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BEGIN:VEVENT
SUMMARY:Nathan Seiberg (IAS)
DTSTART:20200427T210000Z
DTEND:20200427T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/1
DESCRIPTION:Title: Continuum Quantum Field Theories for Fractons\nby Nathan Seiberg (
IAS) as part of SITP seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Po-shen Hsin (Caltech)
DTSTART:20200511T210000Z
DTEND:20200511T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/2
DESCRIPTION:Title: Berry phase in quantum field theory\nby Po-shen Hsin (Caltech) as
part of SITP seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hong Liu (MIT)
DTSTART:20200504T210000Z
DTEND:20200504T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/3
DESCRIPTION:Title: Void formation in operator growth\, quantum chaos and black hole evapo
ration\nby Hong Liu (MIT) as part of SITP seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tom Hartman (Cornell)
DTSTART:20200518T210000Z
DTEND:20200518T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/4
DESCRIPTION:Title: Sphere packing\, 3d gravity\, and the bootstrap\nby Tom Hartman (C
ornell) as part of SITP seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Riccardo Rattazzi (EPFL)
DTSTART:20200601T210000Z
DTEND:20200601T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/5
DESCRIPTION:Title: Multilegs\, Superfluids and Semiclassics\nby Riccardo Rattazzi (EP
FL) as part of SITP seminar\n\n\nAbstract\nEven in weakly coupled QFTs\, p
erturbation theory breaks down when one considers amplitudes with a large
number $n$ of legs. The series cleverly organizes as a double expansion
in $g^2$ and $g^2n$. I show how the series in $g^2n$ can be fully captu
red by a semiclassical expansion around a non-trivial solution. Focussing
on $U(1)$ symmetric $|\\phi|^4$ theory in $4$ and $4-\\epsilon$ dimension
I derive explict and consistent all order results for the anomalous dimens
ion of the complex operator $\\phi^n$. When restricting to the Wilson-Fis
her fixed point and working on the cylinder\, the dominant trajectory is s
een to correspond to a superfluid phase for the conserved U(1). This creat
es a remarkable correspondence between\, on one side\, the spectrum of op
erators and fusion coeffcients and and on the other the spectrum of hydrod
ynamics modes and their interactions. The results also nicely match Monte
Carlo simulations in 3D\, compatibly with the stunt of taking $\\epsilon=1
$.\n\n\n\nPlease subscribe through this link for notifications:\n\nhttps:/
/docs.google.com/forms/d/e/1FAIpQLSftoD33H-yK9G3ePko8LfNpsLE9gLg92TJBXYzOj
a8LN3RZ4Q/viewform?vc=0&c=0&w=1&fbclid=IwAR1NIjCxv6kezbJdkms0x3oDmzMhxbhOR
GkCx-OU3vsc6C9xlzGTfKBX7GM\n
LOCATION:https://researchseminars.org/talk/SITPseminar/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kristan Jensen (SFSU)
DTSTART:20200608T210000Z
DTEND:20200608T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/6
DESCRIPTION:Title: Wormholes in AdS3 gravity and random matrix theory\nby Kristan Jen
sen (SFSU) as part of SITP seminar\n\nAbstract: TBA\n\nPlease subscribe th
rough this link for notifications:\n\nhttps://docs.google.com/forms/d/e/1F
AIpQLSftoD33H-yK9G3ePko8LfNpsLE9gLg92TJBXYzOja8LN3RZ4Q/viewform?vc=0&c=0&w
=1&fbclid=IwAR1NIjCxv6kezbJdkms0x3oDmzMhxbhORGkCx-OU3vsc6C9xlzGTfKBX7GM\n
LOCATION:https://researchseminars.org/talk/SITPseminar/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finn Larsen (UMich)
DTSTART:20200615T210000Z
DTEND:20200615T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/7
DESCRIPTION:Title: Microscopic Entropy of AdS Black Holes\nby Finn Larsen (UMich) as
part of SITP seminar\n\n\nAbstract\nTITLE\nMicroscopic Entropy of AdS Blac
k Holes\n\nABSTRACT\nThe interpretation of black hole entropy in terms of
a quantum field theory is (nearly) universally accepted and detailed prope
rties of the duality underpin numerous active research directions. However
\, a precise numerical agreement between microscopic and macroscopic entro
pies for black holes in AdS faced challenges that were only recently addre
ssed. We discuss new results and compare them with familiar ones from AdS(
3).\n
LOCATION:https://researchseminars.org/talk/SITPseminar/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sean Hartnoll (Stanford)
