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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:Discussion Session 4 - Life on the Lattice
DTSTART:20230728T123000Z
DTEND:20230728T133000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-347@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Nathan Seiberg (IAS)\, Anton Kapustin (Caltech)\n\nh
ttps://events.perimeterinstitute.ca/event/29/contributions/347/
LOCATION:VIRTUAL
URL:https://events.perimeterinstitute.ca/event/29/contributions/347/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 4 - A universal pattern at infinite field distance
DTSTART:20230724T154500Z
DTEND:20230724T161500Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-336@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Irene Valenzuela (CERN)\n\nhttps://events.perimeteri
nstitute.ca/event/29/contributions/336/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/336/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 11 - Emanant symmetries
DTSTART:20230725T190000Z
DTEND:20230725T193000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-352@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Nathan Seiberg (Institute for Advanced Study)\n\nhtt
ps://events.perimeterinstitute.ca/event/29/contributions/352/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/352/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 24 - A fake explanation of sub-maximal chaos
DTSTART:20230728T193000Z
DTEND:20230728T200000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-365@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Henry Lin (Stanford University)\n\nhttps://events.pe
rimeterinstitute.ca/event/29/contributions/365/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/365/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 20 - Algebraic ER=EPR
DTSTART:20230727T153000Z
DTEND:20230727T160000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-358@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Netta Engelhardt (Massachusetts Institute of Technol
ogy)\n\nhttps://events.perimeterinstitute.ca/event/29/contributions/358/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/358/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 6 - Soft theorems: symmetry and geometry
DTSTART:20230724T193000Z
DTEND:20230724T200000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-340@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Julio Parra-Martinez (Caltech)\n\nhttps://events.per
imeterinstitute.ca/event/29/contributions/340/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/340/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening Remarks
DTSTART:20230724T140000Z
DTEND:20230724T141500Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-334@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Robert Myers (Perimeter Institute)\n\nhttps://events
.perimeterinstitute.ca/event/29/contributions/334/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/334/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion Session 3 - It from Qubit
DTSTART:20230727T123000Z
DTEND:20230727T133000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-346@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Juan Maldacena (Institute for Advanced Study)\, Geof
f Penington (UC Berkeley)\n\nhttps://events.perimeterinstitute.ca/event/29
/contributions/346/
LOCATION:VIRTUAL
URL:https://events.perimeterinstitute.ca/event/29/contributions/346/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Challenge Talk 3 - Symmetry/Topological-Order correspondence -- fr
om string theory to condensed matter physics
DTSTART:20230726T141500Z
DTEND:20230726T150000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-342@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Xiao-Gang Wen (Massachusetts Institute of Technology
)\n\nhttps://events.perimeterinstitute.ca/event/29/contributions/342/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/342/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 7 - Revisiting logarithmic corrections to supersymme
tric black hole entropy
DTSTART:20230725T150000Z
DTEND:20230725T153000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-348@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Ashoke Sen (Harish-Chandra Research Institute)\n\nht
tps://events.perimeterinstitute.ca/event/29/contributions/348/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/348/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 9 - Black hole cohomologies in N=4 Yang-Mills
DTSTART:20230725T173000Z
DTEND:20230725T180000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-350@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Seok Kim (Seoul National University)\n\nI will expla
in a cohomology problem in the SU(N) maximal super-Yang-Mills theory which
we expect to capture BPS black holes in AdS. I also explain the recent pr
ogress for the SU(2) theory.\n\nhttps://events.perimeterinstitute.ca/event
/29/contributions/350/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/350/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 12 - Non-Invertible Symmetry\, Duality\, and Anomal
ies
DTSTART:20230725T193000Z
DTEND:20230725T200000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-353@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Clay Cordova (University of Chicago)\n\nhttps://even
