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BEGIN:VEVENT
SUMMARY:Amihay Hanany (Imperial College London)
DTSTART;VALUE=DATE-TIME:20200514T090000Z
DTEND;VALUE=DATE-TIME:20200514T100000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/1
DESCRIPTION:Title: Higgs mechanism\, Hasse diagrams\, and Quiver subtractions\nby Amiha
y Hanany (Imperial College London) as part of Rencontres Théoriciennes\n\
nLecture held in Zoom.\n\nAbstract\nThe Hasse diagram is a new way of thin
king about moduli spaces of vacua which are hyperKahler cones (otherwise k
nown as symplectic singularities) It incorporates the well established the
ory behind the Higgs mechanism\, as put forward by Kibble 1967\, with geom
etric notions from mathematics\, and modern notions from quiver gauge theo
ries.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tom Hartman (Resultados de la búsqueda Resultados web Cornell Un
iversity)
DTSTART;VALUE=DATE-TIME:20200528T140000Z
DTEND;VALUE=DATE-TIME:20200528T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/2
DESCRIPTION:Title: Replica wormholes and the black hole information paradox\nby Tom Har
tman (Resultados de la búsqueda Resultados web Cornell University) as pa
rt of Rencontres Théoriciennes\n\nLecture held in Institut Henri Poincar
é\, Room 314 unless specified otherwise.\n\nAbstract\nI will review recen
t progress on the black hole information puzzle involving the appearance o
f "islands" in the black hole interior. The islands arise from the replica
trick used to calculate the entropy of Hawking radiation. This entropy re
ceives large non-perturbative corrections from gravitational instantons ca
lled replica wormholes\, which connect multiple copies of the black hole t
hrough the interiors. In several toy models where these contributions can
be calculated explicitly\, the resulting entropy is consistent with unitar
y black hole evaporation.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Costas Bachas (École Normale Supérieure)
DTSTART;VALUE=DATE-TIME:20200625T090000Z
DTEND;VALUE=DATE-TIME:20200625T100000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/3
DESCRIPTION:Title: Coupling Holographic Universes\nby Costas Bachas (École Normale Sup
érieure) as part of Rencontres Théoriciennes\n\nLecture held in Institut
Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nHolog
raphic duality describes coupled AdS Universes by the weak and/or local
ized coupling of CFTs.\nAfter a brief introduction\, I will discuss two re
cent results in this context:\n(1) the top down embedding of massive gr
avity in string theory\, and (2) the transfer of energy across a conforma
l interface.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stephan Stieberger (MPP)
DTSTART;VALUE=DATE-TIME:20200618T090000Z
DTEND;VALUE=DATE-TIME:20200618T100000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/4
DESCRIPTION:Title: Symmetries of celestial amplitudes\nby Stephan Stieberger (MPP) as p
art of Rencontres Théoriciennes\n\nLecture held in Institut Henri Poincar
é\, Room 314 unless specified otherwise.\n\nAbstract\nAbstract: The celes
tial sphere is the target space for the proposal of flat space holography
in which four-dimensional physics is encoded in two-dimensional celestial
conformal field theory (CCFT).\nAfter giving some motivations we introduce
the concepts and properties of physics on the celestial sphere.\nWe shall
discuss symmetries and properties of celestial amplitudes. After introduc
ing the concept of soft theorems on the celestial sphere we shall give an
explicit field realization of the operators generating superrotations and
supertranslations. Finally we construct the full extended BMS Algebra of C
CFT.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anatoly Dymarsky (U. Kentucky & Skoltech)
DTSTART;VALUE=DATE-TIME:20200917T130000Z
DTEND;VALUE=DATE-TIME:20200917T140000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/5
DESCRIPTION:Title: Quantum codes\, lattices\, and conformal field theories\nby Anatoly
Dymarsky (U. Kentucky & Skoltech) as part of Rencontres Théoriciennes\n\n
Lecture held in online only.\n\nAbstract\nThere is a deep relation between
classical error-correcting\ncodes\, Euclidean lattices\, and chiral 2d CF
Ts. We show this relation\nextends to include quantum codes\, Lorentzian l
attices\, and non-chiral\nCFTs. The relation to quantum codes provides a s
imple way to solve\nmodular bootstrap constraints and identify interesting
