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BEGIN:VEVENT
SUMMARY:Finn Larsen: TBA
DTSTART;VALUE=DATE-TIME:20170515T093000Z
DTEND;VALUE=DATE-TIME:20170515T103000Z
DTSTAMP;VALUE=DATE-TIME:20211202T184500Z
UID:indico-contribution-7197@indico.nbi.ku.dk
DESCRIPTION:https://indico.nbi.ku.dk/event/979/contributions/7197/
LOCATION:Auditorium A (Niels Bohr Institute)
URL:https://indico.nbi.ku.dk/event/979/contributions/7197/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Larus Thorlacius: Probing emergent geometry in free vector and mat
rix models
DTSTART;VALUE=DATE-TIME:20170516T093000Z
DTEND;VALUE=DATE-TIME:20170516T103000Z
DTSTAMP;VALUE=DATE-TIME:20211202T184500Z
UID:indico-contribution-7199@indico.nbi.ku.dk
DESCRIPTION:Boundary correlation functions provide insight into the emerge
nce of an effective geometry in higher spin gravity duals of O(N) or U(N)
symmetric field theories. On a compact manifold\, the singlet constraint l
eads to nontrivial dynamics at finite temperature and large N phase transi
tions even at vanishing ’t Hooft coupling. At low temperature\, the lead
ing behavior of boundary two-point functions is consistent with propagatio
n through a bulk thermal AdS space.\nAbove the phase transition\, the two-
point function shows significant departure from thermal AdS space and the
emergence of localized black hole like objects in the bulk.\nhttps://indic
o.nbi.ku.dk/event/979/contributions/7199/
LOCATION:Auditorium A (Niels Bohr Institute)
URL:https://indico.nbi.ku.dk/event/979/contributions/7199/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Guido Festuccia: Supersymmetric Indices and RG Flows
DTSTART;VALUE=DATE-TIME:20170515T140000Z
DTEND;VALUE=DATE-TIME:20170515T150000Z
DTSTAMP;VALUE=DATE-TIME:20211202T184500Z
UID:indico-contribution-7200@indico.nbi.ku.dk
DESCRIPTION:Indices are a powerful tool to analyse the dynamics of supersy
mmetric field theories\; for instance\, supersymmetric indices for non-con
formal susy field theories can be used to explore their RG flows.\nAn inte
resting class of indices can be defined by placing (non conformal) supersy
mmetric field theories on S^dxS^1 preserving susy. For N=1 this index is
related to the N=1 superconformal index in a simple way. \nFor N=2 superco
nformal theories one can also define an index but its extension to non con
formal N=2 field theories is not possible. Nevertheless\, I will show that
a particular limit of the N=2 superconformal index\, the "Schur limit"\,
can be defined for non conformal field theories. I will then explore the p
roperties and uses of this index.\nhttps://indico.nbi.ku.dk/event/979/cont
ributions/7200/
LOCATION:Auditorium A (Niels Bohr Institute)
URL:https://indico.nbi.ku.dk/event/979/contributions/7200/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Poland: Bootstrapping the Stress-Energy Tensor
DTSTART;VALUE=DATE-TIME:20170516T140000Z
DTEND;VALUE=DATE-TIME:20170516T150000Z
DTSTAMP;VALUE=DATE-TIME:20211202T184500Z
UID:indico-contribution-7201@indico.nbi.ku.dk
DESCRIPTION:I will discuss recent progress at extending the conformal boot
strap to 4-point functions containing the stress-energy tensor. This progr
ess includes deriving analytical sum rules for the coefficients in stress-
tensor 2-point and 3-point functions\, and producing numerical bounds on t
hese coefficients for various gaps in the spectrum. All of these constrain
ts can be interpreted holographically as highly nontrivial restrictions on
the properties of bulk gravity in AdS.\nhttps://indico.nbi.ku.dk/event/97
9/contributions/7201/
LOCATION:Auditorium A (Niels Bohr Institute)
URL:https://indico.nbi.ku.dk/event/979/contributions/7201/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phil Szepietowski: Alternative boundary conditions in AdS\, one-lo
op determinants and WCFTs
DTSTART;VALUE=DATE-TIME:20170515T080000Z
DTEND;VALUE=DATE-TIME:20170515T090000Z
DTSTAMP;VALUE=DATE-TIME:20211202T184500Z
UID:indico-contribution-7204@indico.nbi.ku.dk
DESCRIPTION:I will discuss the computation of the graviton one-loop determ
inant in the BTZ black hole background with certain chiral boundary condit
ions at the AdS boundary. These boundary conditions were proposed by Compe
re\, Song and Strominger and were shown to modify the asymptotic symmetry
algebra from a sum of left and right Virasoro algebras to a single right-m
oving Virasoro U(1) Kac-Moody. This implies that the holographic dual desc
ription possesses such global symmetry and so should be described by a war
ped conformal field theory (WCFT) instead of a standard CFT. In the talk I
will overview the new boundary conditions and the concept of a WCFT\, out
