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BEGIN:VEVENT
SUMMARY:Amihay Hanany (Imperial College London)
DTSTART:20200514T090000Z
DTEND:20200514T100000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/1
DESCRIPTION:Title: Higgs mechanism\, Hasse diagrams\, and Quiver subtractions\nb
y Amihay Hanany (Imperial College London) as part of Rencontres Théoricie
nnes\n\nLecture held in Zoom.\n\nAbstract\nThe Hasse diagram is a new way
of thinking about moduli spaces of vacua which are hyperKahler cones (othe
rwise known as symplectic singularities) It incorporates the well establis
hed theory behind the Higgs mechanism\, as put forward by Kibble 1967\, wi
th geometric notions from mathematics\, and modern notions from quiver gau
ge theories.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tom Hartman (Resultados de la búsqueda Resultados web Cornell Un
iversity)
DTSTART:20200528T140000Z
DTEND:20200528T150000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/2
DESCRIPTION:Title: Replica wormholes and the black hole information paradox\nby
Tom Hartman (Resultados de la búsqueda Resultados web Cornell University
) as part of Rencontres Théoriciennes\n\nLecture held in Institut Henri P
oincaré\, Room 314 unless specified otherwise.\n\nAbstract\nI will review
recent progress on the black hole information puzzle involving the appear
ance of "islands" in the black hole interior. The islands arise from the r
eplica trick used to calculate the entropy of Hawking radiation. This entr
opy receives large non-perturbative corrections from gravitational instant
ons called replica wormholes\, which connect multiple copies of the black
hole through the interiors. In several toy models where these contribution
s can be calculated explicitly\, the resulting entropy is consistent with
unitary black hole evaporation.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Costas Bachas (École Normale Supérieure)
DTSTART:20200625T090000Z
DTEND:20200625T100000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/3
DESCRIPTION:Title: Coupling Holographic Universes\nby Costas Bachas (École Norm
ale Supérieure) as part of Rencontres Théoriciennes\n\nLecture held in I
nstitut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract
\nHolographic duality describes coupled AdS Universes by the weak and/o
r localized coupling of CFTs.\nAfter a brief introduction\, I will discuss
two recent results in this context:\n(1) the top down embedding of mas
sive gravity in string theory\, and (2) the transfer of energy across a c
onformal interface.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stephan Stieberger (MPP)
DTSTART:20200618T090000Z
DTEND:20200618T100000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/4
DESCRIPTION:Title: Symmetries of celestial amplitudes\nby Stephan Stieberger (MP
P) as part of Rencontres Théoriciennes\n\nLecture held in Institut Henri
Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nAbstract: Th
e celestial sphere is the target space for the proposal of flat space holo
graphy in which four-dimensional physics is encoded in two-dimensional cel
estial conformal field theory (CCFT).\nAfter giving some motivations we in
troduce the concepts and properties of physics on the celestial sphere.\nW
e shall discuss symmetries and properties of celestial amplitudes. After i
ntroducing the concept of soft theorems on the celestial sphere we shall g
ive an explicit field realization of the operators generating superrotatio
ns and supertranslations. Finally we construct the full extended BMS Algeb
ra of CCFT.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anatoly Dymarsky (U. Kentucky & Skoltech)
DTSTART:20200917T130000Z
DTEND:20200917T140000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/5
DESCRIPTION:Title: Quantum codes\, lattices\, and conformal field theories\nby A
natoly Dymarsky (U. Kentucky & Skoltech) as part of Rencontres Théoricien
nes\n\nLecture held in online only.\n\nAbstract\nThere is a deep relation
between classical error-correcting\ncodes\, Euclidean lattices\, and chira
l 2d CFTs. We show this relation\nextends to include quantum codes\, Loren
tzian lattices\, and non-chiral\nCFTs. The relation to quantum codes provi
des a simple way to solve\nmodular bootstrap constraints and identify inte
resting examples of\nconformal theories. In particular we construct many e
xamples of\nphysically distinct isospectral theories\, examples of "would-
be" CFT\npartition function -- non-holomorphic functions satisfying all\nc
onstraints of the modular bootstrap\, yet not associated with any\nknown C
FT\, and find theory with the maximal spectral gap among all\nNarain CFTs
with the central charge c=4. We also discuss averaging\nover the ensemble