ts.perimeterinstitute.ca/event/29/contributions/353/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/353/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Challenge Talk 4 - Learning in a quantum world
DTSTART:20230727T141500Z
DTEND:20230727T150000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-343@events.perimeterinstitute.ca
DESCRIPTION:Speakers: John Preskill (Caltech)\n\nAfter reflecting on the f
ruitful connections between quantum information and quantum gravity\, I'll
discuss recent results about using classical and quantum machine learning
to predict the properties of quantum systems.\n\nhttps://events.perimeter
institute.ca/event/29/contributions/343/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/343/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion Session 1 - The Future of the S-matrix
DTSTART:20230725T123000Z
DTEND:20230725T133000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-344@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Simon Caron-Huot (McGill University)\, Sebastian Miz
era (Institute for Advanced Study)\n\nhttps://events.perimeterinstitute.ca
/event/29/contributions/344/
LOCATION:VIRTUAL
URL:https://events.perimeterinstitute.ca/event/29/contributions/344/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion Session 2 - Strings\, QFT\, and Mathematics
DTSTART:20230726T123000Z
DTEND:20230726T133000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-345@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Sakura Schafer-Nameki (University of Oxford)\, Miran
da Cheng (University of Amsterdam)\n\nhttps://events.perimeterinstitute.ca
/event/29/contributions/345/
LOCATION:VIRTUAL
URL:https://events.perimeterinstitute.ca/event/29/contributions/345/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 10 - A tensor model for approximate CFTs
DTSTART:20230725T180000Z
DTEND:20230725T183000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-351@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Daniel Jafferis (Harvard University)\n\nhttps://even
ts.perimeterinstitute.ca/event/29/contributions/351/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/351/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 14 - Irreversibility\, QNEC\, and defects
DTSTART:20230726T153000Z
DTEND:20230726T160000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-355@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Gonzalo Torroba (Centro Atomico Bariloche)\n\nIn thi
s talk we will analyze renormalization group flows on d-dimensional planar
defects\, embedded in a D-dimensional conformal field theory. This genera
l setup includes the case of quantum field theory with no defects ($D=d$)\
, as well as defects of different dimensionality that are of interest in h
igh energy and condensed matter physics. Using methods from quantum inform
ation theory\, we will establish the irreversibility of renormalization gr
oup flows for defect dimensions $d \\le 4$\, and for all $D$. The main ing
redients in the proof are strong subadditivity of the entanglement entropy
\, the Markov property of the conformal vacuum\, and the quantum null ener
gy condition.\n\nhttps://events.perimeterinstitute.ca/event/29/contributio
ns/355/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/355/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Closing Remarks
DTSTART:20230728T200000Z
DTEND:20230728T203000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-826@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Hirosi Ooguri (Caltech)\n\nhttps://events.perimeteri
nstitute.ca/event/29/contributions/826/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/826/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Challenge Talk 1 - The Cosmic Neutrino Background: Its distributio
n on the surface of the Earth and its manipulation on laboratory scales
DTSTART:20230724T174500Z
DTEND:20230724T183000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-333@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Savas Dimopoulos (Stanford University)\n\nhttps://e
vents.perimeterinstitute.ca/event/29/contributions/333/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/333/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 3 - Swampland and a Unification of the Dark Sector
DTSTART:20230724T151500Z
DTEND:20230724T154500Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-335@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Cumrun Vafa (Harvard University)\n\nhttps://events.p
erimeterinstitute.ca/event/29/contributions/335/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/335/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 15 - dS_2 supergravity
DTSTART:20230726T173000Z
DTEND:20230726T180000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-356@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Beatrix Mühlmann (McGill University)\n\nI will disc
uss the interplay between 2d de Sitter and supersymmetry in two concrete s
upergravity models coupled to superconformal field theories. Upon fixing a
supersymmetric analogue of the Weyl gauge these theories can be viewed as
supersymmetric extensions of timelike Liouville theory with N=1 and N=2 s