line the computational method of obtaining the one-loop determinant from t
he "quasinormal" mode spectrum (highlighting elements which are unique to
the new boundary conditions) and discuss the implications of the results f
or the boundary field theory.\nhttps://indico.nbi.ku.dk/event/979/contribu
tions/7204/
LOCATION:Auditorium A (Niels Bohr Institute)
URL:https://indico.nbi.ku.dk/event/979/contributions/7204/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alejandra Castro: Siegel Modular Forms and Black Hole Entropy
DTSTART;VALUE=DATE-TIME:20170515T120000Z
DTEND;VALUE=DATE-TIME:20170515T130000Z
DTSTAMP;VALUE=DATE-TIME:20211202T184500Z
UID:indico-contribution-7206@indico.nbi.ku.dk
DESCRIPTION:In this talk I will present statistical systems\, or more prec
isely counting formulas\, that have the potential to account for the entro
py of an extremal black hole. The goal is to capture and translate the ro
bustness in gravity into data of the quantum system. One the microscopic s
ide\, which is the main emphasis of this talk\, I want to illustrate not o
nly how one can design generating functions with the desired features\, bu
t also present a procedure to extract the entropy systematically.\nhttps:/
/indico.nbi.ku.dk/event/979/contributions/7206/
LOCATION:Auditorium A (Niels Bohr Institute)
URL:https://indico.nbi.ku.dk/event/979/contributions/7206/
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BEGIN:VEVENT
SUMMARY:Gim Seng Ng: Witten Diagrams for Torus Conformal Blocks
DTSTART;VALUE=DATE-TIME:20170516T120000Z
DTEND;VALUE=DATE-TIME:20170516T130000Z
DTSTAMP;VALUE=DATE-TIME:20211202T184500Z
UID:indico-contribution-7208@indico.nbi.ku.dk
DESCRIPTION:We give a holographic description of global conformal blocks i
n two dimensional conformal field theory on the sphere and on the torus. W
e show that the conformal blocks on the torus can be written as Witten dia
grams in the thermal AdS. This is accomplished by deriving a general confo
rmal Casimir equation for global conformal blocks\, and showing that Witte
n diagrams obey the same equation. We study in detail the semi-classical l
imit\, where conformal blocks are given by the action of a network of bulk
world-lines obeying appropriate geodesic equations. We give an alternate
description in the Chern-Simons formulation of 3D gravity\, where the conf
ormal blocks are described by networks of Wilson lines\, and show that the
se formulations are equivalent.\nhttps://indico.nbi.ku.dk/event/979/contri
butions/7208/
LOCATION:Auditorium A (Niels Bohr Institute)
URL:https://indico.nbi.ku.dk/event/979/contributions/7208/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Puhm: A rough end for smooth microstate geometries
DTSTART;VALUE=DATE-TIME:20170516T080000Z
DTEND;VALUE=DATE-TIME:20170516T090000Z
DTSTAMP;VALUE=DATE-TIME:20211202T184500Z
UID:indico-contribution-7209@indico.nbi.ku.dk
DESCRIPTION:The study of supersymmetric black holes in string theory has b
een a useful arena for the search for the correct microscopic description
of black holes\, with one of its greatest triumphs being the explicit stri
ngy counting by Strominger and Vafa of the number of microstates of the D1
-D5-P system. The fuzzball program is an attempt to describe these microst
ates at finite coupling with the extended objects of string theory modifyi
ng the structure of the black hole horizon by replacing it with an end to
spacetime. An important open question is what fraction of these microstate
s is smooth\, contains singularities corresponding to D-brane sources or i
s arbitrarily quantum and/or strongly curved. Recently Eperon\, Reall\, an
d Santos identified a non-linear classical instability in these geometries
due to the growth of excitations at an “evanescent ergosurface” of in
finite redshift whose implications for the fuzzball program depend crucial
ly on its endpoint. In this talk I will argue that the instability drives
rare smooth microstates with large angular momentum to more typical micros
tates with smaller angular momentum and terminates when the density of mic
rostates is maximal. At this point\, the large stringy corrections to such
microstates may render them non-linearly stable just as supergravity brea
ks down: a rough end for smooth microstate geometries. I will discuss a po
ssible mechanism for this stabilization detailed in an illustrative toy mo
del.\nhttps://indico.nbi.ku.dk/event/979/contributions/7209/
LOCATION:Auditorium A (Niels Bohr Institute)
URL:https://indico.nbi.ku.dk/event/979/contributions/7209/
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