examples of\nconformal theories. In particular we construct many examples
of\nphysically distinct isospectral theories\, examples of "would-be" CFT
\npartition function -- non-holomorphic functions satisfying all\nconstrai
nts of the modular bootstrap\, yet not associated with any\nknown CFT\, an
d find theory with the maximal spectral gap among all\nNarain CFTs with th
e central charge c=4. We also discuss averaging\nover the ensemble of all
CFTs associated with quantum codes\, and its\npossible holographic interpr
etation. The talk is based on\narXiv:2009.01236 and arXiv:2009.01244.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Juan Maldacena (IAS)
DTSTART;VALUE=DATE-TIME:20200924T130000Z
DTEND;VALUE=DATE-TIME:20200924T140000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/7
DESCRIPTION:Title: Humanly traversable wormholes\nby Juan Maldacena (IAS) as part of Re
ncontres Théoriciennes\n\n\nAbstract\nWe will review the construction of
traversable wormhole solutions in four dimensions. The simplest constructi
on involves magnetic fields and charged massless fermions. These are ingre
dients found in the Standard Model at very short distances\, giving us pos
sible microscopic wormholes. One can have larger wormholes\, such as the o
nes 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://researchseminars.org/talk/RENC-THEO/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberto Emparan (U. Barcelona)
DTSTART;VALUE=DATE-TIME:20201008T090000Z
DTEND;VALUE=DATE-TIME:20201008T100000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
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 fr
amework of braneworld holography as a means of studying quantum effects on
black holes including the gravitational backreaction of strongly-coupled
conformal fields. Then I will describe a holographic construction of quant
um rotating BTZ black holes (quBTZ) using an exact four-dimensional bulk s
olution. Besides yielding the quantum-corrected geometry and the renormali
zed stress tensor of quBTZ\, we use it to show that the quantum black hole
entropy\, which includes the entanglement of the fields outside the horiz
on\, rather non-trivially satisfies the first law of thermodynamics\, whil
e the Bekenstein-Hawking-Wald entropy does not.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Céline Zwikel (TU Wien)
DTSTART;VALUE=DATE-TIME:20201001T090000Z
DTEND;VALUE=DATE-TIME:20201001T101500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/10
DESCRIPTION:Title: Symmetries at Null Boundaries\nby Céline Zwikel (TU Wien) as part
of Rencontres Théoriciennes\n\nLecture held in Institut Henri Poincaré\,
Room 314 unless specified otherwise.\n\nAbstract\nI will present and moti
vate a program establishing\, in full generality\, the symmetries and char
ge analysis for gravitational theories near a generic null hypersurface wi
thout specifying any boundary condition. I will illustrate the first step
s of this program on three dimensional Einstein gravity. In this case\, th
ere are three charges which are generic functions over the codimension one
null surface. The integrability of the charges and the charge algebra dep
end on the state-dependence of symmetry generators which is a priori not s
pecified. I will establish the existence of infinitely many choices that r
ender 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 developi
ng some aspects of the four dimensional case. Finally\, I will put our res
ults in the context of earlier constructions of near horizon symmetries.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ben Craps (Vrije Universiteit Brussel)
DTSTART;VALUE=DATE-TIME:20201022T090000Z
DTEND;VALUE=DATE-TIME:20201022T101500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/11
DESCRIPTION:Title: Slow scrambling in extremal BTZ and microstate geometries\nby Ben C
raps (Vrije Universiteit Brussel) as part of Rencontres Théoriciennes\n\n
\nAbstract\nOut-of-time-order correlators (OTOCs) that capture maximally c
haotic properties of a black hole are determined by scattering processes n
ear the horizon. This prompts the question to what extent OTOCs display ch
aotic behaviour in horizonless microstate geometries. This question is com
plicated by the fact that Lyapunov growth of OTOCs requires nonzero temper
ature\, whereas constructions of microstate geometries have been mostly re
stricted to extremal black holes. \n\n\nWe compute OTOCs for a class of ex
tremal black holes\, namely maximally rotating BTZ black holes\, and show