upersymmetry respectively. Supersymmetric timelike Liouville is well behav
ed in the UV and combines supersymmetry with a positive cosmological const
ant and a de Sitter saddle. The theory is amenable to a variety of techniq
ues including systematic loop expansions and localization methods.\n\nhttp
s://events.perimeterinstitute.ca/event/29/contributions/356/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/356/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 1 - Cosmic ER=EPR
DTSTART:20230724T141500Z
DTEND:20230724T144500Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-337@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Andrew Strominger (Harvard University)\n\nhttps://ev
ents.perimeterinstitute.ca/event/29/contributions/337/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/337/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Challenge Talk 2 - Feynman's Last Blackboard: From Bethe Ansatz to
Langlands Duality
DTSTART:20230725T141500Z
DTEND:20230725T150000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-341@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Edward Frenkel (UC Berkeley)\n\nRichard Feynman's la
st blackboard at Caltech contains a number of tantalizing inscriptions abo
ut Bethe Ansatz in quantum integrable models\, which fascinated him in the
last years of his life. After reviewing some basic examples\, I will pres
ent a modern perspective on the subject\, linking it to dualities in QFT a
nd String Theory\, as well as the Langlands duality in mathematics. I will
then discuss some recent developments that lend support to Feynman's intu
ition that these ideas could be useful in the study of 4d gauge theory\, a
nd formulate some open questions.\n\nhttps://events.perimeterinstitute.ca/
event/29/contributions/341/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/341/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 5 - Crossing beyond scattering amplitudes
DTSTART:20230724T190000Z
DTEND:20230724T193000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-339@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Hofie Hannesdottir (Institute for Advanced Study)\n\
nWhat can be measured asymptotically in quantum field theory? Among the an
swers to this question are scattering amplitudes\, but also a whole compen
dium of inclusive measurements\, such as expectation values of gravitation
al radiation and out-of-time-ordered amplitudes. We show that these asympt
otic observables can be related to one another through new versions of cro
ssing symmetry. Assuming analyticity\, we propose generalized crossing rel
ations and corresponding paths of analytic continuation. Throughout the ta
lk\, we show how to apply crossing in practice\, using various tree- and l
oop-level examples.\n\nhttps://events.perimeterinstitute.ca/event/29/contr
ibutions/339/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/339/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 23 - A holographic dual for Krylov complexity
DTSTART:20230728T190000Z
DTEND:20230728T193000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-364@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Ruth Shir (Luxembourg University)\n\nThere are sever
al suggestions for an appropriate entry for quantum complexity in the holo
graphic duality dictionary. The question is which notion of complexity an
d what is the precise duality. In this talk I endeavor to answer exactly
this question for one\, well studied\, system. Krylov complexity has the
signatures of quantum complexity at all time scales\; it can be defined fo
r operators or states. I will describe some of its features and show that
in the setup of 2-dimensional JT gravity\, Krylov complexity computed on
the boundary has a well defined\, precise geometrical meaning in the bulk.
\n\nhttps://events.perimeterinstitute.ca/event/29/contributions/364/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/364/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 16 - The Hilbert space and holography of information
in de Sitter quantum gravity
DTSTART:20230726T180000Z
DTEND:20230726T183000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-357@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Suvrat Raju (International Centre for Theoretical Sc
iences)\n\nWe obtain all solutions of the Wheeler-DeWitt equation with pos
itive cosmological constant for a closed universe in the large-volume limi
t. We define a natural norm on the solution space and thereby obtain a des
cription of the Hilbert space of quantum gravity in an asymptotically de S
itter spacetime. This provides the finite G_N generalization of the Hilber
t space constructed by Higuchi using group averaging. All the states in th
is Hilbert space share the symmetries of the Euclidean vacuum. We use this
property to generalize the principle of holography of information to de S
itter space: data about cosmological correlators (defined as appropriately
gauge-fixed observables) in an arbitrary small region suffices to specify
them everywhere.\n\nhttps://events.perimeterinstitute.ca/event/29/contrib
utions/357/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/357/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 18 - Bespoke Dual Resonance
DTSTART:20230726T193000Z
