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BEGIN:VEVENT
SUMMARY:Gustavo Joaquin Turiaci (UCSB)
DTSTART;VALUE=DATE-TIME:20200921T183000Z
DTEND;VALUE=DATE-TIME:20200921T193000Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/1
DESCRIPTION:Title: Th
e gravitational path integral near extremality\nby Gustavo Joaquin Tur
iaci (UCSB) as part of Princeton HET seminar\n\n\nAbstract\nI will explain
the relation between the Euclidean path integral over near-extremal black
hole geometries and its dimensional reduction to 2D Jackiw-Teitelboim gra
vity. I will focus mostly on the case of 3D gravity and a particular appli
cation to pure 3D gravity. I will also mention a connection between more g
eneral 2D dilaton-gravity theories\, matrix integrals and the minimal stri
ng.\n
LOCATION:https://researchseminars.org/talk/PUHET/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oscar Varela (USU)
DTSTART;VALUE=DATE-TIME:20200925T174500Z
DTEND;VALUE=DATE-TIME:20200925T184500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/2
DESCRIPTION:Title: Ad
S4/CFT3 Squashed\, Stretched\, Warped and Invaded\nby Oscar Varela (US
U) as part of Princeton HET seminar\n\n\nAbstract\nThe spectrum of single-
trace operators of holographic CFTs at strong coupling and large N can be
mapped to the spectrum of Kaluza-Klein modes over the dual AdS supergravit
y solutions. In this talk\, I will focus on two specific CFT3s with AdS4xS
7 gravity duals that arise as infrared fixed points of the ABJM M2-brane f
ield theory deformed with a certain quadratic and a certain cubic superpot
ential. In both cases\, the AdS4xS7 product is warped and the metric on S7
is squashed and stretched. In the quadratic case\, I will show how Except
ional Field Theory techniques can be used to compute the entire spectrum.
In the cubic case\, I will show that the spectrum exhibits a space-invader
s scenario\, similar to that known to occur for another squashed AdS4xS7 s
olution.\n
LOCATION:https://researchseminars.org/talk/PUHET/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tarek Anous (University of Amsterdam)
DTSTART;VALUE=DATE-TIME:20201009T174500Z
DTEND;VALUE=DATE-TIME:20201009T184500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/3
DESCRIPTION:Title: To
wards a microscopic model of AdS fragmentation\nby Tarek Anous (Univer
sity of Amsterdam) as part of Princeton HET seminar\n\n\nAbstract\nA salie
nt feature of black holes near extremality is the appearance of an AdS$_2$
throat in their near-horizon geometry. Depending on the underlying theory
\, these AdS$_2$ throats may be unstable to fragmentation\, wherein a sin
gle throat is instead replaced by a tree-like structure of branched AdS$_2
$ throats. For Einstein-Maxwell theory\, the underlying reason behind this
instability is the existence of multi-centered configuration in the modul
i space of black hole solutions at fixed total charge. Given the success o
f the Schwarzian/SYK paradigm for understanding a single AdS$_2$ it is tim
e to revisit the fragmentation story. To build up intuition\, I will prese
nt a model\, studied in the statistical mechanics literature\, that shares
many features with SYK\, including exact solvability at large-N and an em
ergent conformal symmetry that gets weakly broken in the UV. The novel fea
ture of this model is the appearance of a spin glass phase at O(1) tempera
tures\, which I will try to relate to the fragmentation story.\n
LOCATION:https://researchseminars.org/talk/PUHET/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Amirhossein Tajdini (UCSB)
DTSTART;VALUE=DATE-TIME:20201019T183000Z
DTEND;VALUE=DATE-TIME:20201019T193000Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/4
DESCRIPTION:Title: Th
e fast conformal bootstrap and sphere packing in high dimensions\nby A
mirhossein Tajdini (UCSB) as part of Princeton HET seminar\n\n\nAbstract\n
The conformal bootstrap program seeks to map the space of possible conform
al field theories and to identify those on the boundary of theory space. I
n this talk\, I will discuss a numerical method that is applicable to cert
ain bootstrap problems\, such as the spinless modular bootstrap in two dim
ensions. This method extends the conformal bootstrap to the regime of larg
e central charge which is relevant to three-dimensional gravity. The same
method applies to the sphere packing problem and gives new bounds on the p
acking density in high dimensions. I will talk about these new bounds and
give a summary of existing bounds. I will also talk about bootstrapping fo
ur-point functions on a plane by using the fast bootstrap method.\n
LOCATION:https://researchseminars.org/talk/PUHET/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shai Chester (Weizmann)
DTSTART;VALUE=DATE-TIME:20201023T174500Z