DTSTART:20200622T210000Z
DTEND:20200622T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/8
DESCRIPTION:Title: Classical aspects of the black hole interior\nby Sean Hartnoll (St
anford) as part of SITP seminar\n\n\nAbstract\nGeneric classical black hol
e interiors will be highly inhomogeneous and complicated. However\, most h
olographic studies of the interior start from simple geometries such as Ad
S-Schwarzschild or AdS-Reissner-Nordstrom. These have rather specific sing
ularity structures and AdS-RN has an inner Cauchy horizon at which classic
al predictability breaks down. As we seek to understand the quantum gravit
ational fate of black hole interiors\, and to understand the holographic d
escription of infalling observers\, it seems like a good idea to make sure
that any lessons we learn are not tied to overly simple non-generic class
ical starting points. Within a holographic framework\, a simple and natura
l step towards genericity can be made by deforming the boundary theory awa
y from conformality. I will describe the effects that such deformations ha
ve on the interior of neutral and charged black holes.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shinsei Ryu (U Chicago)
DTSTART:20200713T210000Z
DTEND:20200713T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/9
DESCRIPTION:Title: Entanglement negativity and reflected entropy after quantum quench in
2d CFTs\nby Shinsei Ryu (U Chicago) as part of SITP seminar\n\n\nAbstr
act\nWe will discuss non-equilibrium dynamics of 2d conformal field theori
es probed by\nthe time-dependence of entanglement negativity and reflected
entropy after quantum quench of\nvarious kinds. We will contrast two para
digmatic pictures -- quasi-particle and membrane pictures --\nthat can des
cribe the time-evolutions of these quantities depending on whether the und
erlying\ndynamics is non-chaotic or chaotic. While the propagation of quan
tum entanglement in rational\nCFTs is described by the quasi-particle pict
ures\, that in holographic CFTs is described by\nthe membrane picture.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hirosi Ooguri (Caltech)
DTSTART:20200727T210000Z
DTEND:20200727T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/10
DESCRIPTION:Title: Stringy Tidal Effects Near Black Hole Photon Spheres\nby Hirosi O
oguri (Caltech) as part of SITP seminar\n\n\nAbstract\nI will report on my
work in progress with Matthew Dodelson. Correlation functions of CFT with
a weakly coupled holographic dual have interesting singularities due to n
ull geodesics in the bulk dual. In my paper with Dodelson last year\, we s
howed that certain Landau singularities in the bulk at zero temperature ar
e resolved in string theory by the Gross-Mende expansion of the worldsheet
. At finite temperature\, we find that a black hole photon sphere causes
null singularities that are contrary to our expectations for CFT. We show
how these singularities are resolved in string theory by tidal effects on
the worldsheet\, which are enhanced near the null geodesics.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kevin Costello (Perimeter Institute)
DTSTART:20200803T210000Z
DTEND:20200803T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/11
DESCRIPTION:Title: Integrable field theories from four-dimensional gauge theory\nby
Kevin Costello (Perimeter Institute) as part of SITP seminar\n\n\nAbstract
\nI will discuss aspects of my work with Yamazaki\, Witten\, Stefanski\, a
nd Gaiotto which gives a unified construction of two-dimensional integrabl
e field theories and string theories from a certain four-dimensional gauge
theory.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Juan Maldacena (IAS)
DTSTART:20200810T210000Z
DTEND:20200810T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/12
DESCRIPTION:Title: Bra-ket wormholes in gravitationally prepared states\nby Juan Mal
dacena (IAS) as part of SITP seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eva Silverstein (Stanford)
DTSTART:20200831T210000Z
DTEND:20200831T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/13
DESCRIPTION:Title: The positive potential of negative curvature\nby Eva Silverstein
(Stanford) as part of SITP seminar\n\n\nAbstract\nThis talk will describe
a new mechanism under development for accelerated expansion in the generic