DTEND:20230726T200000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-362@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Grant Remmen (Kavli Institute for Theoretical Physic
s)\n\nString amplitudes famously accomplish several extraordinary and inte
rrelated mathematical feats\, including an infinite spin tower\, tame UV b
ehavior\, and dual resonance: the ability of the amplitude to be represent
ed as a sum over a single scattering channel. But how unique are these pro
perties to string amplitudes? In this talk\, I will demonstrate that it is
possible to construct infinite new classes of tree-level\, dual resonant
amplitudes with customizable\, non-Regge mass spectra. Crucial ingredients
are Galois theory and a particular dlog transformation of the Veneziano a
mplitude. The formalism generalizes naturally to n-point scattering and al
lows for a worldsheet-like integral representation. In the case of a Regge
spectrum\, I will investigate whether the structure of the Veneziano ampl
itude can be bootstrapped from first principles. Even there\, we will find
that there is extra freedom in the dynamics\, allowing for a new class of
dual resonant hypergeometric amplitudes with a linear spectrum.\n\nhttps:
//events.perimeterinstitute.ca/event/29/contributions/362/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/362/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 2 - Burns holography
DTSTART:20230724T144500Z
DTEND:20230724T151500Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-338@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Atul Sharma (Harvard University)\n\nI will describe
a complete\, top-down example of celestial holography\, based on recent wo
rk with Costello and Paquette. Our duality relates certain models of self-
dual gauge theory and conformal gravity\, placed on an asymptotically flat
four-dimensional spacetime called Burns space\, to a two-dimensional chir
al algebra living on D1 branes in a topological string theory on twistor s
pace.\n\nhttps://events.perimeterinstitute.ca/event/29/contributions/338/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/338/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 8 - The Virasoro Minimal String
DTSTART:20230725T153000Z
DTEND:20230725T160000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-354@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Lorenz Eberhardt (Institute for Advanced Study)\n\nI
will explain a new 2d gravity/matrix model duality. The bulk theory can b
e defined as a minimal string theory whose matter sector is given by timel
ike Liouville theory instead of a minimal model. The theory admits a dual
description in terms of a double-scaled matrix integral whose leading dens
ity of states is given by the universal Cardy density of states in a 2d CF
T of central charge c\, thus motivating us to call the bulk theory the Vir
asoro minimal string. The duality can be derived by exploiting a certain r
elation to 3d gravity compactified on a circle. For large central charge\,
it reduces to the duality between JT-gravity and the corresponding double
-scaled matrix integral. Based on work in collaboration with Scott Collier
\, Beatrix Mühlmann and Victor Rodriguez.\n\nhttps://events.perimeterinst
itute.ca/event/29/contributions/354/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/354/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 17 - Off Shell Strings and Black Hole Entropy
DTSTART:20230726T190000Z
DTEND:20230726T193000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-361@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Aron Wall (University of Cambridge)\n\nIn order to d
erive the classical string action from the worldsheet\, it is necessary to
take string theory off shell. This can be done by a prescription of Tsey
tlin\, who proposed taking the worldsheet sphere QFT partition function an
d *differentiating* it with the log of the UV cutoff. I will explain why
this strange prescription always gives the correct answers\, for both the
S-matrix and equations of motion\, to all orders in perturbation theory.
I will also compare the Susskind-Uglum off-shell method of calculating bla
ck hole entropy\, to the more popular (but also more dubious) orbifold met
hod. Based on work with Amr Ahmadain (arXiv:2211.08607 and arXiv:2211.164
48).\n\nhttps://events.perimeterinstitute.ca/event/29/contributions/361/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/361/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 22 - Infrared Aspects of QFT and Quantum Gravity: Sc
attering and Coherence
DTSTART:20230728T180000Z
DTEND:20230728T183000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-363@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Gautam Satishchandran (Princeton University)\n\nA lo
ng-standing problem in QFT and quantum gravity is the construction of an
“IR-finite” S-matrix. Infrared divergences in scattering theory are in
timately tied to the “memory effect” and the existence of an infinite
number of “large gauge charges”. A suitable “IR finite” S-matrix r
equires the inclusion of states with memory (which do not lie in the stand
ard Fock space). For QED such a construction was achieved by Faddeev and K
ulish by appropriately “dressing” charged particles with memory. Howev
