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BEGIN:VEVENT
SUMMARY:Christopher Herzog (King's College London)
DTSTART:20200520T130000Z
DTEND:20200520T140000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/1
DESCRIPTION:Title: Graphene and boundary conformal field theory\nby Christopher H
erzog (King's College London) as part of SISSA HEP seminars\n\n\nAbstract\
nThe infrared fixed point of graphene under the renormalization group flow
is a relatively under studied yet important example of a boundary conform
al field theory with a number of remarkable properties. It has a close rel
ationship with three dimensional QED. It maps to itself\nunder electric-ma
gnetic duality. Moreover\, it along with its supersymmetric cousins all po
ssess an exactly marginal coupling -- the charge of the electron. I will r
eview past work on this model and also discuss my own contributions which
have focused on understanding the boundary contributions to the anomalous
trace of the stress tensor and their role in helping to understand the str
ucture of boundary conformal field theory. I will also present some result
s on the hemisphere partition function for supergraphene\, its duality pro
perties\, and an exact computation of the conductivity at arbitrary values
of the interaction strength.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Petr Kravchuk (IAS)
DTSTART:20210113T140000Z
DTEND:20210113T150000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/2
DESCRIPTION:Title: Light-ray operators\, detectors\, and OPEs\nby Petr Kravchuk (
IAS) as part of SISSA HEP seminars\n\n\nAbstract\nIn this talk I will revi
ew the recent developments connected to light-ray operators in conformal f
ield theories. Light-ray operators are non-local operators which perform a
n analytic continuation of the usual local operators in spin. In CFTs they
are connected to the recently discovered Lorentzian inversion formula and
to some interesting representation theory. Furthermore\, they can be inte
rpreted as asymptotic observables\, generalizing event shapes such as ener
gy-energy correlators. Finally\, I will discuss how they control the small
-angle limit of energy-energy correlators.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sahand Seifnashri (Stony Brook U. SCGP)
DTSTART:20210210T150000Z
DTEND:20210210T160000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/3
DESCRIPTION:Title: Non-invertible Symmetries and Confinement in 2d Adjoint QCD\nb
y Sahand Seifnashri (Stony Brook U. SCGP) as part of SISSA HEP seminars\n\
n\nAbstract\nAbstract: We will discuss the notion of "non-invertible symme
tries" that generalize group-like symmetries in QFTs. Using these generali
zed symmetries we prove the deconfinement of the fundamental quark in 2d m
assless adjoint QCD. When the adjoint quark has a small mass the theory co
nfines and the non-invertible symmetries are softly broken. We use them to
analytically compute the tension of the confining strings. We will also c
onsider the symmetric quartic fermion deformations that are protected by t
he non-invertible symmetries\, thus violating the ordinary notion of natur
alness.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zoltan Bajnok (Wigner Research Centre for Physics)
DTSTART:20210224T133000Z
DTEND:20210224T143000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/4
DESCRIPTION:Title: From perturbative to non-perturbative in the O(4) sigma model\
nby Zoltan Bajnok (Wigner Research Centre for Physics) as part of SISSA HE
P seminars\n\n\nAbstract\nIs it possible to derive non-perturbative contri
butions in a quantum field theory\nknowing only the perturbative coefficie
nts? We answer this question affirmatively\nbased on the careful analysis
of the integrable two dimensional O(4) sigma model.\nWe investigate its gr
ound state energy in a magnetic field\, for which integrability\nprovides
an exact linear integral equation. By cleverly expanding this equation\nwe
could calculate a large number of very percise\, factorially growing pert
urbative\ncoefficients. By investigating their asymptotical behaviour on t
he Borel plane we\nmanaged to reveal a nice resurgence structure leading t
o the first few exponentially\nsupressed non-perturbative terms of the amb
iguity free trans-series. We checked\nour results against the direct nume
rical solution of the exact integral equation\nand find complete agreement
.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Guido Festuccia (Uppsala)
DTSTART:20210310T133000Z
DTEND:20210310T143000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/5
DESCRIPTION:Title: Consistency of supersymmetric 't Hooft anomalies\nby Guido Fes
tuccia (Uppsala) as part of SISSA HEP seminars\n\n\nAbstract\nI will consi