case of negative-curvature compactifications of string/M theory (based on
work in progress with B. De Luca and G. Torroba). Hyperbolic manifolds ar
e well-studied mathematically\, with an important rigidity property at fix
ed volume above dimension 2. They exhibit precise generalizations of strin
g dualities and connect to other areas of the landscape. M theory on a fid
ucial hyperbolic manifold with asymmetric cusp cross section\, along with
its automatically generated Casimir energy and a single source (7-form flu
x) contains an immediate 3-term structure for volume stabilization. After
bounding residual tadpoles from spatial variations of the Casimir energy\,
we study the detailed internal equations of motion and off-shell effectiv
e potential as formulated by M. Douglas. We derive a Maldacena-Nunez style
no-go theorem for Anti-de Sitter extrema for a range of parameters\, obse
rve that standard integrated inequalities are all consistent with de Sitte
r solutions\, and discuss smooth internal field configurations with small
slow roll parameters. Both human and artificial neural networks -- includi
ng novel optimization methods via Born-Infeld dynamics and loss functions
built from slow roll parameters -- contribute to the analysis\n
LOCATION:https://researchseminars.org/talk/SITPseminar/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexey Milekhin (UCSB)
DTSTART:20200928T210000Z
DTEND:20200928T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/14
DESCRIPTION:Title: quantum error correction and large N\nby Alexey Milekhin (UCSB) a
s part of SITP seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lorenz Eberhardt (IAS)
DTSTART:20201019T210000Z
DTEND:20201019T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/15
DESCRIPTION:Title: Partition functions of the tensionless string\nby Lorenz Eberhard
t (IAS) as part of SITP seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Netta Engelhardt (MIT)
DTSTART:20201012T210000Z
DTEND:20201012T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/16
DESCRIPTION:Title: Free Energy from Replica Wormholes\nby Netta Engelhardt (MIT) as
part of SITP seminar\n\n\nAbstract\nRecent developments on the black hole
information paradox have shown that Euclidean wormholes — so called “r
eplica wormholes’’ can dominate the von Neumann entropy as computed by
a gravitational path integral\, and that inclusion of these wormholes res
ults in a unitary Page curve. This development raises some puzzles from th
e perspective of factorization\, and has raised questions regarding what t
he gravitational path integral is computing. In this talk\, I will focus o
n understanding the relationship between the gravitational path integral a
nd the partition function via the gravitational free energy (more generall
y the generating functional). A proper computation of the free energy requ
ires a replica trick distinct from the usual one used to compute the entro
py. I will show that in JT gravity there is a regime where the free energy
computed without replica wormholes is pathological. Interestingly\, the i
nclusion of replica wormholes is not quite sufficient to resolve the patho
logy: an alternative analytic continuation is required. I will discuss the
implications of this for various interpretations of the gravitational pat
h integral (e.g. as computing an ensemble average) and also mention some p
arallels with spin glasses.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leonardo Senatore (Stanford University)
DTSTART:20201005T210000Z
DTEND:20201005T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/17
DESCRIPTION:Title: A de-Sitter no-hair theorem for spacetimes with isometry group formin
g two-dimensional orbits\nby Leonardo Senatore (Stanford University) a
s part of SITP seminar\n\n\nAbstract\nI present how some numerical and ana
lytical general relativity techniques allow us to show how inflation\, or
a local region of de Sitter space\, gets started notwithstanding very inho
mogeneous initial conditions and the potential formation of localized sing
ularities.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Petr Horava (UC Berkeley)
DTSTART:20201026T210000Z
DTEND:20201026T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/18