that on average they display "slow scrambling"\, characterized by cubic (r
ather than exponential) growth. Superposed on this average power-law growt
h is a sawtooth pattern\, whose steep parts correspond to brief periods 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 "superstrata"\, ho
rizonless microstate geometries corresponding to these black holes. Rather
than an infinite throat ending on a horizon\, these geometries have a ver
y deep but finite throat ending in a cap. We find that the superstrata dis
play the same slow scrambling as maximally rotating BTZ black holes\, exce
pt that for large enough time intervals the growth of the OTOC is cut off
by effects related to the cap region\, some of which we evaluate explicitl
y.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andreas Braun (Durham University)
DTSTART;VALUE=DATE-TIME:20201105T100000Z
DTEND;VALUE=DATE-TIME:20201105T111500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/12
DESCRIPTION:Title: Adiabatic Fibrations\, String Dualities and Exceptional Holonomy\nb
y Andreas Braun (Durham University) as part of Rencontres Théoriciennes\n
\nLecture held in Institut Henri Poincaré\, Room 314 unless specified oth
erwise.\n\nAbstract\nNew instances of dualities between string compactific
ations can often be understood as a fibre-wise application of known dualit
ies. After a review of classic results\, I will give an overview of new in
stances of such dualities in the context of manifolds of exceptional holon
omy - G2 and Spin(7) - as well as an introduction to the physics related t
o such\ngeometries.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francesco Benini (SISSA)
DTSTART;VALUE=DATE-TIME:20201126T100000Z
DTEND;VALUE=DATE-TIME:20201126T111500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/13
DESCRIPTION:Title: Superconformal index and gravitational path-integral\nby Francesco
Benini (SISSA) as part of Rencontres Théoriciennes\n\nLecture held in Ins
titut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\n
AdS/CFT provides a consistent non-perturbative definition of quantum gravi
ty in asymptotically AdS spacetimes. Black holes should correspond to ense
mbles of states in the boundary field theory. By performing a careful anal
ysis of the superconformal index of 4d N=4 SU(N) Super-Yang-Mills theory\,
with the help of a Bethe Ansatz type formula\, we are able to exactly rep
roduce 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-integr
al. Along the way we propose a necessary condition for complex saddles to
contribute\, based on the size of their non-perturbative corrections. Such
a prescription exactly matches the field theory analysis.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pavel Kovtun (University of Victoria)
DTSTART;VALUE=DATE-TIME:20201029T150000Z
DTEND;VALUE=DATE-TIME:20201029T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
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://researchseminars.org/talk/RENC-THEO/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Massimo Taronna (Naples university)
DTSTART;VALUE=DATE-TIME:20201210T140000Z
DTEND;VALUE=DATE-TIME:20201210T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
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://researchseminars.org/talk/RENC-THEO/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nikolay Bobev (KU Leuven)
DTSTART;VALUE=DATE-TIME:20201112T100000Z
DTEND;VALUE=DATE-TIME:20201112T111500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/16
DESCRIPTION:Title: The unreasonable effectiveness of higher-derivative supergravity in AdS
4 holography\nby Nikolay Bobev (KU Leuven) as part of Rencontres Théo
riciennes\n\nLecture held in Institut Henri Poincaré\, Room 314 unless sp
ecified otherwise.\n\nAbstract\nI will describe the four-derivative correc
tions to four-dimensional N=2 minimal gauged supergravity and show that th
ey are controlled by two constants. Interestingly\, the solutions of the e
quations of motion in the two-derivative theory are not modified by the hi
gher derivative corrections. I will use this to arrive at a general formul
a for the regularized on shell action for any asymptotically locally AdS4
solution of the theory and show how the higher-derivative corrections affe
ct black hole thermodynamic quantities in a universal way. I will employ t
hese results in the context of holography to derive new explicit results f
or the subleading corrections in the large N expansion of supersymmetric p