of all CFTs associated with quantum codes\, and its\npossible holographic
interpretation. The talk is based on\narXiv:2009.01236 and arXiv:2009.0124
4.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Juan Maldacena (IAS)
DTSTART:20200924T130000Z
DTEND:20200924T140000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/7
DESCRIPTION:Title: Humanly traversable wormholes\nby Juan Maldacena (IAS) as par
t of Rencontres Théoriciennes\n\n\nAbstract\nWe will review the construct
ion of traversable wormhole solutions in four dimensions. The simplest con
struction involves magnetic fields and charged massless fermions. These ar
e ingredients found in the Standard Model at very short distances\, giving
us possible microscopic wormholes. One can have larger wormholes\, such a
s the ones that would allow a person to travel\, by adding an extra "dark
sector" with suitable massless matter. One particular example involves the
Randal Sundrum II model.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberto Emparan (U. Barcelona)
DTSTART:20201008T090000Z
DTEND:20201008T100000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/9
DESCRIPTION:Title: Quantum BTZ black hole\nby Roberto Emparan (U. Barcelona) as
part of Rencontres Théoriciennes\n\n\nAbstract\nI will begin by reviewing
the framework of braneworld holography as a means of studying quantum eff
ects on black holes including the gravitational backreaction of strongly-c
oupled conformal fields. Then I will describe a holographic construction o
f quantum rotating BTZ black holes (quBTZ) using an exact four-dimensional
bulk solution. Besides yielding the quantum-corrected geometry and the re
normalized stress tensor of quBTZ\, we use it to show that the quantum bla
ck hole entropy\, which includes the entanglement of the fields outside th
e horizon\, rather non-trivially satisfies the first law of thermodynamics
\, while the Bekenstein-Hawking-Wald entropy does not.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Céline Zwikel (TU Wien)
DTSTART:20201001T090000Z
DTEND:20201001T101500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/10
DESCRIPTION:Title: Symmetries at Null Boundaries\nby Céline Zwikel (TU Wien) a
s part of Rencontres Théoriciennes\n\nLecture held in Institut Henri Poin
caré\, Room 314 unless specified otherwise.\n\nAbstract\nI will present a
nd motivate a program establishing\, in full generality\, the symmetries a
nd charge analysis for gravitational theories near a generic null hypersur
face without specifying any boundary condition. I will illustrate the fir
st steps of this program on three dimensional Einstein gravity. In this ca
se\, there are three charges which are generic functions over the codimens
ion one null surface. The integrability of the charges and the charge alge
bra depend on the state-dependence of symmetry generators which is a prior
i not specified. I will establish the existence of infinitely many choices
that render the surface charges integrable. Then\, I will argue that one
expects this result to be valid for d > 3 when there is no Bondi news by d
eveloping some aspects of the four dimensional case. Finally\, I will put
our results in the context of earlier constructions of near horizon symmet
ries.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ben Craps (Vrije Universiteit Brussel)
DTSTART:20201022T090000Z
DTEND:20201022T101500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/11
DESCRIPTION:Title: Slow scrambling in extremal BTZ and microstate geometries\nb
y Ben Craps (Vrije Universiteit Brussel) as part of Rencontres Théoricien
nes\n\n\nAbstract\nOut-of-time-order correlators (OTOCs) that capture maxi
mally chaotic properties of a black hole are determined by scattering proc
esses near the horizon. This prompts the question to what extent OTOCs dis
play chaotic behaviour in horizonless microstate geometries. This question
is complicated by the fact that Lyapunov growth of OTOCs requires nonzero
temperature\, whereas constructions of microstate geometries have been mo
stly restricted to extremal black holes. \n\n\nWe compute OTOCs for a clas
s of extremal black holes\, namely maximally rotating BTZ black holes\, an
d show that on average they display "slow scrambling"\, characterized by c
ubic (rather than exponential) growth. Superposed on this average power-la
w growth is a sawtooth pattern\, whose steep parts correspond to brief per
iods of Lyapunov growth associated to the nonzero temperature of the right
-moving degrees of freedom in a dual conformal field theory. \n\n\nNext we
study the extent to which these OTOCs are modified in certain "superstrat
a"\, horizonless microstate geometries corresponding to these black holes.