DTEND;VALUE=DATE-TIME:20201023T184500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/5
DESCRIPTION:Title: De
rivation of AdS/CFT for Vector Models\nby Shai Chester (Weizmann) as p
art of Princeton HET seminar\n\n\nAbstract\nWe derive an explicit map betw
een the singlet sector of the free and critical O(N) and U(N) vector model
s in any spacetime dimension above two and to all orders in 1/N\, and a bu
lk higher spin theory in anti-de Sitter space in one higher dimension. For
the boundary theory\, we use the bilocal formalism of Jevicki et al to re
strict to the singlet sector of the vector model. The bulk theory is defin
ed from the boundary theory via our mapping\, and is a consistent quantum
higher spin theory with a well defined action. Our mapping relates bilocal
operators in the boundary theory to higher spin fields in the bulk\, whil
e single trace local operators in the boundary theory are related to bound
ary values of higher spin fields.\n
LOCATION:https://researchseminars.org/talk/PUHET/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Dumitrescu (UCLA)
DTSTART;VALUE=DATE-TIME:20201102T193000Z
DTEND;VALUE=DATE-TIME:20201102T203000Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/6
DESCRIPTION:Title: 2-
Group Symmetries in Six Dimensions\nby Thomas Dumitrescu (UCLA) as par
t of Princeton HET seminar\n\n\nAbstract\nI will review the notion of (con
tinuous) 2-group global symmetries\, which mix ordinary and higher-form gl
obal symmetries\, and explain why they naturally arise in many 6d gauge th
eories. Most 6d SCFTs and little string theories have weakly-coupled infra
red phases with gauge fields. While non-trivial 2-group symmetries are oft
en present in little string theories\, I will explain why they can never a
rise in unitary SCFTs. This observation can be used to establish a previou
sly conjectured algorithm for computing ’t Hooft anomalies of such SCFTs
. Finally\, I will use this understanding to shed light on the a-theorem i
n six dimensions. In particular I will show that all unitary 6d SCFTs have
positive a-anomaly.\n
LOCATION:https://researchseminars.org/talk/PUHET/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mykola Dedushenko (SCGP)
DTSTART;VALUE=DATE-TIME:20201106T184500Z
DTEND;VALUE=DATE-TIME:20201106T194500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/7
DESCRIPTION:Title: Ya
ngians and other algebras you can find at boundaries and interfaces\nb
y Mykola Dedushenko (SCGP) as part of Princeton HET seminar\n\n\nAbstract\
nI will discuss protected sectors in the 4d N=4 SYM with the half-BPS boun
dary or interface. Algebraic structures of various levels of complexity ap
pear in this context\, such as U(g) (universal enveloping algebra)\, W(g\,
e) (fintie W-algebra)\, their quantum Hamiltonian reductions\, and the Yan
gian (or rather its truncation). One can use the power of algebra\, as wel
l as integrability in the latter case\, to solve for correlation functions
. In particular\, for an interface engineered by a pair of fivebranes\, on
e can leverage connection to the inhomogeneous XXX spin chain to compute c
orrelators quite explicitly.\nBased on 2009.11197 and 2009.11198.\n
LOCATION:https://researchseminars.org/talk/PUHET/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexey Milekhin (Princeton)
DTSTART;VALUE=DATE-TIME:20201116T193000Z
DTEND;VALUE=DATE-TIME:20201116T203000Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/8
DESCRIPTION:Title: Qu
antum error correction and large N\nby Alexey Milekhin (Princeton) as
part of Princeton HET seminar\n\n\nAbstract\nIn recent years quantum error
correction (QEC) has become an important part of AdS/CFT. Unfortunately\,
there are no field-theoretic arguments about why QEC holds in known holog
raphic systems. The purpose of this talk is to fill this gap by studying t
he error correcting properties of the fermionic sector of various large N
theories. Specifically we examine SU(N) matrix quantum mechanics and 3-ran
k tensor O(N)^3 theories. Both of these theories contain large gauge group
s. We argue that gauge singlet states indeed form a quantum error correcti
ng code. Our considerations are based purely on large N analysis and do no
t appeal to a particular form of Hamiltonian or holography.\n
LOCATION:https://researchseminars.org/talk/PUHET/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Zhiboedov (CERN)
DTSTART;VALUE=DATE-TIME:20201204T184500Z
DTEND;VALUE=DATE-TIME:20201204T194500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/10
DESCRIPTION:Title: S
olving unitarity with contraction mappings\nby Alexander Zhiboedov (CE
RN) as part of Princeton HET seminar\n\n\nAbstract\nI will discuss the pro
blem of constructing relativistic\, unitary and crossing-symmetric\nscatte
ring amplitudes in higher-dimensional gapped theories. I will review the i