artition functions on various compact manifolds for a large class of three
-dimensional SCFTs arising from M2- and M5-branes. I will also briefly dis
cuss possible extensions and generalizations of these results.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ulf Danielsson (Uppsala University)
DTSTART;VALUE=DATE-TIME:20201119T100000Z
DTEND;VALUE=DATE-TIME:20201119T111500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/17
DESCRIPTION:Title: A journey out of the swamp riding a dark bubble\nby Ulf Danielsson
(Uppsala University) as part of Rencontres Théoriciennes\n\nLecture held
in Institut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbst
ract\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 d
iscuss how matter on the bubble is induced from hanging strings ending on
the bubble. The construction provides a new way to understand the cosmolog
ical horizon\, and there are also implications for particle physics and bl
ack holes.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rajesh Gopakumar (ICTS Bangalore)
DTSTART;VALUE=DATE-TIME:20210121T100000Z
DTEND;VALUE=DATE-TIME:20210121T111500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/18
DESCRIPTION:Title: From Symmetric Product CFTs to AdS$_3$\nby Rajesh Gopakumar (ICTS B
angalore) as part of Rencontres Théoriciennes\n\nLecture held in Institut
Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nHow e
xactly do large N QFTs reassemble themselves into perturbative string theo
ries? This talk will focus on an example which explicitly illustrates a ge
neral program of how this can happen around a free field fixed point. Spec
ifically\, we consider n-point correlators in the symmetric product orbifo
ld theory\, dual to tensionless strings on AdS_3\, in a Gross-Mende like l
imit of large conformal dimensions. These correlators are given in terms o
f branched covering maps which we can exactly solve for in this limit\, vi
a a map to a matrix model with a logarithmic potential. The spectral curve
encoding the matrix model solution then naturally gives rise to an integr
al over the dual string moduli space through a special (Strebel) parameter
ization of the latter. This is a precise realisation of what was proposed
as the underlying mechanism for gauge-string duality in weakly coupled QFT
S. Finally\, the integrand on the moduli space can be cast in a number of
striking forms including an action given by (the modulus of) the Schwarzia
n of the covering map.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eric Perlmutter (Caltech & IPhT)
DTSTART;VALUE=DATE-TIME:20210128T100000Z
DTEND;VALUE=DATE-TIME:20210128T111500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/19
DESCRIPTION:Title: A CFT Distance Conjecture\nby Eric Perlmutter (Caltech & IPhT) as p
art of Rencontres Théoriciennes\n\nLecture held in Institut Henri Poincar
é\, Room 314 unless specified otherwise.\n\nAbstract\nWe formulate a seri
es of conjectures relating the geometry of conformal manifolds to the spec
trum of local operators in conformal field theories in d>2 spacetime dimen
sions. We focus on conformal manifolds with limiting points at infinite di
stance with respect to the Zamolodchikov metric. Our central conjecture is
that all theories at infinite distance possess an emergent higher-spin sy
mmetry\, generated by an infinite tower of currents whose anomalous dimens
ions vanish exponentially in the distance. Stated geometrically\, the diam
eter of a non-compact conformal manifold must diverge logarithmically in t
he higher-spin gap. Our conjectures are related to the Distance Conjecture
in the swampland program. We discuss the supporting evidence\, their holo
graphic interpretation\, and implications for superconformal field theorie
s.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Justin Kaidi (SCGP Stony Brook)
DTSTART;VALUE=DATE-TIME:20201203T140000Z
DTEND;VALUE=DATE-TIME:20201203T151500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/20
DESCRIPTION:Title: Adventures in Non-Supersymmetric String Theory\nby Justin Kaidi (SC
GP 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 strings\
, as well as a series of seven heterotic strings\, all of which are obtain
ed by imposing unconventional GSO projections. Besides these classic examp
les though\, relatively little is known about the full space of non-SUSY t
heories. One of the reasons why non-SUSY strings have remained understudie
d is the fact that nearly all of them have closed string tachyons\, and he