Rather than an infinite throat ending on a horizon\, these geometries hav
e a very deep but finite throat ending in a cap. We find that the superstr
ata display the same slow scrambling as maximally rotating BTZ black holes
\, except that for large enough time intervals the growth of the OTOC is c
ut off by effects related to the cap region\, some of which we evaluate ex
plicitly.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andreas Braun (Durham University)
DTSTART:20201105T100000Z
DTEND:20201105T111500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/12
DESCRIPTION:Title: Adiabatic Fibrations\, String Dualities and Exceptional Holonomy
\nby Andreas Braun (Durham University) as part of Rencontres Théorici
ennes\n\nLecture held in Institut Henri Poincaré\, Room 314 unless specif
ied otherwise.\n\nAbstract\nNew instances of dualities between string comp
actifications can often be understood as a fibre-wise application of known
dualities. After a review of classic results\, I will give an overview of
new instances of such dualities in the context of manifolds of exceptiona
l holonomy - G2 and Spin(7) - as well as an introduction to the physics re
lated to such\ngeometries.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francesco Benini (SISSA)
DTSTART:20201126T100000Z
DTEND:20201126T111500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/13
DESCRIPTION:Title: Superconformal index and gravitational path-integral\nby Fra
ncesco Benini (SISSA) as part of Rencontres Théoriciennes\n\nLecture held
in Institut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbs
tract\nAdS/CFT provides a consistent non-perturbative definition of quantu
m gravity in asymptotically AdS spacetimes. Black holes should correspond
to ensembles of states in the boundary field theory. By performing a caref
ul analysis of the superconformal index of 4d N=4 SU(N) Super-Yang-Mills t
heory\, with the help of a Bethe Ansatz type formula\, we are able to exac
tly reproduce the Bekenstein-Hawking entropy of BPS black holes in AdS5 x
S5. The large N limit exhibits many competing contributions\, that we are
able to identify with complex saddles of the (putative) gravitational path
-integral. Along the way we propose a necessary condition for complex sadd
les to contribute\, based on the size of their non-perturbative correction
s. Such a prescription exactly matches the field theory analysis.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pavel Kovtun (University of Victoria)
DTSTART:20201029T150000Z
DTEND:20201029T160000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/14
DESCRIPTION:by Pavel Kovtun (University of Victoria) as part of Rencontres
Théoriciennes\n\nLecture held in Institut Henri Poincaré\, Room 314 unl
ess specified otherwise.\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Massimo Taronna (Naples university)
DTSTART:20201210T140000Z
DTEND:20201210T150000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/15
DESCRIPTION:by Massimo Taronna (Naples university) as part of Rencontres T
héoriciennes\n\nLecture held in Institut Henri Poincaré\, Room 314 unles
s specified otherwise.\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nikolay Bobev (KU Leuven)
DTSTART:20201112T100000Z
DTEND:20201112T111500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/16
DESCRIPTION:Title: The unreasonable effectiveness of higher-derivative supergravity
in AdS4 holography\nby Nikolay Bobev (KU Leuven) as part of Rencontre
s Théoriciennes\n\nLecture held in Institut Henri Poincaré\, Room 314 un
less specified otherwise.\n\nAbstract\nI will describe the four-derivative
corrections to four-dimensional N=2 minimal gauged supergravity and show
that they are controlled by two constants. Interestingly\, the solutions o
f the equations of motion in the two-derivative theory are not modified by
the higher derivative corrections. I will use this to arrive at a general
formula for the regularized on shell action for any asymptotically locall
y AdS4 solution of the theory and show how the higher-derivative correctio
ns affect black hole thermodynamic quantities in a universal way. I will e
mploy these results in the context of holography to derive new explicit re
sults for the subleading corrections in the large N expansion of supersymm