DESCRIPTION:Title: Large N Expansion and String Theory Out of Equilibrium\nby Petr H
orava (UC Berkeley) as part of SITP seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sung-Sik Lee (McMaster University)
DTSTART:20201116T220000Z
DTEND:20201116T230000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/19
DESCRIPTION:Title: A model of quantum gravity with emergent spacetime\nby Sung-Sik L
ee (McMaster University) as part of SITP seminar\n\n\nAbstract\nWe present
a model of quantum gravity in which dimension\, topology and geometry of
spacetime are collective dynamical variables that describe the pattern of
entanglement of underlying quantum matter. As spacetime with arbitrary dim
ensions can emerge\, the spacetime gauge symmetry is generalized to a grou
p that includes diffeomorphisms in general dimensions. The gauge symmetry
obeys a first-class constraint operator algebra\, and is reduced to a gene
ralized hypersurface deformation algebra in states that exhibit classical
spacetimes. In the semi-classical limit\, we find a saddle-point solution
that describes a series of (3+1)-dimensional de Sitter-like spacetimes wit
h the Lorentzian signature bridged by Euclidean spaces in between. Fluctua
tions of the collective variables are described by bi-local fields that pr
opagate in the spacetime set up by the saddle-point configuration of the c
ollective variables.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alejandra Castro (University of Amsterdam)
DTSTART:20201130T220000Z
DTEND:20201130T230000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/20
DESCRIPTION:Title: The Spectrum of Near-Extremal Rotating Black Holes\nby Alejandra
Castro (University of Amsterdam) as part of SITP seminar\n\n\nAbstract\nIn
this talk\, I will revisit the spectrum of gravitational perturbations of
extremal rotating black holes\, with emphasis on the Kerr solution. The g
oal is to identify and describe the modes that encode the dynamics of Jack
iw-Teitelboim gravity\, aka the JT sector\, which is expected to account f
or the deviations away from extremality. For rotating solutions this secto
r contains new features relative to their charged cousins that I will disc
uss. If time allows\, I will also present the analysis for a 5D rotating b
lack hole\, where the analysis can be done at a non-linear level with anal
ytic control.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vijay Balasubramanian (University of Pennsylvania)
DTSTART:20201102T220000Z
DTEND:20201102T230000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/21
DESCRIPTION:Title: Knitting wormholes by entanglement in supergravity\nby Vijay Bala
subramanian (University of Pennsylvania) as part of SITP seminar\n\n\nAbst
ract\nWe construct a single-boundary wormhole geometry in type IIB supergr
avity by perturbing two stacks of N extremal D3-branes in the decoupling
limit. The solution interpolates from a two-sided planar AdS-Schwarzschild
geometry in the interior\, through a harmonic two-center solution in the
intermediate region\, to an asymptotic AdS space. The construction involve
s a CPT twist in the gluing of the wormhole to the exterior throats that g
ives a global monodromy to some coordinates\, while preserving orientabili
ty. The geometry has a dual interpretation in $\\mathcal{N}=4\,\\\;SU(2N)$
Super Yang-Mills theory in terms of a Higgsed $SU(2N) \\to S(U(N) \\times
U(N))$ theory in which $\\mathcal{O}(N^2)$ degrees of freedom in each $SU
(N)$ sector are entangled in an approximate thermofield double state at a
temperature much colder than the Higgs scale. We argue that the solution c
an be made long-lived by appropriate choice of parameters\, and comment on
mechanisms for generating traversability. We also describe a constructio
n of a double wormhole between two universes.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emil Martinec (UChicago)
DTSTART:20210125T220000Z
DTEND:20210126T000000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/22
DESCRIPTION:Title: In Pursuit of the Hirsute: Finding Fuzz Around Black Holes\nby Em
il Martinec (UChicago) as part of SITP seminar\n\n\nAbstract\nAn understan
ding of black hole microstructure – where and how they store and release
information – remains elusive. One place to look is near extremality w