nce do not admit ten-dimensional flat space as a stable vacuum. The goal o
f this talk is two-fold. First\, using recent advances in condensed matter
theory\, we will reinterpret GSO projections in terms of topological phas
es of matter\, thereby providing a framework for the classification of non
-SUSY strings. Having done so\, we will show that for all non-SUSY theorie
s in which a tachyon exists\, it can be condensed to give a stable lower-d
imensional vacuum. In many cases\, these stable vacua will be two-dimensio
nal string theories already known in the literature.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gordon Semenoff (UBC)
DTSTART;VALUE=DATE-TIME:20201217T150000Z
DTEND;VALUE=DATE-TIME:20201217T161500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/21
DESCRIPTION:Title: Infrared information: an accelerated quark paradigm\nby Gordon Seme
noff (UBC) as part of Rencontres Théoriciennes\n\nLecture held in Institu
t Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nSome
observations about the interplay of quantum information theoretic issues
and the infrared problem in gauge field theories are reviewed. A simple m
odel of a quantum amplitude computation for accelerated heavy quarks in N=
4 supersymmetric Yang-Mills theory is formulated and used to study the inf
rared divergences which would arise at the leading order of weak coupling
perturbation theory. It is argued that the answer to some fundamental que
stions about the realization of global colour symmetry depend crucially on
how the infrared problem is resolved. An extrapolation of some aspects of
the discussion to strong coupling and large $N$ using AdS/CFT holography
are explored.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jan de Boer (Amsterdam)
DTSTART;VALUE=DATE-TIME:20210114T094500Z
DTEND;VALUE=DATE-TIME:20210114T110000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/22
DESCRIPTION:Title: Spacetime as a quantum circuit\nby Jan de Boer (Amsterdam) as part
of Rencontres Théoriciennes\n\nLecture held in Zoom.\n\nAbstract\nI will
review some recent work (arXiv:2101.01185) which proposes to identify the
on-shell\ngravitational action for regions in spacetime with the complexit
y of a suitable quantum circuit\, which significantly extends previous pro
posals on path integral optimization and complexity.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthijs Hogervorst (EPFL)
DTSTART;VALUE=DATE-TIME:20210211T100000Z
DTEND;VALUE=DATE-TIME:20210211T114500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/23
DESCRIPTION:Title: Back to the future with the epsilon expansion\nby Matthijs Hogervor
st (EPFL) as part of Rencontres Théoriciennes\n\nLecture held in Institut
Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nThe e
psilon expansion is a well-known framework in quantum field theory to cons
truct weakly-coupled fixed points of the RG flow. Nevertheless\, little is
known about the landscape of theories it describes\, beyond some well-kno
wn CFTs like the Ising and the O(N) models. In this talk we revisit the pr
oblem of classifying multiscalar fixed points\, in the process proving new
results their spectra. Moreover\, we show that there is no weakly-coupled
gauged fixed point with fewer than 183 flavors.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yu-Tin Huang (National Taiwan University)
DTSTART;VALUE=DATE-TIME:20210225T090000Z
DTEND;VALUE=DATE-TIME:20210225T114500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/24
DESCRIPTION:Title: An EFT/CFT ``Duality": from the modular-hedron to the EFT-hedron\
nby Yu-Tin Huang (National Taiwan University) as part of Rencontres Théor
iciennes\n\nLecture held in Institut Henri Poincaré\, Room 314 unless spe
cified otherwise.\n\nAbstract\nIn this talk we will show that the space of
consistent EFTs and 2D CFTs are governed by the same geometry. For the fo
rmer\, the theory space stems from a four-point S-matrix that is consisten
t with having a crossing symmetric unitary and Lorentz invariant UV comple
tion\, while the latter is deduced from modular invariant torus partition
functions. We will show that in both cases\, the space is given by a produ
ct geometry of convex hull of points on positive moment curves\, intersec
ting with the subplane reflecting crossing/modular symmetry. We will provi
de evidence that a particular vertex of the intersecting geometry gives th
e extremal spectrum of the discretize (derivative expansion) bootstrap pro