etric partition functions on various compact manifolds for a large class o
f three-dimensional SCFTs arising from M2- and M5-branes. I will also brie
fly discuss possible extensions and generalizations of these results.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ulf Danielsson (Uppsala University)
DTSTART:20201119T100000Z
DTEND:20201119T111500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/17
DESCRIPTION:Title: A journey out of the swamp riding a dark bubble\nby Ulf Dani
elsson (Uppsala University) as part of Rencontres Théoriciennes\n\nLectur
e held in Institut Henri Poincaré\, Room 314 unless specified otherwise.\
n\nAbstract\nI will discuss how dark energy can be realized using unstable
AdS\, with our universe riding an expanding bubble of true vacuum. I will
also discuss how matter on the bubble is induced from hanging strings end
ing on the bubble. The construction provides a new way to understand the c
osmological horizon\, and there are also implications for particle physics
and black holes.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rajesh Gopakumar (ICTS Bangalore)
DTSTART:20210121T100000Z
DTEND:20210121T111500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/18
DESCRIPTION:Title: From Symmetric Product CFTs to AdS$_3$\nby Rajesh Gopakumar
(ICTS Bangalore) as part of Rencontres Théoriciennes\n\nLecture held in I
nstitut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract
\nHow exactly do large N QFTs reassemble themselves into perturbative stri
ng theories? This talk will focus on an example which explicitly illustrat
es a general program of how this can happen around a free field fixed poin
t. Specifically\, we consider n-point correlators in the symmetric product
orbifold theory\, dual to tensionless strings on AdS_3\, in a Gross-Mende
like limit of large conformal dimensions. These correlators are given in
terms of branched covering maps which we can exactly solve for in this lim
it\, via a map to a matrix model with a logarithmic potential. The spectra
l curve encoding the matrix model solution then naturally gives rise to an
integral over the dual string moduli space through a special (Strebel) pa
rameterization of the latter. This is a precise realisation of what was pr
oposed as the underlying mechanism for gauge-string duality in weakly coup
led QFTS. Finally\, the integrand on the moduli space can be cast in a num
ber of striking forms including an action given by (the modulus of) the Sc
hwarzian of the covering map.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eric Perlmutter (Caltech & IPhT)
DTSTART:20210128T100000Z
DTEND:20210128T111500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/19
DESCRIPTION:Title: A CFT Distance Conjecture\nby Eric Perlmutter (Caltech & IPh
T) as part of Rencontres Théoriciennes\n\nLecture held in Institut Henri
Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nWe formulate
a series of conjectures relating the geometry of conformal manifolds to t
he spectrum of local operators in conformal field theories in d>2 spacetim
e dimensions. We focus on conformal manifolds with limiting points at infi
nite distance with respect to the Zamolodchikov metric. Our central conjec
ture is that all theories at infinite distance possess an emergent higher-
spin symmetry\, generated by an infinite tower of currents whose anomalous
dimensions vanish exponentially in the distance. Stated geometrically\, t
he diameter of a non-compact conformal manifold must diverge logarithmical
ly in the higher-spin gap. Our conjectures are related to the Distance Con
jecture in the swampland program. We discuss the supporting evidence\, the
ir holographic interpretation\, and implications for superconformal field
theories.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Justin Kaidi (SCGP Stony Brook)
DTSTART:20201203T140000Z
DTEND:20201203T151500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/20
DESCRIPTION:Title: Adventures in Non-Supersymmetric String Theory\nby Justin Ka
idi (SCGP Stony Brook) as part of Rencontres Théoriciennes\n\n\nAbstract\
nIt has long been known that there exist strings with supersymmetry on the
world sheet\, but not in spacetime. These include the well-known Type 0 s
trings\, as well as a series of seven heterotic strings\, all of which are
