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BEGIN:VEVENT
SUMMARY:Philipp Höhn (OIST\, University College London)
DTSTART:20201007T150000Z
DTEND:20201007T160000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/1
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/QG-AA
 /1/">Problem of time\, relational observables and quantum covariance</a>\n
 by Philipp Höhn (OIST\, University College London) as part of Quantum Gra
 vity Across Approaches\n\n\nAbstract\nThe diffeomorphism symmetry of gener
 al relativity leads to the infamous problem of time\, haunting especially 
 canonical approaches to quantum gravity. The core question it raises is ho
 w to define quantum dynamics in a diffeomorphism-invariant context (in the
  absence of external references such as boundaries) and is intimately tied
  with the more general question of what are observables in a background-in
 dependent quantum theory. Relational observables are one way of addressing
  these challenges. The underlying idea is to localize physical quantities 
 of interest relative to other dynamical degrees of freedom\, chosen as a d
 ynamical reference system\, rather than a spacetime background. A comprehe
 nsive relational picture then warrants covariance to be extended to change
 s of dynamical reference system. In this talk\, I will offer an overview o
 ver achievements and challenges of the relational approach\, as well as pe
 rspectives on quantum gravity arising therefrom.\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:William Donnelly (Perimeter Institute)
DTSTART:20201102T170000Z
DTEND:20201102T180000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/2
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/QG-AA
 /2/">Dressed observables in perturbative quantum gravity</a>\nby William D
 onnelly (Perimeter Institute) as part of Quantum Gravity Across Approaches
 \n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Harlow (MIT)
DTSTART:20201202T170000Z
DTEND:20201202T183000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/3
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/QG-AA
 /3/">Global symmetry\, Euclidean gravity\, and the black hole information 
 problem</a>\nby Daniel Harlow (MIT) as part of Quantum Gravity Across Appr
 oaches\n\n\nAbstract\nIn this talk I will show how the essential ingredien
 ts of recent calculations of the Page curve of an evaporating black hole c
 an be used to generalize a recent argument against global symmetries beyon
 d the AdS/CFT correspondence to more realistic theories of quantum gravity
 \, illustrating a close connection between the absence of global symmetrie
 s and a unitary resolution of the black hole information problem. I'll als
 o give several low-dimensional examples of quantum gravity theories which 
 do not have a unitary resolution of the black hole information problem\, a
 nd which therefore can and do have global symmetries. Motivated by this di
 scussion\, I'll conjecture that in a certain sense Euclidean quantum gravi
 ty is equivalent to holography.  Based on recent work with Edgar Shaghouli
 an.\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kasia Rejzner
DTSTART:20210118T170000Z
DTEND:20210118T183000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/4
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/QG-AA
 /4/">Non-local observables in quantum gravity from the algebraic QFT persp
 ective</a>\nby Kasia Rejzner as part of Quantum Gravity Across Approaches\
 n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renate Loll
DTSTART:20210217T170000Z
DTEND:20210217T183000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/5
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/QG-AA
 /5/">Observables for Quantum Gravity: Going Nonperturbative</a>\nby Renate
  Loll as part of Quantum Gravity Across Approaches\n\n\nAbstract\nThe phys
 ical nature and explicit construction of observables in quantum gravity de
 pend on length scale and context\, and tend to be very different in pertur
 bative and nonperturbative regimes. My talk will focus on the latter\, whi
 ch is characterised by the absence of a pre-existing background and where 
 spacetime is not described by a smooth metric tensor. What constitutes app
 ropriate (pre-)gravitational observables near the Planck scale is not know
 n a priori\, and their operational definition depends on how diffeomorphis
 m symmetry is implemented nonperturbatively. Natural candidates are "quant
 um generalisations" of nonlocal classical observables\, which in general w
 ill need to be renormalized and may display unexpected\, anomalous behavio
 ur. To compare with classical results\, one also needs some control on how
  to coarse-grain. The construction and implementation of nonperturbative q
 uantum observables poses creative and technical challenges that can be add
 ressed successfully in sufficiently complete candidate theories\, as I wil
 l illustrate in the context of Causal Dynamical Triangulations.\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Philipp Hohn\, William Donnelly\, Daniel Harlow\, Kasia Rejzner\, 
 Renate Loll
DTSTART:20210408T130000Z
DTEND:20210408T143000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/6
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/QG-AA
 /6/">Observables in Quantum Gravity: Panel Discussion</a>\nby Philipp Hohn
 \, William Donnelly\, Daniel Harlow\, Kasia Rejzner\, Renate Loll as part 
 of Quantum Gravity Across Approaches\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Mattingly (University of New Hampshire)
DTSTART:20210928T130000Z
DTEND:20210928T143000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/7
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/QG-AA
 /7/">Surveying the foggy landscape of quantum gravity phenomenology</a>\nb
 y David Mattingly (University of New Hampshire) as part of Quantum Gravity
  Across Approaches\n\n\nAbstract\nQuantum gravity phenomenology incorporat
 es a tremendous spread of experimental approaches - from kilometer scale a
 strophysical laboratories sensitive to classical imprints of Planck scale 
 quantum spacetime to micron sized mechanical systems aiming to prove the q
 uantum nature of weak field general relativity. The proliferation of drama
 tically different techniques is due to two related difficulties: there is 
 no single current experimental approach that can directly probe the quantu
 m gravitational regime and there are numerous theoretical quantum gravity 
 models that give different subtle modifications to low energy physics.  In
  this talk I give a survey of various phenomenological approaches\, relati
 ng each to the underlying relevant theoretical frameworks\, and detail how
  each approach says _something_ about quantum gravity\, although none can 
 give us a direct picture.\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Markus Aspelmeyer and Sougato Bose
DTSTART:20211022T150000Z
DTEND:20211022T163000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/8
DESCRIPTION:by Markus Aspelmeyer and Sougato Bose as part of Quantum Gravi
 ty Across Approaches\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giulia Gubitosi and Nikolaos Mavromatos
DTSTART:20211119T170000Z
DTEND:20211119T183000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/9
DESCRIPTION:by Giulia Gubitosi and Nikolaos Mavromatos as part of Quantum 
 Gravity Across Approaches\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scott Melville and Irene Valenzuela
DTSTART:20220118T160000Z
DTEND:20220118T173000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/10
DESCRIPTION:by Scott Melville and Irene Valenzuela as part of Quantum Grav
 ity Across Approaches\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sachiko Kuroyanagi
DTSTART:20220224T160000Z
DTEND:20220224T173000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/12
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/QG-AA
 /12/">Stochastic gravitational wave background in quantum gravity</a>\nby 
 Sachiko Kuroyanagi as part of Quantum Gravity Across Approaches\n\nAbstrac
 t: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kostas Skenderis and Edward Wilson-Ewing
DTSTART:20220420T150000Z
DTEND:20220420T163000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/13
DESCRIPTION:by Kostas Skenderis and Edward Wilson-Ewing as part of Quantum
  Gravity Across Approaches\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Steve Giddings and Hal Haggard
DTSTART:20220526T160000Z
DTEND:20220526T173000Z
DTSTAMP:20260404T111324Z
UID:QG-AA/14
DESCRIPTION:by Steve Giddings and Hal Haggard as part of Quantum Gravity A
 cross Approaches\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/QG-AA/14/
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