mplications of \nelastic unitarity and crossing\, as well as the observati
on that the resulting structure can be nonperturbatively realized\nusing t
he contraction mapping theorem. I will report on the numerical implementat
ion of the idea of solving unitarity\nwith contraction mappings in a simpl
ified context of 2d S-matrices.\n
LOCATION:https://researchseminars.org/talk/PUHET/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Lupsasca (Princeton Gravity Initiative)
DTSTART;VALUE=DATE-TIME:20210212T184500Z
DTEND;VALUE=DATE-TIME:20210212T194500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/11
DESCRIPTION:Title: T
he Black Hole Photon Ring\nby Alex Lupsasca (Princeton Gravity Initiat
ive) as part of Princeton HET seminar\n\n\nAbstract\nThe photon ring is a
narrow ring-shaped feature\, predicted by GR but not yet observed\, that a
ppears on images of sources near a black hole. It is caused by extreme ben
ding of light within a few Schwarzschild radii of the event horizon and pr
ovides a direct probe of the unstable bound photon orbits of the Kerr geom
etry. I will review the origin and structure of the photon ring\, before d
iscussing the prospects for its future detection. I will argue that the pr
ecise shape of the observable photon ring is remarkably insensitive to the
astronomical source profile and can therefore be used as a stringent test
of GR. A space-based interferometry experiment targeting the photon ring
of M87* could test the Kerr nature of the source to the sub-sub-percent le
vel.\n
LOCATION:https://researchseminars.org/talk/PUHET/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ying-Hsuan Lin (Harvard)
DTSTART;VALUE=DATE-TIME:20210222T193000Z
DTEND;VALUE=DATE-TIME:20210222T203000Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/12
DESCRIPTION:Title: L
orentzian Dynamics and Factorization Beyond Rationality\nby Ying-Hsuan
Lin (Harvard) as part of Princeton HET seminar\n\n\nAbstract\nI motivate
my talk with three questions in (1+1)d CFT: (1) What is the interpretation
of correlators in neither Euclidean nor Lorentzian regime? (2) Is there a
connection between Lorentzian dynamics and line operators? (3) Can the Ve
rlinde algebra be made sense of in irrational theories? I will argue that
the answer to (3) is "yes"\, and via (2) this "algebra" can put nontrivial
unitarity bounds ("opacity bound") on the conformal Regge limit of four-p
oint functions. Topological defect lines play a key role in this story. Mo
re details can be found in my paper 2012.01429.\n
LOCATION:https://researchseminars.org/talk/PUHET/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scott Collier (PCTS)
DTSTART;VALUE=DATE-TIME:20210226T184500Z
DTEND;VALUE=DATE-TIME:20210226T194500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/13
DESCRIPTION:Title: C
omments on the Narain ensemble of free CFTs\nby Scott Collier (PCTS) a
s part of Princeton HET seminar\n\n\nAbstract\nI will discuss the spectral
statistics of primary operators in the recently formulated ensemble avera
ge of Narain's family of free boson CFTs\, which provides an explicit (tho
ugh rather exotic) example of an averaged AdS$_3$/CFT$_2$ holographic dual
ity. I will focus on the computation of higher moments of the torus partit
ion function\, and will present an explicit computation of the spectral fo
rm factor of the dual ``U(1) gravity\,'' which can be written in terms of
a suitable analytic continuation of a degree-two Eisenstein series. I will
identify the terms in the sum over ``geometries'' that lead to a late-tim
e plateau in the spectral form factor\, and will demonstrate the absence o
f a linear ramp approaching the plateau from below. If time permits\, I wi
ll also discuss some ongoing work using Narain's family of CFTs as a testi
ng ground for the incorporation of the spectral theory of automorphic form
s into the two-dimensional conformal bootstrap.\n
LOCATION:https://researchseminars.org/talk/PUHET/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Belin (CERN)
DTSTART;VALUE=DATE-TIME:20210308T193000Z
DTEND;VALUE=DATE-TIME:20210308T203000Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/14
DESCRIPTION:Title: T
he OPE Randomness Hypothesis and Euclidean Wormholes\nby Alex Belin (C
ERN) as part of Princeton HET seminar\n\n\nAbstract\nRecent developments i
n holography indicate that the semi-classical Euclidean path-integral of E
instein gravity is much more powerful than previously anticipated. It is c
apable of reproducing a unitary Page curve for black hole evaporation\, an
d can even capture some features of the discrete nature of black hole micr
ostates. Wormhole geometries play a key role in this context. I will propo
se a mechanism to explain this in the CFT: the OPE Randomness Hypothesis.