blem.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniele Dorigoni (Durham)
DTSTART;VALUE=DATE-TIME:20210311T100000Z
DTEND;VALUE=DATE-TIME:20210311T114500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/25
DESCRIPTION:Title: An exact integrated correlator in $N=4$ SU(N) SYM\nby Daniele Dorig
oni (Durham) as part of Rencontres Théoriciennes\n\nLecture held in Insti
tut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nBe
tween all the magical properties of $\\mathcal{N} = 4$ SU(N) super Yang-Mi
lls perhaps one of the most important is Montonen-Olive electric-magnetic
$SL(2\,Z)$ duality.In particular this leads to the constraint that observa
bles 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 su
ch physical quantity\, namely an integrated correlator of four super-confo
rmal primaries of the stress-tensor multiplet. I will firstly review how t
his 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 the comp
lex YM coupling \\tau. Thanks to this novel expression we can explore vari
ous different regimes: perturbative SYM\, large-N supergravity approximati
on\, 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=1234\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Guerrieri (Tel-Aviv)
DTSTART;VALUE=DATE-TIME:20210318T090000Z
DTEND;VALUE=DATE-TIME:20210318T093000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/26
DESCRIPTION:Title: Where is String Theory?\nby Andrea Guerrieri (Tel-Aviv) as part of
Rencontres Théoriciennes\n\nLecture held in Institut Henri Poincaré\, Ro
om 314 unless specified otherwise.\n\nAbstract\nIn the recent past the S-m
atrix Bootstrap has provided precise quantitative bounds on the low energy
Wilson coefficients compatible with causality\, crossing symmetry and uni
tarity for some class of EFTs associated with the low energy QCD dynamics.
In this talk I will discuss the first application of this formalism to qu
antum gravity theories. I will focus on the first non universal correction
to the flat space scattering amplitude of 10 dimensional supergravity par
ticles\, and compare the results with the String Theory predictions.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Blaise Goutéraux (Ecole Polytechnique)
DTSTART;VALUE=DATE-TIME:20210325T100000Z
DTEND;VALUE=DATE-TIME:20210325T114500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/27
DESCRIPTION:Title: Hydrodynamic diffusion and its breakdown near AdS2 fixed points\nby
Blaise Goutéraux (Ecole Polytechnique) as part of Rencontres Théoricien
nes\n\nLecture held in Institut Henri Poincaré\, Room 314 unless specifie
d otherwise.\n\nAbstract\nHydrodynamics provides a universal description o
f interacting quantum field theories at sufficiently long times and wavele
ngths\, but breaks down at scales dependent on microscopic details of the
theory. We use gauge-gravity duality to investigate the breakdown of diffu
sive hydrodynamics in two low temperature states dual to black holes with
AdS$_2$ horizons. We find that the breakdown is characterized by a collisi
on 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 local eq
uilibration time is set by infra-red properties of the theory. The absolut
e values of the frequency and wavevector at the collision ($\\omega_{eq}$
and $k_{eq}$) provide a natural characterization of all the low temperatur
e diffusivities $D$ of the states via $D=\\omega_{eq}/k_{eq}^2$ where $\\o
mega_{eq}=2\\pi\\Delta T$ is set by the temperature $T$ and the scaling di
mension $\\Delta$ of an infra-red operator. We confirm that these relation
s are also satisfied in an SYK chain model in the limit of strong interact
ions.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rob Myers (Perimeter Institute)
DTSTART;VALUE=DATE-TIME:20210401T130000Z
DTEND;VALUE=DATE-TIME:20210401T141500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/28
DESCRIPTION:Title: Quantum Extremal Islands made easy\nby Rob Myers (Perimeter Institu
te) as part of Rencontres Théoriciennes\n\nLecture held in Institut Henri
Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nWe illustra
te the appearance of quantum extremal islands in holographic setups in hig
her dimensions. We emphasize the close parallel with the behaviour of holo
graphic entanglement entropy in more familiar settings.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aninda Sinha (IISc)
DTSTART;VALUE=DATE-TIME:20210408T090000Z
DTEND;VALUE=DATE-TIME:20210408T101500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
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 Institut Hen