here these structures might reveal themselves\, and (super)symmetry might
help tame strong dynamics. This talk provides an overview of the fuzzball
program\, which broadly speaking is an ongoing investigation of the sorts
of ingredients from string theory – both geometrical and stringy – th
at are involved in extremal and near-extremal black hole microstructure.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Slava Rychkov (IHES)
DTSTART:20210201T190000Z
DTEND:20210201T210000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/23
DESCRIPTION:Title: Replicas and RG: case study of Random Field Ising Model\nby Slava
Rychkov (IHES) as part of SITP seminar\n\n\nAbstract\nRandom Field Ising
Model is the classical Ising model with added quenched disorder (magnetic
impurities). This model has a second-order phase transition. For dimension
D close to the upper critical dimension 6\, the phase transition is descr
ibed by a Parisi-Sourlas non-unitary supersymmetric CFT\, and has the same
critical exponents as the non-disordered Ising model in D-2 dimensions. F
or lower D supersymmetry and dimensional reduction are lost\, but why? Elu
cidating this from the RG point of view was an open problem for many years
. I will describe recent progress achieved in arXiv:1912.01617\, arXiv:200
9.10087 (joint work with Apratim Kaviraj and Emilio Trevisani).\n
LOCATION:https://researchseminars.org/talk/SITPseminar/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jorge Kurchan (ENS Paris)
DTSTART:20210208T220000Z
DTEND:20210209T000000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/24
DESCRIPTION:Title: An unexpected bridge between Black Holes and glasses\nby Jorge Ku
rchan (ENS Paris) as part of SITP seminar\n\n\nAbstract\nThe Sachdev-Ye-Ki
taev model has been recognized in the past few years as a simple model hav
ing the symptoms of Black Holes and holography. Central to this correspond
ence is an emergent time-reparametrization invariance that appears in the
low-temperature\, slow dynamic limit. Glasses were long ago recognized as
having the same symmetry\, and for exactly the same formal reasons: the sl
owness of the dynamics makes kinetic terms negligible. More recently\, it
has been realized that this symmetry is not merely an accident: it is a n
ecessary condition for both the Parisi (replica) construction and the corr
esponding dynamic picture to be consistent. Indeed\, as I will show\, two
systems brought into infinitesimal contact have to be able to operate a l
arge rearrangement of their timescales in order to match into a joint solu
tion of the same general form. It is also amusing to see that two glasses
brought into contact develop a first-order transition in the temperature-i
nteraction plane\, as do two SYK models.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joao Penedones (EPFL Lausanne)
DTSTART:20210308T190000Z
DTEND:20210308T210000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/25
DESCRIPTION:Title: Bootstrapping Effective Field Theories: pions and supergravitons\
nby Joao Penedones (EPFL Lausanne) as part of SITP seminar\n\n\nAbstract\n
I will review the (numerical) S-matrix Bootstrap approach to scattering am
plitudes. In particular\, I will explain how this approach can be used to
bound the space of Wilson coefficients in Effective Field Theories (EFT).
I will discuss two notable examples: the chiral lagrangian and supergravit
y. Remarkably\, strongly coupled string theory seems to saturate the bound
s imposed by Lorentz invariance\, unitarity and causality.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matias Zaldarriaga (IAS Princeton)
DTSTART:20210315T210000Z
DTEND:20210315T230000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/26
DESCRIPTION:by Matias Zaldarriaga (IAS Princeton) as part of SITP seminar\
n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sameer Murthy (King's College London)
DTSTART:20210412T180000Z
DTEND:20210412T200000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/27
DESCRIPTION:Title: Black hole microstates from matrices\, and phases of super Yang-Mills
theory\nby Sameer Murthy (King's College London) as part of SITP semi
nar\n\n\nAbstract\nOne question arising from the holographic principle is:
what are the microstates of black holes in the dual large-N field theory?
