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BEGIN:VEVENT
SUMMARY:Gerardus 't Hooft (Utrecht University)
DTSTART:20210415T150000Z
DTEND:20210415T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/1
DESCRIPTION:Title: Horizons at a quantised black hole\nby Gerardus 't Hooft (Utrec
ht University) as part of Quantum Gravity and All of That\n\nAbstract: TBA
\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Netta Engelhardt (MIT)
DTSTART:20210429T150000Z
DTEND:20210429T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/2
DESCRIPTION:Title: Simplicity in the Black Hole Interior\nby Netta Engelhardt (MIT
) as part of Quantum Gravity and All of That\n\n\nAbstract\nIt has often b
een speculated that the black hole interior in holography has high computa
tional complexity in the dual CFT. I will argue that operators in the blac
k hole interior are simple whenever they lie outside of the outermost (qua
ntum) extremal surface. That is\, that non-minimal quantum extremal surfac
es are the only source of high complexity in AdS/CFT. This is the converse
of the so-called Python's lunch conjecture\, which proposes that operator
s with support behind the outermost quantum extremal surface - e.g. Hawkin
g partners - are highly complex.\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roger Penrose (Oxford University)
DTSTART:20210513T150000Z
DTEND:20210513T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/3
DESCRIPTION:Title: Why Resolving the Singularity Problem of General Relativity is Not
Just a Quantum Gravity Issue\nby Roger Penrose (Oxford University) as
part of Quantum Gravity and All of That\n\n\nAbstract\nOver many years\, t
here has been much impressive theorizing about how quantum mechanics might
modify the space-time structure of general relativity at extremely tiny s
cales. A good deal of this work has been aimed at resolving the space-time
singularity problem. However\, there are strong reasons for believing tha
t this cannot provide an overall resolution of that problem\, the big bang
having a totally different structure from the expected singularities in b
lack holes.\n\nConformal geometry provides a very different outlook\, reve
aling issues deeply related to the 2nd law of thermodynamics and leading t
o an exotic cosmological picture (conformal cyclic cosmology\, or CCC)\, w
ith various predictions\, some now confirmed in observations of previously
unexpected effects—most particularly those referred to as “Hawking po
ints”.\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Geoffrey Penington (Berkeley University)
DTSTART:20210527T150000Z
DTEND:20210527T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/4
DESCRIPTION:Title: Finding Pythons in Unexpected Places\nby Geoffrey Penington (Be
rkeley University) as part of Quantum Gravity and All of That\n\n\nAbstrac
t\nWe argue that novel (highly nonclassical) quantum extremal surfaces pla
y a crucial role in reconstructing the black hole interior even for isolat
ed\, single-sided\, non-evaporating black holes (i.e. with\nno auxiliary r
eservoir). Specifically\, any code subspace where interior\noutgoing modes
can be excited will have a quantum extremal surface in\nits maximally mix
ed state. We argue that as a result\, reconstruction of\ninterior outgoing
modes is always exponentially complex. Our\nconstruction provides evidenc
e in favor of a strong Python's lunch\nproposal: that nonminimal quantum e
xtremal surfaces are the exclusive\nsource of exponential complexity in th
e holographic dictionary. We also\ncomment on the relevance of these quant
um extremal surfaces to the\ngeometrization of state dependence in the typ
icality arguments for\nfirewalls.\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Mertens (Ghent University)
DTSTART:20210610T150000Z
DTEND:20210610T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/5
DESCRIPTION:Title: Bulk observables in Jackiw-Teitelboim gravity\nby Thomas Merten
s (Ghent University) as part of Quantum Gravity and All of That\n\n\nAbstr
act\nUsing a definition of bulk diff-invariant observables\, we go into th
e bulk of 2d Jackiw-Teitelboim gravity. By mapping the computation to a Sc
hwarzian path integral\, we study exact bulk correlation functions and dis
cuss their physical implications. We describe how the black hole thermal a
tmosphere gets modified by quantum gravitational corrections. Finally\, we
will discuss how higher topological effects further modify the spectral d
ensity and detector response in the Unruh heat bath.\nBased on arXiv:1902.