This ansatz is a generalization of the Eigenstate Thermalization Hypothesi
s which applies to chaotic CFTs\, and treats OPE coefficients of heavy ope
rators as random variables with a given probability distribution. I will p
resent two applications of this framework: First\, it resolves a factoriza
tion puzzle in AdS_3/CFT_2 due to the genus-2 wormhole\, as raised by Maoz
and Maldacena. Second\, it provides an argument against global symmetries
in quantum gravity.\n
LOCATION:https://researchseminars.org/talk/PUHET/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Harlow (MIT)
DTSTART;VALUE=DATE-TIME:20210312T184500Z
DTEND;VALUE=DATE-TIME:20210312T194500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/15
DESCRIPTION:Title: A
lgebra of diffeomorphism-invariant operators in JT gravity from the Peierl
s bracket\nby Daniel Harlow (MIT) as part of Princeton HET seminar\n\n
\nAbstract\nIn this talk I will discuss recent work with Jie-qiang Wu\, wh
ere we use the covariant method of Peierls to compute the algebra of a wid
e variety of diffeomorphism-invariant operators in arbitrary states of Jac
kiw-Teitelboim gravity coupled to matter. We are then able to recast many
recent results as consequences of this algebra\, including the scrambling
time calculations of Shenker and Stanford\, the traversable wormhole of G
ao\, Jafferis\, and Wall\, and the SL(2\,R) generators of Lin\, Maldacena\
, and Zhao. We are also able to clarify some aspects of the "firewall typ
icality" argument of Marolf and Polchinski. The algebra is quite rich\, s
o we suspect there are more applications to be discovered.\n
LOCATION:https://researchseminars.org/talk/PUHET/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Grisha Tarnopolskiy (Harvard)
DTSTART;VALUE=DATE-TIME:20210326T174500Z
DTEND;VALUE=DATE-TIME:20210326T184500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/16
DESCRIPTION:Title: C
onformal operators in SYK-like models and their numerical effects\nby
Grisha Tarnopolskiy (Harvard) as part of Princeton HET seminar\n\n\nAbstra
ct\nQuantum mechanical models with random interactions have an infinite nu
mber of bilinear operators\,\nthe scaling dimensions of which can be compu
ted explicitly in the large N limit.\nThe lowest dimension operators play
an important role in thermodynamical\nproperties of these models and defin
e the behavior of various\ncorrelation functions in the infrared limit.\nI
n this talk I’ll show that some SYK-like models have operators\nwith unu
sual anomalous dimensions. I also demonstrate how\nthey can be observed in
numerical computations.\n
LOCATION:https://researchseminars.org/talk/PUHET/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alfredo Guevara (Harvard)
DTSTART;VALUE=DATE-TIME:20210409T174500Z
DTEND;VALUE=DATE-TIME:20210409T184500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/17
DESCRIPTION:Title: N
ew holomorphic features of celestial correlation functions\nby Alfredo
Guevara (Harvard) as part of Princeton HET seminar\n\n\nAbstract\nThe tal
k will be split in two parts. In part I we present a new infinite dimensio
nal symmetry algebra underlying scattering of gluons and gravitons. It ext
ends the leading and subleading generators by an infinite tower of soft mo
des located at negative integer weights. We derive the corresponding OPEs
and show how this is the minimal consistent extension of previous results.