er\, we show that this construction fails in the case of massless QED\, Ya
ng-Mills theories\, linearized quantum gravity with massless/massive sourc
es\, and in full quantum gravity. In the case of quantum gravity\, we prov
e that the only "Faddeev-Kulish" state is the vacuum state. We also show t
hat non-Faddeev Kulish representations are also unsatisfactory. Thus\, in
general\, it appears there is no preferred Hilbert space for scattering in
QFT and quantum gravity. Nevertheless we show how scattering can be formu
lated in a manner that manifestly IR-finite without any “ad-hoc” restr
ictions or dressing on the states. Finally\, we investigate the consequenc
es of the superselection due to the “large gauge charges” and illustra
te that\, in QED\, nearly all scattering states are completely decohered i
n the bulk.\n\nhttps://events.perimeterinstitute.ca/event/29/contributions
/363/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/363/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 19 - Regge sum rules and stringy amplitudes
DTSTART:20230727T150000Z
DTEND:20230727T153000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-360@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Alexander Zhiboedov (CERN)\n\nhttps://events.perimet
erinstitute.ca/event/29/contributions/360/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/360/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 13 - Six- and eleven-dimensional theories via supers
pace torsion and Poisson brackets
DTSTART:20230726T150000Z
DTEND:20230726T153000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-349@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Ingmar Saberi (University of Heidelberg)\n\nI will r
eview some recent developments that attempt to put modern mathematical too
ls and structural insights to effective use in physics. The focus will be
on two such tools. The first is a perspective on superspace geometry that
leads to powerful structural analogies between twisted theories (which enc
ode the dynamics of particular BPS subsectors) and their untwisted parents
. The second deals with generalizations of typical field theories akin to
the generalization from symplectic to Poisson phase spaces. As an applicat
ion\, one obtains an object with N=(2\,0) superconformal symmetry in six d
imensions. Working at the holomorphic level on flat space\, this object be
comes the current algebra of the exceptional simple superalgebra E(3|6)\,
which localizes to the W_2 algebra and dimensionally reduces to sl(2) supe
r Yang-Mills theory. This is a mixture of joint work with numerous collabo
rators\, in particular Hahner\, Raghavendran\, and Williams.\n\nhttps://ev
ents.perimeterinstitute.ca/event/29/contributions/349/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/349/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk 21 - A Background Independent Algebra for Quantum Gr
avity?
DTSTART:20230728T173000Z
DTEND:20230728T180000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-359@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Edward Witten (Institute for Advanced Study)\n\nTo d
efine an algebra of observables in quantum gravity in a way that is univer
sal and does not depend on a background spacetime\, one can consider the o
bservables along the worldline of an observer\, rather than the observable
s in a region of spacetime.\n\nhttps://events.perimeterinstitute.ca/event/
29/contributions/359/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/359/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Town Hall
DTSTART:20230727T170000Z
DTEND:20230727T183000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-827@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Rajesh Gopakumar (ICTS)\, Cynthia Keeler (ASU)\n\nSt
rings Planning Committee Proposal (60 minutes) and Revised Postdoc Accord
Proposal (30 minutes)\n\nhttps://events.perimeterinstitute.ca/event/29/con
tributions/827/
LOCATION:VIRTUAL
URL:https://events.perimeterinstitute.ca/event/29/contributions/827/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Public Talk - The meaning of spacetime: Black holes\, wormholes an
d quantum entanglement
DTSTART:20230727T230000Z
DTEND:20230728T000000Z
DTSTAMP:20230922T223900Z
UID:indico-contribution-829@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Juan Maldacena (IAS)\n\nAccording to Einstein's theo
ry of gravity\, spacetime is curved and dynamical. The theory had two surp
rising predictions\, black holes and the expansion of the universe. In bot
h cases there are regions of spacetime that are outside the reach of the c
lassical theory\, the so called ``singularities''. In order to treat them
\, we need a quantum mechanical description of spacetime. We will describe
some ideas that arose from the study of quantum aspects of black holes. T
hey involve an interesting connection between the basic quantum mechanical
description and the geometry of spacetime. We will describe how wormholes
are related to quantum entanglement.\n\nhttps://events.perimeterinstitute
.ca/event/29/contributions/829/
LOCATION:PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)
URL:https://events.perimeterinstitute.ca/event/29/contributions/829/
END:VEVENT
END:VCALENDAR