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BEGIN:VEVENT
SUMMARY:Philipp Höhn (OIST\, University College London)
DTSTART:20201007T150000Z
DTEND:20201007T160000Z
DTSTAMP:20260422T225841Z
UID:QG-AA/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QG-AA/1/">Pr
 oblem of time\, relational observables and quantum covariance</a>\nby Phil
 ipp Höhn (OIST\, University College London) as part of Quantum Gravity Ac
 ross Approaches\n\n\nAbstract\nThe diffeomorphism symmetry of general rela
 tivity leads to the infamous problem of time\, haunting especially canonic
 al approaches to quantum gravity. The core question it raises is how to de
 fine quantum dynamics in a diffeomorphism-invariant context (in the absenc
 e of external references such as boundaries) and is intimately tied with t
 he more general question of what are observables in a background-independe
 nt quantum theory. Relational observables are one way of addressing these 
 challenges. The underlying idea is to localize physical quantities of inte
 rest relative to other dynamical degrees of freedom\, chosen as a dynamica
 l reference system\, rather than a spacetime background. A comprehensive r
 elational picture then warrants covariance to be extended to changes of dy
 namical reference system. In this talk\, I will offer an overview over ach
 ievements and challenges of the relational approach\, as well as perspecti
 ves on quantum gravity arising therefrom.\n
LOCATION:https://researchseminars.org/talk/QG-AA/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:William Donnelly (Perimeter Institute)
DTSTART:20201102T170000Z
DTEND:20201102T180000Z
DTSTAMP:20260422T225841Z
UID:QG-AA/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QG-AA/2/">Dr
 essed observables in perturbative quantum gravity</a>\nby William Donnelly
  (Perimeter Institute) as part of Quantum Gravity Across Approaches\n\nAbs
 tract: TBA\n
LOCATION:https://researchseminars.org/talk/QG-AA/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Harlow (MIT)
DTSTART:20201202T170000Z
DTEND:20201202T183000Z
DTSTAMP:20260422T225841Z
UID:QG-AA/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QG-AA/3/">Gl
 obal symmetry\, Euclidean gravity\, and the black hole information problem
 </a>\nby Daniel Harlow (MIT) as part of Quantum Gravity Across Approaches\
 n\n\nAbstract\nIn this talk I will show how the essential ingredients of r
 ecent calculations of the Page curve of an evaporating black hole can be u
 sed to generalize a recent argument against global symmetries beyond the A
 dS/CFT correspondence to more realistic theories of quantum gravity\, illu
 strating a close connection between the absence of global symmetries and a
  unitary resolution of the black hole information problem. I'll also give 
 several low-dimensional examples of quantum gravity theories which do not 
 have a unitary resolution of the black hole information problem\, and whic
 h therefore can and do have global symmetries. Motivated by this discussio
 n\, I'll conjecture that in a certain sense Euclidean quantum gravity is e
 quivalent to holography.  Based on recent work with Edgar Shaghoulian.\n
LOCATION:https://researchseminars.org/talk/QG-AA/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kasia Rejzner
DTSTART:20210118T170000Z
DTEND:20210118T183000Z
DTSTAMP:20260422T225841Z
UID:QG-AA/4
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QG-AA/4/">No
 n-local observables in quantum gravity from the algebraic QFT perspective<
 /a>\nby Kasia Rejzner as part of Quantum Gravity Across Approaches\n\nAbst
 ract: TBA\n
LOCATION:https://researchseminars.org/talk/QG-AA/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renate Loll
DTSTART:20210217T170000Z
DTEND:20210217T183000Z
DTSTAMP:20260422T225841Z
UID:QG-AA/5
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QG-AA/5/">Ob
 servables for Quantum Gravity: Going Nonperturbative</a>\nby Renate Loll a
 s part of Quantum Gravity Across Approaches\n\n\nAbstract\nThe physical na
 ture and explicit construction of observables in quantum gravity depend on
  length scale and context\, and tend to be very different in perturbative 
 and nonperturbative regimes. My talk will focus on the latter\, which is c
 haracterised by the absence of a pre-existing background and where spaceti
 me is not described by a smooth metric tensor. What constitutes appropriat