obtained by imposing unconventional GSO projections. Besides these classi
c examples though\, relatively little is known about the full space of non
-SUSY theories. One of the reasons why non-SUSY strings have remained unde
rstudied is the fact that nearly all of them have closed string tachyons\,
and hence do not admit ten-dimensional flat space as a stable vacuum. The
goal of this talk is two-fold. First\, using recent advances in condensed
matter theory\, we will reinterpret GSO projections in terms of topologic
al phases of matter\, thereby providing a framework for the classification
of non-SUSY strings. Having done so\, we will show that for all non-SUSY
theories in which a tachyon exists\, it can be condensed to give a stable
lower-dimensional vacuum. In many cases\, these stable vacua will be two-d
imensional string theories already known in the literature.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gordon Semenoff (UBC)
DTSTART:20201217T150000Z
DTEND:20201217T161500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/21
DESCRIPTION:Title: Infrared information: an accelerated quark paradigm\nby Gord
on Semenoff (UBC) as part of Rencontres Théoriciennes\n\nLecture held in
Institut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstrac
t\nSome observations about the interplay of quantum information theoretic
issues and the infrared problem in gauge field theories are reviewed. A s
imple model of a quantum amplitude computation for accelerated heavy quark
s in N=4 supersymmetric Yang-Mills theory is formulated and used to study
the infrared divergences which would arise at the leading order of weak co
upling perturbation theory. It is argued that the answer to some fundamen
tal questions about the realization of global colour symmetry depend cruci
ally on how the infrared problem is resolved. An extrapolation of some asp
ects of the discussion to strong coupling and large $N$ using AdS/CFT holo
graphy are explored.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jan de Boer (Amsterdam)
DTSTART:20210114T094500Z
DTEND:20210114T110000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/22
DESCRIPTION:Title: Spacetime as a quantum circuit\nby Jan de Boer (Amsterdam) a
s part of Rencontres Théoriciennes\n\nLecture held in Zoom.\n\nAbstract\n
I will review some recent work (arXiv:2101.01185) which proposes to identi
fy the on-shell\ngravitational action for regions in spacetime with the co
mplexity of a suitable quantum circuit\, which significantly extends previ
ous proposals on path integral optimization and complexity.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthijs Hogervorst (EPFL)
DTSTART:20210211T100000Z
DTEND:20210211T114500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/23
DESCRIPTION:Title: Back to the future with the epsilon expansion\nby Matthijs H
ogervorst (EPFL) as part of Rencontres Théoriciennes\n\nLecture held in I
nstitut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract
\nThe epsilon expansion is a well-known framework in quantum field theory
to construct weakly-coupled fixed points of the RG flow. Nevertheless\, li
ttle is known about the landscape of theories it describes\, beyond some w
ell-known CFTs like the Ising and the O(N) models. In this talk we revisit
the problem of classifying multiscalar fixed points\, in the process prov
ing new results their spectra. Moreover\, we show that there is no weakly-
coupled gauged fixed point with fewer than 183 flavors.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yu-Tin Huang (National Taiwan University)
DTSTART:20210225T090000Z
DTEND:20210225T114500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/24
DESCRIPTION:Title: An EFT/CFT ``Duality": from the modular-hedron to the EFT-hedr
on\nby Yu-Tin Huang (National Taiwan University) as part of Rencontres
Théoriciennes\n\nLecture held in Institut Henri Poincaré\, Room 314 unl
ess specified otherwise.\n\nAbstract\nIn this talk we will show that the s
pace of consistent EFTs and 2D CFTs are governed by the same geometry. For
the former\, the theory space stems from a four-point S-matrix that is co
nsistent with having a crossing symmetric unitary and Lorentz invariant UV
completion\, while the latter is deduced from modular invariant torus par
tition functions. We will show that in both cases\, the space is given by
