high-energy-theory-semi
nar-9
END:VEVENT
BEGIN:VEVENT
UID:37cc2a07-b115-4aa6-99d6-96c87f5e2596
DTSTAMP:20201203T113921Z
CREATED:20201016T191218Z
DESCRIPTION:Topic: Choreographing Quantum Spin Dynamics with Light\n\nSpeak
ers: Monika Schleier-Smith\n\nAffiliation: Stanford University\n\n[Image p
rovided by Monika Schleier-Smith]\n\nThe power of quantum information lies
in its capacity to be non-local\,\nencoded in correlations among two\, th
ree\, or many entangled\nparticles. Yet our ability to produce\, understa
nd\, and exploit such\ncorrelations is hampered by the fact that the inter
actions between\nparticles and ordinarily local. I will report on experi
ments in\nwhich we use light to induce non-local interactions among cold a
toms\,\nwith photons acting as messengers conveying information between\nt
hem. Advances in programming the form and graph of interactions\nwith opt
ical and magnetic fields are opening new opportunities in\nareas ranging f
rom quantum technologies to fundamental physics. I\nwill touch on prospec
ts in quantum-enhanced sensing\, combinatorial\noptimization\, and simulat
ing toy models of quantum gravity. \n
DTSTART;TZID=America/New_York:20201105T120000
DTEND;TZID=America/New_York:20201105T120000
LAST-MODIFIED:20201103T164230Z
LOCATION:Zoom Webinar
SUMMARY:Princeton University Department of Physics Donald R. Hamilton Collo
quium Series
URL:https://www.ias.edu/events/princeton-university-department-physics-dona
ld-r-hamilton-colloquium-series-56
END:VEVENT
BEGIN:VEVENT
UID:dc303a9a-17ae-451c-ae68-fa29ed871d79
DTSTAMP:20201203T113921Z
CREATED:20200909T191502Z
DESCRIPTION:Topic: Yangians and other algebras you can find at boundaries a
nd interfaces\n\nSpeakers: Mykola Dedushenko\n\nAffiliation: SCGP\, Stony
Brook\n\nTo join HET Seminar please click link below:\n\nhttps://princeton
.zoom.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09\n\nMeeting ID:
985 9550 4817\nPasscode: 604268\n\nABSTRACT: I will discuss protected sec
tors in the 4d N=4 SYM with the\nhalf-BPS boundary or interface. Algebraic
structures of various levels\nof complexity appear in this context\, such
as U(g) (universal\nenveloping algebra)\, W(g\,e) (fintie W-algebra)\, th
eir quantum\nHamiltonian reductions\, and the Yangian (or rather its trunc
ation).\nOne can use the power of algebra\, as well as integrability in th
e\nlatter case\, to solve for correlation functions. In particular\, for a
n\ninterface engineered by a pair of fivebranes\, one can leverage\nconnec
tion to the inhomogeneous XXX spin chain to compute correlators\nquite exp
licitly.\nBased on 2009.11197 and 2009.11198.\n
DTSTART;TZID=America/New_York:20201106T134500
DTEND;TZID=America/New_York:20201106T134500
LAST-MODIFIED:20201103T164545Z
LOCATION:via ZOOM
SUMMARY:Princeton University High Energy Theory Seminar
URL:https://www.ias.edu/events/princeton-university-high-energy-theory-semi
nar-10
END:VEVENT
BEGIN:VEVENT
UID:2b454344-4de8-4b36-9031-d3e338d049ff
DTSTAMP:20201203T113921Z
CREATED:20201103T200840Z
DESCRIPTION:Topic: Constraining the Neutron Star Equation of State with Gra
vitational Wave Events\n\nSpeakers: Carolyn Raithel\n\nAffiliation: IAS/PC
TS/PGI\n\nABSTRACT: Detections of gravitational waves from binary neutron
star\nmergers offer an exciting\, new approach to constraining the equatio
n\nof state (EOS) of ultra-dense matter. In this talk\, I will summarize\n
what we have learned about the EOS from the first binary neutron star\nmer
gers and what we might hope to learn from future events. I will\nstart by
discussing a new one-to-one mapping between the tidal\ndeformability measu
red from a neutron star merger and the stellar\nradius\, and I will compar
e the radius that was inferred from GW170817\nto previous X-ray measuremen
ts of neutron star radii. I will also\npresent new constraints on the nucl
ear symmetry energy from GW170817\,\nwhich point to smaller values than ar
e typically found in\nlaboratory-based nuclear experiments\, and which rei
nforce the radius\nconstraints. In the final part of the talk\, I will int
roduce a\nframework for extending models of the cold EOS to arbitrary\ntem
peratures and compositions\, which will enable us to disentangle the\nrole
