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UID:57@gravity.physik.fau.de
DTSTART;TZID=Europe/Berlin:20230502T151500
DTEND;TZID=Europe/Berlin:20230502T161500
DTSTAMP:20230422T082329Z
URL:https://www.gravity.physik.fau.de/events/edge-modes-and-quantum-refere
 nce-frames-in-linearized-gravity-wolfgang-wieland-fau-fau2-talk/
SUMMARY:Edge modes and quantum reference frames in linearized gravity (Wolf
 gang Wieland\, FAU) FAU^2 Talk
DESCRIPTION:A common way to interpret the coordinate invariance of Einstein
 ’s equations is to say that coordinates are a mere gauge redundancy and 
 play no physical role themselves. This is no longer true when we restrict 
 ourselves to subsystems localized in a compact but otherwise arbitrary dom
 ain. At the boundary of the domain\, coordinate transformations are no lon
 ger gauge redundant. The then necessary boundary conditions brake the gaug
 e symmetries of the theory in the bulk. Otherwise unphysical gauge redunda
 ncies take on physical meaning as physical boundary modes (edge modes). In
  my talk\, I present two recent developments on this frontier. First of al
 l\, I will speak about how to connect the research on edge modes to the ge
 ometry of open systems\, dissipation and entropy production via the framew
 ork of metriplectic geometry. The second part of the talk deals with pertu
 rbative gravity. Taking a decoupling limit\, where the Newton constant is 
 sent to zero\, we characterize the local phase space of the gravitational 
 field in a finite region. Phase space splits into radiation modes and addi
 tional edge modes that are dual to reference frames at the boundary. Takin
 g the boundary to infinity\, we obtain a new quantum representation of asy
 mptotic symmetries in perturbative gravity. The resulting infinite-dimensi
 onal group of boundary symmetries is the group of asymptotic Bondi–Metzn
 er–Sachs (BMS) transformations at spacelike infinity. In this way\, our 
 results extend the existing notions of quantum reference frames and make t
 hem applicable to the framework of asymptotic symmetries and weak fields.\
 nThe talk is based on [arXiv:2206.00029] and [arXiv:2302.11629].
CATEGORIES:Group Seminar
LOCATION:ECAP Lab Building ground floor 00.061\, Nikolaus-Fiebiger-Str. 2\,
  Erlangen \, 91058\, Germany
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Nikolaus-Fiebiger-Str. 2\, 
 Erlangen \, 91058\, Germany;X-APPLE-RADIUS=100;X-TITLE=ECAP Lab Building g
 round floor 00.061:geo:0,0
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TZID:Europe/Berlin
X-LIC-LOCATION:Europe/Berlin
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DTSTART:20230326T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
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