a product geometry of convex hull of points on positive moment curves\, i
ntersecting with the subplane reflecting crossing/modular symmetry. We wil
l provide evidence that a particular vertex of the intersecting geometry g
ives the extremal spectrum of the discretize (derivative expansion) bootst
rap problem.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniele Dorigoni (Durham)
DTSTART:20210311T100000Z
DTEND:20210311T114500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/25
DESCRIPTION:Title: An exact integrated correlator in $N=4$ SU(N) SYM\nby Daniel
e Dorigoni (Durham) as part of Rencontres Théoriciennes\n\nLecture held i
n Institut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstr
act\nBetween all the magical properties of $\\mathcal{N} = 4$ SU(N) super
Yang-Mills perhaps one of the most important is Montonen-Olive electric-ma
gnetic $SL(2\,Z)$ duality.In particular this leads to the constraint that
observables must be invariant under inversion of the complex YM coupling $
\\tau$\, i.e. under $\\tau \\to -1 / \\tau$. In this talk we will focus on
one such physical quantity\, namely an integrated correlator of four supe
r-conformal primaries of the stress-tensor multiplet. I will firstly revie
w how this correlator can be computed via supersymmetric localisation on $
S^4$\, and then discuss how this quantity can be rewritten in a manifestly
$SL(2\,Z)$ invariant way for any number of colours N\, and any value of t
he complex YM coupling \\tau. Thanks to this novel expression we can explo
re various different regimes: perturbative SYM\, large-N supergravity appr
oximation\, large-N 't Hooft expansion. All of these regimes are connected
via a remarkable Laplace-difference equation relating the SU(N) to the SU
(N + 1) and SU(N −\; 1) correlators.\n\nOnline only. Zoom password=12
34\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Guerrieri (Tel-Aviv)
DTSTART:20210318T090000Z
DTEND:20210318T093000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/26
DESCRIPTION:Title: Where is String Theory?\nby Andrea Guerrieri (Tel-Aviv) as p
art of Rencontres Théoriciennes\n\nLecture held in Institut Henri Poincar
é\, Room 314 unless specified otherwise.\n\nAbstract\nIn the recent past
the S-matrix Bootstrap has provided precise quantitative bounds on the low
energy Wilson coefficients compatible with causality\, crossing symmetry
and unitarity for some class of EFTs associated with the low energy QCD dy
namics. In this talk I will discuss the first application of this formalis
m to quantum gravity theories. I will focus on the first non universal cor
rection to the flat space scattering amplitude of 10 dimensional supergrav
ity particles\, and compare the results with the String Theory predictions
.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Blaise Goutéraux (Ecole Polytechnique)
DTSTART:20210325T100000Z
DTEND:20210325T114500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/27
DESCRIPTION:Title: Hydrodynamic diffusion and its breakdown near AdS2 fixed points<
/a>\nby Blaise Goutéraux (Ecole Polytechnique) as part of Rencontres Thé
oriciennes\n\nLecture held in Institut Henri Poincaré\, Room 314 unless s
pecified otherwise.\n\nAbstract\nHydrodynamics provides a universal descri
ption of interacting quantum field theories at sufficiently long times and
wavelengths\, but breaks down at scales dependent on microscopic details
of the theory. We use gauge-gravity duality to investigate the breakdown o
f diffusive hydrodynamics in two low temperature states dual to black hole
s with AdS$_2$ horizons. We find that the breakdown is characterized by a
collision between the diffusive pole of the retarded Green's function with
a pole associated to the AdS$_2$ region of the geometry\, such that the l
ocal equilibration time is set by infra-red properties of the theory. The
absolute values of the frequency and wavevector at the collision ($\\omega
_{eq}$ and $k_{eq}$) provide a natural characterization of all the low tem
perature diffusivities $D$ of the states via $D=\\omega_{eq}/k_{eq}^2$ whe
re $\\omega_{eq}=2\\pi\\Delta T$ is set by the temperature $T$ and the sca
ling dimension $\\Delta$ of an infra-red operator. We confirm that these r
elations are also satisfied in an SYK chain model in the limit of strong i