 e (pre-)gravitational observables near the Planck scale is not known a pri
 ori\, and their operational definition depends on how diffeomorphism symme
 try is implemented nonperturbatively. Natural candidates are "quantum gene
 ralisations" of nonlocal classical observables\, which in general will nee
 d to be renormalized and may display unexpected\, anomalous behaviour. To 
 compare with classical results\, one also needs some control on how to coa
 rse-grain. The construction and implementation of nonperturbative quantum 
 observables poses creative and technical challenges that can be addressed 
 successfully in sufficiently complete candidate theories\, as I will illus
 trate in the context of Causal Dynamical Triangulations.\n
LOCATION:https://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:20260422T225841Z
UID:QG-AA/6
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QG-AA/6/">Ob
 servables in Quantum Gravity: Panel Discussion</a>\nby Philipp Hohn\, Will
 iam Donnelly\, Daniel Harlow\, Kasia Rejzner\, Renate Loll as part of Quan
 tum Gravity Across Approaches\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/QG-AA/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Mattingly (University of New Hampshire)
DTSTART:20210928T130000Z
DTEND:20210928T143000Z
DTSTAMP:20260422T225841Z
UID:QG-AA/7
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QG-AA/7/">Su
 rveying the foggy landscape of quantum gravity phenomenology</a>\nby David
  Mattingly (University of New Hampshire) as part of Quantum Gravity Across
  Approaches\n\n\nAbstract\nQuantum gravity phenomenology incorporates a tr
 emendous spread of experimental approaches - from kilometer scale astrophy
 sical laboratories sensitive to classical imprints of Planck scale quantum
  spacetime to micron sized mechanical systems aiming to prove the quantum 
 nature of weak field general relativity. The proliferation of dramatically
  different techniques is due to two related difficulties: there is no sing
 le current experimental approach that can directly probe the quantum gravi
 tational regime and there are numerous theoretical quantum gravity models 
 that give different subtle modifications to low energy physics.  In this t
 alk I give a survey of various phenomenological approaches\, relating each
  to the underlying relevant theoretical frameworks\, and detail how each a
 pproach says _something_ about quantum gravity\, although none can give us
  a direct picture.\n
LOCATION:https://researchseminars.org/talk/QG-AA/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Markus Aspelmeyer and Sougato Bose
DTSTART:20211022T150000Z
DTEND:20211022T163000Z
DTSTAMP:20260422T225841Z
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://researchseminars.org/talk/QG-AA/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giulia Gubitosi and Nikolaos Mavromatos
DTSTART:20211119T170000Z
DTEND:20211119T183000Z
DTSTAMP:20260422T225841Z
UID:QG-AA/9
DESCRIPTION:by Giulia Gubitosi and Nikolaos Mavromatos as part of Quantum 
 Gravity Across Approaches\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/QG-AA/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scott Melville and Irene Valenzuela
DTSTART:20220118T160000Z
DTEND:20220118T173000Z
DTSTAMP:20260422T225841Z
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://researchseminars.org/talk/QG-AA/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sachiko Kuroyanagi
DTSTART:20220224T160000Z
DTEND:20220224T173000Z
DTSTAMP:20260422T225841Z
UID:QG-AA/12
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QG-AA/12/">S
 tochastic gravitational wave background in quantum gravity</a>\nby Sachiko
  Kuroyanagi as part of Quantum Gravity Across Approaches\n\nAbstract: TBA\
 n
LOCATION:https://researchseminars.org/talk/QG-AA/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kostas Skenderis and Edward Wilson-Ewing
DTSTART:20220420T150000Z
DTEND:20220420T163000Z
DTSTAMP:20260422T225841Z
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://researchseminars.org/talk/QG-AA/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Steve Giddings and Hal Haggard
DTSTART:20220526T160000Z
DTEND:20220526T173000Z
DTSTAMP:20260422T225841Z
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://researchseminars.org/talk/QG-AA/14/
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