ri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nI will co
nsider fully crossing symmetric dispersion relations for 2-2 scattering of
identical massive scalar scattering in QFT reviving certain old ideas in
the 1970s. I will show how two sided bounds on Wilson coefficients can be
derived using this dispersion relation by establishing the univalence of t
he kernel. I will also discuss how a generalized Froissart bound arises fr
om the same.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simeon Hellerman (Tokyo University)
DTSTART;VALUE=DATE-TIME:20210506T080000Z
DTEND;VALUE=DATE-TIME:20210506T094500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/30
DESCRIPTION:Title: How Different Is More? : Precision correlators at large R-charge\nb
y Simeon Hellerman (Tokyo University) as part of Rencontres Théoriciennes
\n\nLecture held in Institut Henri Poincaré\, Room 314 unless specified o
therwise.\n\nAbstract\nBuilding up macroscopic physics from microscopic co
nstituents is an idea as old as theoretical physics itself\, and has been
a perennial theme in quantum theory beginning with Bohr's correspondence p
rinciple and onward through the modern renormalization group. Recently th
ere has been a semi-organized effort at applying this principle to strongl
y coupled conformal field theory\, developing asymptotic series in inverse
powers of a large quantum number as a systematic approximation scheme who
se leading-order term is the familiar macroscopic limit. I will discuss t
his idea in the case of N=2 superconformal gauge theory in four dimensions
\, where it is possible to compute the large-quantum-number asymptotic ser
ies to all orders and even a hyperasymptotic series for the exponentially
small corrections to it that are associated with the leading qualitative b
reakdown of the naive macroscopic picture. The results quite easily yield
approximations accurate to 4-6 significant digits for quantum numbers 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 lar
ge-scale structure of theory space.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wolfgang Lerche (CERN)
DTSTART;VALUE=DATE-TIME:20210603T090000Z
DTEND;VALUE=DATE-TIME:20210603T103000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/32
DESCRIPTION:Title: Fluxes\, Holomorphic Anomalies and Elliptic Genera in $d=4$\nby Wol
fgang Lerche (CERN) as part of Rencontres Théoriciennes\n\nLecture held i
n Institut Henri Poincaré\, Room 314 unless specified otherwise.\n\nAbstr
act\nMotivated by tests of Weak Gravity Conjectures\, we investigate prope
rties of elliptic genera of string theories that arise in large distance l
imits of the moduli space of F-theory compactifications. This allows for a
non-perturbative definition of elliptic genera that goes beyond the ordin
ary world-sheet description. While this construction has been known for si
x-dimensional theories\, we find the four-dimensional variant to be surpri
singly complex. The essential new ingredient is background fluxes\, and th
ese lead to different sectors of the elliptic genus with different modular
properties. Crucial is the appearance of derivatives which leads to novel
modular (and hence\, holomorphic) anomalies that are worse than naively e
xpected. We also give a physical interpretation of these phenomena.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Douglas Stanford (Stanford)
DTSTART;VALUE=DATE-TIME:20210415T150000Z
DTEND;VALUE=DATE-TIME:20210415T161500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/33
DESCRIPTION:Title: Wormholes without averaging\nby Douglas Stanford (Stanford) as part
of Rencontres Théoriciennes\n\nLecture held in Institut Henri Poincaré\
, Room 314 unless specified otherwise.\n\nAbstract\nSpacetime wormholes ha
ve contributed a lot to recent understanding of quantum black hole physics
\, but they lead to puzzles. One way to resolve the puzzles is to interpre
t the wormholes as computing an average over theories. But what happens if
we don't average? Are the wormholes still there? We will discuss this in
a very simple model\, a reduction of the SYK quantum mechanics model. Afte
r averaging over couplings\, the collective field description contains "wo
rmhole" solutions. We show that the wormhole solutions survive intact in t
he non-averaged theory\, but there are also new "half wormhole" contributi
ons from elsewhere in the integration space.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marc Gillioz (SISSA)