I will discuss recent progress on answering this question in canonical ex
amples of the AdS/CFT correspondence (e.g. 4d $N=4$ SYM/AdS$_5$ string the
ory). The field theory model is an integral over $N \\times N$ unitary mat
rices with a certain action which counts supersymmetric states in four-dim
ensional super Yang-Mills theory. I will present analytical and numerical
analyses of the matrix model which show that the asymptotic growth of stat
es of the matrix model with large charges agrees precisely with that of th
e dual black hole microstates. In particular\, I will introduce a deformat
ion of the matrix model which allows us to find large-N saddle-points and
the resultant phase structure. I will show that there is an infinite famil
y of large-N saddle points\, one of which is identified with the black hol
e. The deformation is closely related to the Bloch-Wigner elliptic dilogar
ithm\, a function introduced by number theorists.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yu-tin Huang (National Taiwan University)
DTSTART:20210503T210000Z
DTEND:20210503T230000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/29
DESCRIPTION:by Yu-tin Huang (National Taiwan University) as part of SITP s
eminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Junwu Huang (Perimeter)
DTSTART:20210510T210000Z
DTEND:20210510T230000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/30
DESCRIPTION:by Junwu Huang (Perimeter) as part of SITP seminar\n\nAbstract
: TBA\n
LOCATION:https://researchseminars.org/talk/SITPseminar/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Veronika Hubeny (UC Davis)
DTSTART:20210517T210000Z
DTEND:20210517T230000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/31
DESCRIPTION:Title: Holographic Entropy Cone from Marginal Independence\nby Veronika
Hubeny (UC Davis) as part of SITP seminar\n\n\nAbstract\nThis talk will ex
plain recent puzzling revelations in the ongoing efforts to obtain a usefu
l characterization of entanglement structure of geometric states in a holo
graphic CFT\, via the so-called holographic entropy cone (HEC). The relati
ons between subsystem entanglement entropies which delimit this cone are k
nown explicitly for only a rather coarse subdivision of the system (specif
ied by N spatial regions\, for up to N = 5). We argue that\, subject to a
certain graph theoretic conjecture\, the task of finding the HEC for arbit
rary N can be recast in terms of a much simpler combinatorial one which ef
fectively reduces to the connectivity of entanglement wedges. More specifi
cally\, the N-party HEC can be reconstructed by solving the holographic ma
rginal independence problem (HMIP) for a finer subdivision N′ ≥ N\, wh
ich technically amounts to identifying which extreme rays of this subaddit
ivity cone are realizable holographically. Curiously\, despite the fact th
at subadditivity is a universal property which states that total correlati
on cannot be negative\, the non-trivial facets of the HEC constructed ther
efrom nevertheless cannot be recast as correlation measures.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nina Holden (ETH Zürich)
DTSTART:20210524T170000Z
DTEND:20210524T183000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/32
DESCRIPTION:Title: Liouville quantum gravity in probability theory\nby Nina Holden (
ETH Zürich) as part of SITP seminar\n\n\nAbstract\nIn probability theory\
, Liouville quantum gravity (LQG) is a model for a random surface. There a
re two main directions of study: random conformal geometry and Liouville c
onformal field theory. We will give an overview of some recent development
s on LQG in probability theory.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renato Renner (ETH Zurich)
DTSTART:20210301T220000Z
DTEND:20210301T230000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/33
DESCRIPTION:Title: A thought experiment to test the range of validity of quantum theory<
/a>\nby Renato Renner (ETH Zurich) as part of SITP seminar\n\n\nAbstract\n
Quantum theory is one of our most accurate theories ever when it comes to
the description of small systems. It is therefore often assumed that the t
heory can equally well be applied to large objects\, sometimes even astron
omical ones like black holes. In this talk I will present a thought experi
ment that indicates that the range of validity of (current) quantum theory
may be limited. It shows that contradictions can arise when quantum theor