nteractions.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rob Myers (Perimeter Institute)
DTSTART:20210401T130000Z
DTEND:20210401T141500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/28
DESCRIPTION:Title: Quantum Extremal Islands made easy\nby Rob Myers (Perimeter
Institute) as part of Rencontres Théoriciennes\n\nLecture held in Institu
t Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nWe i
llustrate the appearance of quantum extremal islands in holographic setups
in higher dimensions. We emphasize the close parallel with the behaviour
of holographic entanglement entropy in more familiar settings.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aninda Sinha (IISc)
DTSTART:20210408T090000Z
DTEND:20210408T101500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/29
DESCRIPTION:Title: Crossing symmetric dispersion relations for QFTs\nby Aninda
Sinha (IISc) as part of Rencontres Théoriciennes\n\nLecture held in Insti
tut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nI
will consider fully crossing symmetric dispersion relations for 2-2 scatte
ring of identical massive scalar scattering in QFT reviving certain old id
eas in the 1970s. I will show how two sided bounds on Wilson coefficients
can be derived using this dispersion relation by establishing the univalen
ce of the kernel. I will also discuss how a generalized Froissart bound ar
ises from the same.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simeon Hellerman (Tokyo University)
DTSTART:20210506T080000Z
DTEND:20210506T094500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/30
DESCRIPTION:Title: How Different Is More? : Precision correlators at large R-charge
\nby Simeon Hellerman (Tokyo University) as part of Rencontres Théori
ciennes\n\nLecture held in Institut Henri Poincaré\, Room 314 unless spec
ified otherwise.\n\nAbstract\nBuilding up macroscopic physics from microsc
opic constituents is an idea as old as theoretical physics itself\, and ha
s been a perennial theme in quantum theory beginning with Bohr's correspon
dence principle and onward through the modern renormalization group. Rece
ntly there has been a semi-organized effort at applying this principle to
strongly coupled conformal field theory\, developing asymptotic series in
inverse powers of a large quantum number as a systematic approximation sch
eme whose leading-order term is the familiar macroscopic limit. I will di
scuss this idea in the case of N=2 superconformal gauge theory in four dim
ensions\, where it is possible to compute the large-quantum-number asympto
tic series to all orders and even a hyperasymptotic series for the exponen
tially small corrections to it that are associated with the leading qualit
ative breakdown of the naive macroscopic picture. The results quite easil
y yield approximations accurate to 4-6 significant digits for quantum numb
ers of order 1\, to 15 significant digits or better for quantum numbers of
order 100. I will discuss the implications for one's general picture of
the large-scale structure of theory space.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wolfgang Lerche (CERN)
DTSTART:20210603T090000Z
DTEND:20210603T103000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/32
DESCRIPTION:Title: Fluxes\, Holomorphic Anomalies and Elliptic Genera in $d=4$\
nby Wolfgang Lerche (CERN) as part of Rencontres Théoriciennes\n\nLecture
held in Institut Henri Poincaré\, Room 314 unless specified otherwise.\n
\nAbstract\nMotivated by tests of Weak Gravity Conjectures\, we investigat
e properties of elliptic genera of string theories that arise in large dis
tance limits of the moduli space of F-theory compactifications. This allow
s for a non-perturbative definition of elliptic genera that goes beyond th
e ordinary world-sheet description. While this construction has been known
for six-dimensional theories\, we find the four-dimensional variant to be
surprisingly complex. The essential new ingredient is background fluxes\,
and these lead to different sectors of the elliptic genus with different
modular properties. Crucial is the appearance of derivatives which leads t
o novel modular (and hence\, holomorphic) anomalies that are worse than na
ively expected. We also give a physical interpretation of these phenomena.