der recent claims that supersymmetry is anomalous in the presence of a R-s
ymmetry anomaly\, revisit arguments that such an anomaly in supersymmetry
can be removed and write down an explicit counterterm that accomplishes it
. Removal of the supersymmetry anomaly requires enlarging the correspondin
g current multiplet. As a consequence the Ward identities for other symmet
ries that are already anomalous acquire extra terms. This procedure is imp
eded only when the choice of current multiplet is forced. We show how Wess
-Zumino consistency conditions are modified when the anomaly is removed. A
check that the modified Wess-Zumino consistency conditions are satisfied\
, and supersymmetry is unbroken\, is possible via an explicit one loop com
putation using Pauli-Villars regulators.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monica Pate (Harvard)
DTSTART:20210324T150000Z
DTEND:20210324T160000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/6
DESCRIPTION:Title: Scattering Amplitudes on the Celestial sphere\nby Monica Pate
(Harvard) as part of SISSA HEP seminars\n\n\nAbstract\nThe identification
of quantum field theoretic soft theorems with constraints from infinite-di
mensional asymptotic symmetries offers exciting prospects for solving the
scattering problem in quantum gravity. In four spacetime dimensions\, th
e asymptotic symmetry group includes the local conformal (Virasoro) symmet
ry of two dimensions\, motivating the proposal that 4D scattering is hol
ographically dual to a 2D conformal theory. Lorentz symmetry in four dim
ensions comprises the global part of the 2D conformal group of the dual.
Asymptotic particles in boost as opposed to standard momentum eigenstates
transform like primary operators\, and thereby manifestly exhibit the und
erlying conformal symmetry. Scattering amplitudes for such states -- kno
wn as celestial amplitudes -- involve contributions from asymptotic partic
les of arbitrarily high energy and accordingly do not respect the familiar
paradigm of Wilsonian IR/UV decoupling. Nevertheless\, I will describe ho
w various observable IR and UV phenomena can be canonically extracted dire
ctly from celestial amplitudes. Moreover\, a manifestly Lorentz covariant
formulation of scattering constraints is necessary for their direct appli
cation to celestial amplitudes. I will explain how constraints from Poinc
are symmetry\, soft UV behavior of quantum gravity\, and asymptotic symmet
ries are covariantly implemented in celestial amplitudes.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kristan Jensen (University of Victoria)
DTSTART:20210407T123000Z
DTEND:20210407T133000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/7
DESCRIPTION:Title: Wormholes and black hole microstates in AdS/CFT\nby Kristan Je
nsen (University of Victoria) as part of SISSA HEP seminars\n\n\nAbstract\
nIt has long been known that the coarse-grained approximation to the black
hole density of states can be computed using classical Euclidean gravity.
In this talk I will argue for another entry in the dictionary between Euc
lidean gravity and black hole physics\, namely that Euclidean wormholes de
scribe a coarse-grained approximation to the energy level statistics of bl
ack hole microstates. We do so by using the method of constrained instanto
ns to obtain an integral representation of wormhole amplitudes in Einstein
gravity and in full-fledged AdS/CFT. These amplitudes are non-perturbativ
e corrections to the two-boundary problem in AdS quantum gravity. The full
amplitude is likely UV sensitive\, dominated by small wormholes\, but it
admits an integral transformation with a macroscopic\, weakly curved saddl
e-point approximation. The saddle is the "double cone" geometry of Saad\,
Shenker\, and Stanford\, with fixed moduli. In the boundary description th
is saddle appears to dominate a smeared version of the connected two-point
function of the black hole density of states\, and suggests level repulsi
on in the microstate spectrum. I will also discuss the stability of these
wormholes to small fluctuations and to brane nucleation. Our results indic
ate a factorization paradox in AdS/CFT\, and I will discuss a potential me
chanism for understanding it.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Riccardo Rattazzi (EPFL\, Lausanne)
DTSTART:20210421T123000Z
DTEND:20210421T133000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/8
DESCRIPTION:Title: The quantum mechanics of a perfect fluid\nby Riccardo Rattazzi
(EPFL\, Lausanne) as part of SISSA HEP seminars\n\n\nAbstract\nFinite den
sity systems can be described by effective field theories with non-linearl
y realized space-time symmetries\,\nwhose construction resembles that of t