y is used to describe a system that is complex enough so that it could its
elf contain users of quantum theory. (The talk is based on work with Danie
la Frauchiger and Nuriya Nurgalieva.)\n
LOCATION:https://researchseminars.org/talk/SITPseminar/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jorge Santos (University of Cambridge)
DTSTART:20210426T170000Z
DTEND:20210426T183000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/34
DESCRIPTION:Title: AdS Euclidean Wormholes\nby Jorge Santos (University of Cambridge
) as part of SITP seminar\n\n\nAbstract\nWe explore the construction and s
tability of asymptotically anti-de Sitter Euclidean wormholes in a variety
of models. In simple ad hoc low-energy models\, it is not hard to constru
ct two-boundary Euclidean wormholes that dominate over disconnected soluti
ons and which are stable (lacking negative modes) in the usual sense of Eu
clidean quantum gravity. Indeed\, the structure of such solutions turns ou
t to strongly resemble that of the Hawking-Page phase transition for AdS-S
chwarzschild black holes\, in that for boundary sources above some thresho
ld we find both a 'large' and a 'small' branch of wormhole solutions with
the latter being stable and dominating over the disconnected solution for
large enough sources. We are also able to construct two-boundary Euclidean
wormholes in a variety of string compactifications that dominate over the
disconnected solutions we find and that are stable with respect to field-
theoretic perturbations. However\, as in classic examples investigated by
Maldacena and Maoz\, the wormholes in these UV-complete settings always su
ffer from brane-nucleation instabilities (even when sources that one might
hope would stabilize such instabilities are tuned to large values). This
indicates the existence of additional disconnected solutions with lower ac
tion. We discuss the significance of such results for the factorization pr
oblem of AdS/CFT.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Micha Berkooz (Weizmann)
DTSTART:20210603T173000Z
DTEND:20210603T190000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/35
DESCRIPTION:Title: Multi-trace correlators in the SYK model and Non-geometric wormholes<
/a>\nby Micha Berkooz (Weizmann) as part of SITP seminar\n\n\nAbstract\nWe
consider the global fluctuations in the density of states of the SYK mode
l. The connected contributions to the moments are much larger than the sta
ndard RMT correlations. We provide a diagrammatic description of the leadi
ng behavior of these connected moments in terms of 1PI cactus graphs\, and
derive a vector model of the couplings which reproduces these results. We
generalize these results to the first subleading corrections\, and to flu
ctuations of correlation functions. In either case\, the new set of correl
ations are not associated with (and are much larger than) the ones given b
y topological wormholes. The connected contributions that we discuss are t
he beginning of an infinite series of terms\, associated with more and mor
e information about the ensemble of couplings\, which hints towards the du
al of a single realization. In particular\, we suggest that incorporating
them in the gravity description requires the introduction of new\, lighter
and lighter\, fields in the bulk with fluctuating boundary couplings.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ana-Maria Raclariu (Perimeter Institute)
DTSTART:20211004T210000Z
DTEND:20211004T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/36
DESCRIPTION:Title: Progress in Celestial Holography\nby Ana-Maria Raclariu (Perimete
r Institute) as part of SITP seminar\n\n\nAbstract\nCelestial amplitudes d
escribe scattering in a basis of boost eigenstates. In this basis\, 4-poin
t massless scattering observables are functions of two variables: the sum
over the boost weights $\\beta$ which is dual to the center of mass energy
\, and a cross ratio $z$ related to the bulk scattering angle. In this tal
k I will describe two aspects of the physics captured by the $\\beta$ and
$z$ dependence. I will first show that the UV behavior of 4-point scatteri
ng is encoded in the analytic structure of celestial amplitudes in the com
plex $\\beta$ plane. The residues of the poles at negative even integer $\
\beta$ are related to coefficients of higher-dimension operators in the lo
w-energy effective action\, hence subject to positivity constraints\, whil