Based on hep-th/2103.03961.\n\nIn part II we will analyze celestial holog
raphy in the context of 3D models such as large-N O(N) and Chern-Simons ma
tter theory. In these models a non-perturbative computation can be carried
out leading to novel features in the celestial 4-point function\, includi
ng crossing-symmetry relations and the conformal partial wave expansion\,
extending previous work of Lam and Shao. Work in progress with J. Kulp\, J
. Wu (Perimeter) and Garcia-Sepulveda (Chicago).\n
LOCATION:https://researchseminars.org/talk/PUHET/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jordan Cotler (Harvard)
DTSTART;VALUE=DATE-TIME:20210322T183000Z
DTEND;VALUE=DATE-TIME:20210322T193000Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/19
DESCRIPTION:Title: B
lack hole microstate statistics from Euclidean wormholes\nby Jordan Co
tler (Harvard) as part of Princeton HET seminar\n\n\nAbstract\nIn models o
f 2D dilaton gravity\, it has been shown that wormhole amplitudes encode b
lack hole microstate level statistics. These statistics quantitatively ag
ree with predictions of random matrix theory for chaotic quantum systems\;
this behavior is realized since the 2D theories in question are dual to m
atrix models. But what about black hole microstate statistics for Einstei
n gravity in 3D and higher spacetime dimensions\, and ultimately in string
theory? We will discuss progress in these directions. In AdS3\, we comp
ute a wormhole amplitude that encodes the energy level statistics of BTZ b
lack holes. In 4D and higher\, we discover analogous wormholes which appe
ar to encode the level statistics of small black holes just above threshol
d\; we find that the 1-loop approximations have a short-distance divergenc
e in pure Einstein gravity and so are sensitive to the details of UV compl
etion. Finally\, we study analogous Euclidean wormholes in supergravity o
n AdS5 x S5 and provide evidence that they encode the level statistics of
small black holes just above threshold. Remarkably\, these wormholes appe
ar stable in a certain parameter regime\, and dominate over the nucleation
of brane-anti-brane pairs in the computation of the spectral form factor
at late Lorentzian time.\n
LOCATION:https://researchseminars.org/talk/PUHET/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soumyadeep Chaudhuri (Hebrew University of Jerusalem)
DTSTART;VALUE=DATE-TIME:20210423T174500Z
DTEND;VALUE=DATE-TIME:20210423T184500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/20
DESCRIPTION:Title: T
hermal order in large N conformal gauge theories\nby Soumyadeep Chaudh
uri (Hebrew University of Jerusalem) as part of Princeton HET seminar\n\n\
nAbstract\nOur experience with many physical systems tells us that usually
when a symmetry is spontaneously broken at low temperatures\, it is resto
red upon increasing the temperature sufficiently. The abundance of such s
ystems raises the question of whether this is a universal feature of all q
uantum systems. In this talk\, I will present examples of (3+1)-dimensiona
l non-supersymmetric large N gauge theories which demonstrate violations o
f the above feature. I will argue that in the N tending to infinity limit\
, these theories have conformal manifolds which survive under all loop cor
rections to the beta functions of the couplings. I will show that under ce
rtain conditions\, a subset of points on such a conformal manifold demonst
rates the spontaneous breaking of a global symmetry at all nonzero tempera
tures. Furthermore\, I will demonstrate that this symmetry breaking is acc
ompanied by the Higgsing of a subset of gauge bosons leading the system to
be in a persistent Brout-Englert-Higgs phase\n
LOCATION:https://researchseminars.org/talk/PUHET/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anatoly Dymarsky (University of Kentucky)
DTSTART;VALUE=DATE-TIME:20210514T174500Z
DTEND;VALUE=DATE-TIME:20210514T184500Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/21
DESCRIPTION:by Anatoly Dymarsky (University of Kentucky) as part of Prince
ton HET seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/PUHET/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Philip Saad (IAS)
DTSTART;VALUE=DATE-TIME:20210419T183000Z
DTEND;VALUE=DATE-TIME:20210419T193000Z
DTSTAMP;VALUE=DATE-TIME:20240319T133324Z
UID:PUHET/22
DESCRIPTION:Title: W
ormholes without averaging\nby Philip Saad (IAS) as part of Princeton
HET seminar\n\n\nAbstract\nAfter averaging over fermion couplings\, SYK ha
s a collective field description that sometimes has “wormhole” solutio
ns. We study the fate of these wormholes when the couplings are fixed. Wor
king mainly in a simple model\, we find that the wormhole saddles persist\
, but that new saddles also appear elsewhere in the integration space –
“half-wormholes.” The wormhole contributions depend only weakly on the
specific choice of couplings\, while the half-wormhole contributions are
strongly sensitive. The half-wormholes are crucial for factorization of de
coupled systems with fixed couplings\, but they vanish after averaging\, l
eaving the non-factorizing wormhole behind.\n
LOCATION:https://researchseminars.org/talk/PUHET/22/
END:VEVENT
END:VCALENDAR