\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Douglas Stanford (Stanford)
DTSTART:20210415T150000Z
DTEND:20210415T161500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/33
DESCRIPTION:Title: Wormholes without averaging\nby Douglas Stanford (Stanford)
as part of Rencontres Théoriciennes\n\nLecture held in Institut Henri Poi
ncaré\, Room 314 unless specified otherwise.\n\nAbstract\nSpacetime wormh
oles have contributed a lot to recent understanding of quantum black hole
physics\, but they lead to puzzles. One way to resolve the puzzles is to i
nterpret the wormholes as computing an average over theories. But what hap
pens if we don't average? Are the wormholes still there? We will discuss t
his in a very simple model\, a reduction of the SYK quantum mechanics mode
l. After averaging over couplings\, the collective field description conta
ins "wormhole" solutions. We show that the wormhole solutions survive inta
ct in the non-averaged theory\, but there are also new "half wormhole" con
tributions from elsewhere in the integration space.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marc Gillioz (SISSA)
DTSTART:20210422T090000Z
DTEND:20210422T101500Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/34
DESCRIPTION:Title: A scattering amplitude in conformal field theory\nby Marc Gi
llioz (SISSA) as part of Rencontres Théoriciennes\n\nLecture held in Inst
itut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nT
here are no particles in conformal field theory\, but it is still possible
to define scattering amplitudes using a conformal version of the LSZ redu
ction formalism\, which makes use of branch points instead of poles in cor
relation functions expressed in momentum space. These amplitudes have many
familiar properties\, including crossing symmetry and unitarity cuts. The
y match ordinary scattering amplitudes in perturbative examples\, but are
truly non-perturbative and can potentially be used as a new approach to bo
otstrap a theory.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Grimm (Utrecht)
DTSTART:20210916T080000Z
DTEND:20210916T090000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/35
DESCRIPTION:Title: Asymptotic Flux Compactifications and the Tameness of the Landsc
ape\nby Thomas Grimm (Utrecht) as part of Rencontres Théoriciennes\n\
nLecture held in Institut Henri Poincaré\, Room 314 in hybrid mode.\n\nAb
stract\nIt has only recently become possible to systematically study flux
compactifications in asymptotic regions of the field space without the nec
essity to construct specific geometric examples. I will explain some key i
nsights about the structure of the complex structure moduli space\, its bo
undaries and asymptotic regions\, that opened the door for this general ap
proach. I will then argue that a long conjectured and very non-trivial fin
iteness result about flux vacua has now been proved. Motivated by these su
ccesses\, I will suggest that requiring finiteness properties on the coupl
ing functions of any effective theory could be key to generally uncover th
e structure of the string theory landscape. I will briefly introduce a con
crete framework\, dealing with o-minimal structures and tame topology\, th
at automatically implements finiteness properties.\n\nZoom code: 1234\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cyril Closset (Birmingham)
DTSTART:20210916T093000Z
DTEND:20210916T103000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/36
DESCRIPTION:Title: The Coulomb branch of 5d superconformal field theories on a circ
le\nby Cyril Closset (Birmingham) as part of Rencontres Théoriciennes
\n\nLecture held in Institut Henri Poincaré\, Room 314 in hybrid mode.\n\
nAbstract\nI will revisit the Seiberg-Witten description of the Coulomb br
anch of rank-one 4d N=2 supersymmetric QFTs\, including aspects of the glo
bal symmetry\, from the point of view of rational elliptic surfaces. This
will include\, in particular\, a detailed study of the 5d superconformal f
ield theories with E_n symmetry\, compactified on a circle. I will also sk
etch how to derive BPS quivers from that perspective. Interesting modular
properties of the SW geometries will play a key role.\n\nZoom code: 1234\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leron Borsten (Heriot–Watt University\, Edinburgh)
DTSTART:20211021T093000Z
DTEND:20211021T103000Z
DTSTAMP:20260404T095117Z
UID:RENC-THEO/37
DESCRIPTION:Title: On colour-kinematic duality and the double copy\nby Leron Bo
rsten (Heriot–Watt University\, Edinburgh) as part of Rencontres Théori
ciennes\n\nLecture held in Institut Henri Poincaré\, Room 314 unless spec
ified otherwise.\n\nAbstract\nWe begin by reviewing the colour-kinematics
duality of (super) Yang-Mills theory and its double copy into (super)gravi
ty.\nWe then show that off-shell colour-kinematics duality can be made man
ifest in the Yang—Mills Batalin–Vilkovisky action\, up to Jacobian cou
nter-terms. This\, in turn\, implies the validity of the double copy to al
l orders in perturbations theory.\nWe then describe the mathematical under
pinnings of these observations in terms of Homotopy algebras. Figuratively
\, colour-kinematics duality is a symmetry of Yang—Mills in the same sen
se that a mug is a donut.\nWe conclude by discussing generalisations to su
per Yang-Mills theory\, where Sen’s formalism for self-dual field streng
ths emerges automatically.\n
LOCATION:https://stable.researchseminars.org/talk/RENC-THEO/37/
END:VEVENT
END:VCALENDAR