DTSTART;VALUE=DATE-TIME:20210422T090000Z
DTEND;VALUE=DATE-TIME:20210422T101500Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/34
DESCRIPTION:Title: A scattering amplitude in conformal field theory\nby Marc Gillioz (
SISSA) as part of Rencontres Théoriciennes\n\nLecture held in Institut He
nri Poincaré\, Room 314 unless specified otherwise.\n\nAbstract\nThere ar
e no particles in conformal field theory\, but it is still possible to def
ine scattering amplitudes using a conformal version of the LSZ reduction f
ormalism\, which makes use of branch points instead of poles in correlatio
n functions expressed in momentum space. These amplitudes have many famili
ar properties\, including crossing symmetry and unitarity cuts. They match
ordinary scattering amplitudes in perturbative examples\, but are truly n
on-perturbative and can potentially be used as a new approach to bootstrap
a theory.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Grimm (Utrecht)
DTSTART;VALUE=DATE-TIME:20210916T080000Z
DTEND;VALUE=DATE-TIME:20210916T090000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/35
DESCRIPTION:Title: Asymptotic Flux Compactifications and the Tameness of the Landscape
\nby Thomas Grimm (Utrecht) as part of Rencontres Théoriciennes\n\nLectur
e held in Institut Henri Poincaré\, Room 314 in hybrid mode.\n\nAbstract\
nIt has only recently become possible to systematically study flux compact
ifications in asymptotic regions of the field space without the necessity
to construct specific geometric examples. I will explain some key insights
about the structure of the complex structure moduli space\, its boundarie
s and asymptotic regions\, that opened the door for this general approach.
I will then argue that a long conjectured and very non-trivial finiteness
result about flux vacua has now been proved. Motivated by these successes
\, I will suggest that requiring finiteness properties on the coupling fun
ctions of any effective theory could be key to generally uncover the struc
ture of the string theory landscape. I will briefly introduce a concrete f
ramework\, dealing with o-minimal structures and tame topology\, that auto
matically implements finiteness properties.\n\nZoom code: 1234\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cyril Closset (Birmingham)
DTSTART;VALUE=DATE-TIME:20210916T093000Z
DTEND;VALUE=DATE-TIME:20210916T103000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/36
DESCRIPTION:Title: The Coulomb branch of 5d superconformal field theories on a circle\
nby Cyril Closset (Birmingham) as part of Rencontres Théoriciennes\n\nLec
ture held in Institut Henri Poincaré\, Room 314 in hybrid mode.\n\nAbstra
ct\nI will revisit the Seiberg-Witten description of the Coulomb branch of
rank-one 4d N=2 supersymmetric QFTs\, including aspects of the global sym
metry\, from the point of view of rational elliptic surfaces. This will in
clude\, in particular\, a detailed study of the 5d superconformal field th
eories with E_n symmetry\, compactified on a circle. I will also sketch ho
w to derive BPS quivers from that perspective. Interesting modular propert
ies of the SW geometries will play a key role.\n\nZoom code: 1234\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leron Borsten (Heriot–Watt University\, Edinburgh)
DTSTART;VALUE=DATE-TIME:20211021T093000Z
DTEND;VALUE=DATE-TIME:20211021T103000Z
DTSTAMP;VALUE=DATE-TIME:20230208T071845Z
UID:RENC-THEO/37
DESCRIPTION:Title: On colour-kinematic duality and the double copy\nby Leron Borsten (
Heriot–Watt University\, Edinburgh) as part of Rencontres Théoriciennes
\n\nLecture held in Institut Henri Poincaré\, Room 314 unless specified o
therwise.\n\nAbstract\nWe begin by reviewing the colour-kinematics duality
of (super) Yang-Mills theory and its double copy into (super)gravity.\nWe
then show that off-shell colour-kinematics duality can be made manifest i
n the Yang—Mills Batalin–Vilkovisky action\, up to Jacobian counter-te
rms. This\, in turn\, implies the validity of the double copy to all order
s in perturbations theory.\nWe then describe the mathematical underpinning
s of these observations in terms of Homotopy algebras. Figuratively\, colo
ur-kinematics duality is a symmetry of Yang—Mills in the same sense that
a mug is a donut.\nWe conclude by discussing generalisations to super Yan
g-Mills theory\, where Sen’s formalism for self-dual field strengths eme
rges automatically.\n
LOCATION:https://researchseminars.org/talk/RENC-THEO/37/
END:VEVENT
END:VCALENDAR