he QCD chiral lagrangian. Also based on that similarity\, one would expect
the \nconstruction to work equally well classically and quantum mechanica
lly. While that is true for superfluids and solids\, \none instead finds t
hat for genuine fluids things are made more complicated by the unusual dyn
amics of their transverse \nmodes\, which are not described by a Fock spa
ce. Focussing on the incompressible limit in 2+1 dimensions\, I illustrate
how a consistent quantum mechanical description of a perfect fluid can be
obtained by using the known equivalence between the area preserving diffe
omorfism group in 2D and $SU(N)$ with $N\\to \\infty$.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gustavo Joaquin Turiaci (UCSB)
DTSTART:20210505T150000Z
DTEND:20210505T160000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/9
DESCRIPTION:Title: The black hole spectrum in (super)gravity\nby Gustavo Joaquin
Turiaci (UCSB) as part of SISSA HEP seminars\n\n\nAbstract\nAbstract: The
talk will focus on the spectrum of near-extremal black holes in gravity an
d near-BPS black holes in supergravity. We will study cases in asymptotica
lly four-dimensional flat space and three-dimensional Anti-de Sitter. This
will be done by analyzing quantum effects near the horizon captured by an
emergent Jackiw-Teitelboim mode at low temperatures. This will allow us t
o systematically study questions such as the extremal degeneracy and the s
ize of the gap in the black hole spectrum\, which can be compared to some
string theory constructions.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Irene Valenzuela (Harvard)
DTSTART:20210519T133000Z
DTEND:20210519T143000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/10
DESCRIPTION:Title: A CFT Distance Conjecture\nby Irene Valenzuela (Harvard) as p
art of SISSA HEP seminars\n\n\nAbstract\nWe formulate a series of conjectu
res relating the geometry of conformal manifolds to the spectrum of local
operators in conformal field theories in d>2 spacetime dimensions. Our cen
tral conjecture is that all theories at infinite distance in the Zamolodch
ikov metric possess an emergent higher-spin symmetry\, generated by an inf
inite tower of currents whose anomalous dimensions vanish exponentially in
the distance. This is sustained by known data collected from the landscap
e of SCFTs\, and yet it suggests a number of intriguing new properties. In
the holographic context our conjectures are related to the Distance Conje
cture in the Swampland program. Interpreted gravitationally\, they imply t
hat approaching infinite distance in moduli space at fixed AdS radius\, a
tower of higher-spin fields becomes massless at an exponential rate that i
s bounded from below in Planck units. This relates to recent developments
of the Distance Conjecture in N=1 4d supergravity theories\, where higher
spin fields also play an essential role as the conjecture seems to follow
from the universal presence of an axionic BPS string at every infinite fie
ld distance limit.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rodolfo Russo (Queen Mary U.)
DTSTART:20210526T123000Z
DTEND:20210526T133000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/11
DESCRIPTION:Title: The Eikonal Approach to Gravitational Scattering and Radiation\nby Rodolfo Russo (Queen Mary U.) as part of SISSA HEP seminars\n\n\nAbs
tract\nAbstract: I will discuss how to use a particle-physics approach to
derive classical observables relevant to gravitational binaries. The tool
used to link quantum and classical observables is the gravitational eikona
l. As an example I will derive the eikonal for massive scalars (i.e. Schwa
rzschild black holes) up to the 3PM approximation and show how to obtain b
oth conservative and radiative observables.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shu-Heng Shao (Institute for Advanced Study)
DTSTART:20210616T140000Z
DTEND:20210616T150000Z
DTSTAMP:20260404T095501Z
UID:SISSAHEP/12
DESCRIPTION:Title: Anomalies and Emergent Symmetries on the Lattice and in the Conti
nuum\nby Shu-Heng Shao (Institute for Advanced Study) as part of SISSA
HEP seminars\n\n\nAbstract\nWe consider various standard and exotic latti
ce models\, and deform them using an approach generalizing the Villain for
mulation. The new lattice models exhibit many properties that were thought
to be exclusive to the continuum field theories. These include exact wind
ing/magnetic symmetries\, anomalies\, and new dualities. We apply this app
roach to the standard XY model\, ZN clock model\, gauge theories\, and exo
tic models related to fractons.\n
LOCATION:https://stable.researchseminars.org/talk/SISSAHEP/12/
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