of thermal effects from the underlying cold EOS in future\nanalyses of gr
avitational wave events. I will finish with some\npreliminary results from
a set of merger simulations that explore the\nparameter space of this new
framework.\n
DTSTART;TZID=America/New_York:20201109T123000
DTEND:
LAST-MODIFIED:20201103T210602Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
lunch-0
END:VEVENT
BEGIN:VEVENT
UID:0b60a18b-6243-41a5-976e-37ce2e5bea64
DTSTAMP:20201203T113921Z
CREATED:20201105T181552Z
DESCRIPTION:Topic: The Search for Fractional Statistics\n\nSpeakers: Charle
s M Marcus\n\nAffiliation: Niels Bohr Institute\n\nPanel discussion with D
uncan Haldane (Princeton)\, Michael Manfra\n(Purdue) and Gwendal Feve (ENS
)\n\nThe possibility of particles with fractional statistics intermediate
\nbetween those of fermions and bosons in two dimensional systems was\nrai
sed as early as 1976 in theoretical work by Leinaas and Myrheim and\nindep
endently by Wilczek. In the context of the quantum hall effect\nthe existe
nce of such anyons was proposed by Arovas\, Wilczek and\nSchrieffer and Ha
lperin and analyzed by Haldane who gave a distinct\nformulation of the ide
a. While by 1984 theorists were convinced that\nsuch particle existed in q
uantum hall systems\, their actual\nobservation has only recently become a
reality in landmark experiments\nby groups of Manfra and Feve. Our paneli
sts will discuss this\nintellectual history and the experiments and the st
atus of the broader\nset of searches for particles with fractional statist
ics\, especially\nthose with non-Abelian statistics.\n
DTSTART;TZID=America/New_York:20201112T120000
DTEND;TZID=America/New_York:20201112T120000
LAST-MODIFIED:20201105T184939Z
LOCATION:Zoom Webinar
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
END:VEVENT
BEGIN:VEVENT
UID:22f1706e-945d-4181-9661-54a115a3ca28
DTSTAMP:20201203T113921Z
CREATED:20201103T201214Z
DESCRIPTION:Topic: Where are BMS Symmetries in the Flat Limit of AdS/CFT?\n
\nSpeakers: Eliot Hijano Cubelos\n\nAffiliation: Princeton University\n\nA
BSTRACT: A holographic description of physics in Minkowski space is\nstill
elusive. A tempting approach is to implement a flat limit from\nAdS/CFT.
Such a limit has not properly been understood\, even at the\nlevel of the
symmetries of the theory\; How do BMS symmetries emerge\nfrom the flat lim
it of the asymptotic symmetries of anti-de Sitter\nspace-time? In this tal
k I will discuss some interesting results that\nattempt to answer this que
stion. I will also set up a roadmap to find\ngenerators of BMS symmetry in
a conformal field theory.\n
DTSTART;TZID=America/New_York:20201116T123000
DTEND:
LAST-MODIFIED:20201110T152123Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
lunch-1
END:VEVENT
BEGIN:VEVENT
UID:f357cc15-2e33-4487-8e18-7d2b3ec6d5e2
DTSTAMP:20201203T113921Z
CREATED:20201112T210916Z
DESCRIPTION:Topic: Quantum Error Correction and Large N\n\nSpeakers: Alexey
Milekhin\n\nAffiliation: University of California\, Santa Barbara\n\nTo j
oin HET Seminar\, please click link below: \n\nhttps://princeton.zoom.us
/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09 \n\nMeeting ID: 985
9550 4817\nPasscode: 604268 \n\nABSTRACT: In recent years quantum error c
orrection (QEC) has become\nan important part of AdS/CFT. Unfortunately\,
there are no\nfield-theoretic arguments about why QEC holds in known holog
raphic\nsystems. The purpose of this talk is to fill this gap by studying
the\nerror correcting properties of the fermionic sector of various large
N\ntheories. Specifically\, we examine SU(N) matrix quantum mechanics and
\n3-rank tensor O(N)^3 theories. Both of these theories contain large\ngau
ge groups. We argue that gauge singlet states indeed form a quantum\nerror
correcting code. Our considerations are based purely on large N\nanalysis
and do not appeal to a particular form of Hamiltonian or\nholography.\n
DTSTART;TZID=America/New_York:20201116T143000
DTEND:
LAST-MODIFIED:20201112T211038Z
LOCATION:via ZOOM
SUMMARY:Princeton University High Energy Theory Seminar
URL:https://www.ias.edu/events/princeton-university-high-energy-theory-semi
nar-12
END:VEVENT
BEGIN:VEVENT
UID:0c120ec6-ae36-415b-8442-6fd70e41d529
DTSTAMP:20201203T113921Z