11194\, 1903.10485\, 2005.13058 and work in progress.\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Samir Mathur (Ohio State University)
DTSTART:20210617T150000Z
DTEND:20210617T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/6
DESCRIPTION:Title: Contrasting the fuzzball and wormhole paradigms\nby Samir Mathu
r (Ohio State University) as part of Quantum Gravity and All of That\n\nAb
stract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:James Gates (Brown University)
DTSTART:20210708T150000Z
DTEND:20210708T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/7
DESCRIPTION:Title: Effective Methods For Component Field Transparency For Arbitrary Su
perfields\nby James Gates (Brown University) as part of Quantum Gravit
y and All of That\n\n\nAbstract\nIn 1974 Salam and Strathdee introduced me
thods based superspace\nwhich facilitated the construction of arbitrary re
presentations of\nspacetime supersymmetry. While this approach allows for
the derivation\nof component field results for low dimensions\, it become
s remarkably\nopaque for higher dimensional superfields. To overcome this
disability\,\nrecently there has been introduced new methods based on 'ad
ynkra'\nnetworks\, Dynkin Label/Young Tableaux\, Plethysm\, and IT algorit
hms.\nDetails of this approach are illustrated in the case of ten and elev
en\ndimensional theories.\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Steve Giddings (UCSB)
DTSTART:20210902T150000Z
DTEND:20210902T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/10
DESCRIPTION:by Steve Giddings (UCSB) as part of Quantum Gravity and All of
That\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gia Dvali (Munich\, Max Planck Institute & Munich U.\, ASC)
DTSTART:20210916T150000Z
DTEND:20210916T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/11
DESCRIPTION:Title: Towards demystification of black holes\nby Gia Dvali (Munich\,
Max Planck Institute & Munich U.\, ASC) as part of Quantum Gravity and Al
l of That\n\n\nAbstract\nFor a long time\, certain well-known properties o
f Black holes\, such as the area form of the entropy as well as a long tim
e-scale of information retrieval\, have been considered to be mysteries. W
e explain that black holes turn out not to be exceptional in this respect.
Instead\, the above seemingly-mysterious properties follow from certain u
niversal bounds on information storage and retrieval. They are imposed by
unitarity and are fully non-perturbative. The objects that saturate these
consistency bounds exhibit the properties identical to black holes. A long
list of examples includes saturated solitons\, instantons and baryons in
renormalizable field theories. Perhaps the most striking example is the co
lor glass condensate in ordinary QCD. We predict new observable phenomena
for such objects\, including black holes. We focus on the phenomenon of th
e ``memory burden"\, the essence of which is that the information pattern
stored by the system back-reacts and resists decay. For black holes\, this
predicts a dramatic deviation from usually assumed evolution\, and has po
tentially important implications for primordial black holes as dark matter
candidates.\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/11/
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BEGIN:VEVENT
SUMMARY:Leonard Susskind (Stanford University)
DTSTART:20211014T150000Z
DTEND:20211014T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/12
DESCRIPTION:Title: de Sitter Holography\nby Leonard Susskind (Stanford University
) as part of Quantum Gravity and All of That\n\n\nAbstract\nI will discuss
aspects of de Sitter holography\, possibly including Matrix theory\, enta
nglement\, and chaos.\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robert Brandenberger (McGill University)
DTSTART:20211028T150000Z
DTEND:20211028T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/13
DESCRIPTION:Title: Nonsingular Cosmologies and Black Holes with S-Branes\nby Robe
rt Brandenberger (McGill University) as part of Quantum Gravity and All of
That\n\n\nAbstract\nS-Branes are objects motivated by superstring theory
which appear in a low energy effective action for our four dimensional spa
ce-time. I will demonstrate how such branes can be used to obtain nonsingu
lar cosmologies (specifically\, a nonsingular realization of the Ekpyrotic
scenario) and nonsingular black holes.\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gabriele Veneziano (CERN\, Collège de France)
DTSTART:20211104T160000Z
DTEND:20211104T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/14
DESCRIPTION:Title: From Newtonian to ultra-relativistic gravitational scattering at 3
rd post-Minkowskian order\nby Gabriele Veneziano (CERN\, Collège de F
rance) as part of Quantum Gravity and All of That\n\n\nAbstract\nUsing the
eikonal approximation for quantum scattering I will argue that the non-re
lativistic (Newtonian) and ultra-relativistic (massless) limits of classic
al gravitational scattering are smoothly connected at 3rd post-Minkowskian
(3PM) order provided radiation reaction effects are properly taken into a
ccount. This is how a two-year-old puzzle raised by the first 3PM result b
y Bern et al. was solved about a year ago. Extending the connection to the
next PM order looks both important and non-trivial.\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Slava Mukhanov (Munich University\, ASC)
DTSTART:20211118T160000Z
DTEND:20211118T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/15
DESCRIPTION:by Slava Mukhanov (Munich University\, ASC) as part of Quantum
Gravity and All of That\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elias Kiritsis (Université de Paris\; University of Crete)
DTSTART:20211125T160000Z
DTEND:20211125T170000Z
DTSTAMP:20260404T095717Z
UID:QGHOLQI/16
DESCRIPTION:by Elias Kiritsis (Université de Paris\; University of Crete)
as part of Quantum Gravity and All of That\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QGHOLQI/16/
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