e poles at positive even integer $\\beta$ arise from UV asymptotics. I wil
l then show that the $z$ dependence contains information about the celesti
al spectrum and three-point couplings. For massless scalar 4-point scatter
ing mediated by massive exchange\, the conformal blocks include massive sc
alar states with positive integer conformal weights\, as well as intermedi
ate exchanges of spinning light-ray states.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ofer Aharony (Weizmann Institute of Science)
DTSTART:20211011T180000Z
DTEND:20211011T200000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/37
DESCRIPTION:Title: Towards an explicit theory of quantum gravity\nby Ofer Aharony (W
eizmann Institute of Science) as part of SITP seminar\n\n\nAbstract\nIn th
e first half of this colloquium I will review the problem of quantum gravi
ty\, and how it is solved for quantum gravity in anti-de Sitter space by t
he AdS/CFT correspondence. I will give two examples of this correspondence
illustrating that unlike in most other dualities\, quantum effects can be
small on both sides of the duality at the same time. In the second half I
will present for one of these examples (the O(N) vector model) an explici
t construction of a quantum theory of gravity (based on 2011.06328 in coll
aboration with Shai Chester and Erez Urbach).\n
LOCATION:https://researchseminars.org/talk/SITPseminar/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Liam McAllister (Cornell University)
DTSTART:20211018T210000Z
DTEND:20211018T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/38
DESCRIPTION:Title: Small Cosmological Constants in String Theory\nby Liam McAllister
(Cornell University) as part of SITP seminar\n\n\nAbstract\nWe construct
vacua of string theory in which all moduli are stabilized and the magnitud
e of the cosmological constant is exponentially small. The vacua are supe
rsymmetric AdS_4 solutions in flux compactifications of type IIB string th
eory on orientifolds of Calabi-Yau hypersurfaces. I will explain the adva
nces in computing topological data in Calabi-Yau compactifications that le
d to these solutions\, then discuss implications for the cosmological cons
tant problem. The vacuum energy is small because we ensure the exact canc
ellation of all perturbative contributions\, through an explicit choice of
integer parameters determined by the topology and quantized fluxes. The
nonperturbative contributions that remain are exponential in these integer
s. Finding cosmological constants of small magnitude in this landscape is
exponentially easier than in Bousso-Polchinski landscapes. Extending thi
s approach to positive cosmological constants\, however\, is a difficult o
pen problem.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wendy Freedman (University of Chicago)
DTSTART:20211025T210000Z
DTEND:20211025T220000Z
DTSTAMP:20260422T212935Z
UID:SITPseminar/39
DESCRIPTION:Title: The Hubble Tension: Is There Evidence for New Physics?\nby Wendy
Freedman (University of Chicago) as part of SITP seminar\n\n\nAbstract\nAn
important and unresolved question in cosmology today is whether there is
new physics that is missing from our current standard Lambda Cold Dark Mat
ter (LCDM) model. Recent measurements of the Hubble constant\, Ho -- based
on Cepheids and Type Ia supernovae (SNe) -- are discrepant at the 4-5-sig
ma level with values of Ho inferred from measurements of fluctuations in t
he cosmic microwave background (CMB). The latter assumes LCDM\, and the fo
rmer assumes that systematics have been fully accounted for. If real\, the
current discrepancy could be signaling a new physical property of the uni
verse. I will present new results based on an independent calibration of S
Ne Ho based on measurements of the Tip of the Red Giant Branch (TRGB). The
TRGB marks the luminosity at which the core helium flash in low-mass star
s occurs\, and provides an excellent standard candle. Moreover\, the TRGB
method is less susceptible to extinction by dust\, to metallicity effects\
, and to crowding/blending effects than Cepheid variable stars. I will
address the current uncertainties in both the TRGB and Cepheid distance sc
ales\, as well as discuss the current tension in Ho and whether there is n
eed for additional physics beyond the standard LCDM model.\n
LOCATION:https://researchseminars.org/talk/SITPseminar/39/
END:VEVENT
END:VCALENDAR