CREATED:20201105T185155Z
DESCRIPTION:Topic: The String Landscape and the Swampland\n\nSpeakers: Cumr
un Vafa\n\nAffiliation: Harvard University\n\nZoom Link: Click Here to Joi
n\n[https://princeton.zoom.us/j/99804652145]\n\nABSTRACT: String theory la
ndscape of vacua point to new consistency\nconditions that a quantum gravi
tational system must satisfy. There\nare only a small number of quantum f
ield theories that satisfy these\nconditions and all the rest belong to th
e `Swampland' which cannot be\nconsistently coupled to gravity. In this t
alk I review some of these\nconditions and their implications for cosmolog
y and particle physics.\n
DTSTART;TZID=America/New_York:20201119T120000
DTEND;TZID=America/New_York:20201119T120000
LAST-MODIFIED:20201110T152334Z
LOCATION:Zoom Webinar
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-0
END:VEVENT
BEGIN:VEVENT
UID:1dcd4bf4-f63f-486d-9d15-d8c518540ea7
DTSTAMP:20201203T113921Z
CREATED:20201103T201522Z
DESCRIPTION:Topic: The Merger History of Elliptical Galaxies: Mass Deficit
\n\nSpeakers: Fani Dosopoulou\n\nAffiliation: Princeton University\n\nABST
RACT: The structure and kinematics of galactic nuclei are fossil\nrelics o
f the merger histories of galaxies and of the interaction\nbetween stars a
nd SMBH binaries. Stars ejection during the SMBH binary\nevolution should
reduce a galaxy’s central density and expand its\ncore. This has been sugg
ested as a plausible explanation for why large\nelliptical galaxies have l
ower central densities and weaker density\ncusps than small ellipticals. A
n important element that determines the\neffect of a massive binary on a g
alactic core is the time it takes for\nthe binary separation to decay to t
he regime where GW emission will\ntake over. But whether or not a massive
binary manages to coalesce\,\nit will leave behind an imprint on both the
mass density and\nkinematics of the galaxy: (i) a mass deficit - a lowered
density of\nstars near the centre of the galaxy\; (ii) a tangentially ani
sotropic\nvelocity distribution - an excess of stars in the core moving al
ong\ntangential directions. I use N-body simulations to simulate the merge
r\nof two galaxies and study the destruction of density cusps around\nSMBH
s in multiple mergers of elliptical galaxies. I follow the details\nof the
merger from its earliest stages\, when the two galaxies are\ndistinct\, t
o its late stages\, when the SMBHs have formed a hard binary\nand the bina
ry has decayed via energy exchange with stars to the GW\ndominated regime.
I present the morphological and kinematical\nstructure of the merged gala
xy as a function of the merger mass-ratio\,\nthe galaxy density profile sl
ope and the number of mergers and discuss\nobservational signatures associ
ated with the formation picture.\n
DTSTART;TZID=America/New_York:20201123T123000
DTEND:
LAST-MODIFIED:20201120T142602Z
LOCATION:via ZOOM
SUMMARY:Princeton University Gravity Initiative Lunch
URL:https://www.ias.edu/sns/events/princeton-university-gravity-initiative-
lunch-2
END:VEVENT
BEGIN:VEVENT
UID:2edae49f-f182-4e52-970c-f987b8e96c9a
DTSTAMP:20201203T113921Z
CREATED:20200909T191606Z
DESCRIPTION:Topic: Solving Unitarity with Contraction Mappings\n\nSpeakers:
Alexander Zhiboedov\n\nAffiliation: CERN\n\nTo join HET Seminar please cl
ick link below:\n\nhttps://princeton.zoom.us/j/98595504817?pwd=QWxDMzFGWjd
BdmVBRTFyQmtvajVNQT09\n\nMeeting ID: 985 9550 4817\nPasscode: 604268\nAbst
ract: I will discuss the problem of constructing relativistic\,\nunitary\,
and crossing-symmetric scattering amplitudes in\nhigher-dimensional gappe
d theories. I will review the implications of\nelastic unitarity and cross
ing\, as well as the observation that the\nresulting structure can be nonp
erturbatively realized using the\ncontraction mapping theorem. I will repo
rt on the numerical\nimplementation of the idea of solving unitarity with
contraction\nmappings in a simplified context of 2d S-matrices. \n
DTSTART;TZID=America/New_York:20201204T134500
DTEND:
LAST-MODIFIED:20201130T155625Z
LOCATION:via ZOOM
SUMMARY:Princeton University High Energy Theory Seminar
URL:https://www.ias.edu/events/princeton-university-high-energy-theory-semi
nar-11
END:VEVENT
END:VCALENDAR