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UID:60@gravity.physik.fau.de
DTSTART;TZID=Europe/Berlin:20230503T160000
DTEND;TZID=Europe/Berlin:20230503T170000
DTSTAMP:20230422T082731Z
URL:https://www.gravity.physik.fau.de/events/complex-critical-point-and-ef
 fective-dynamics-of-spinfoam-quantum-gravity-dongxue-qu-perimeter-institut
 e-fau2-talk/
SUMMARY:Complex critical point and effective dynamics of spinfoam quantum g
 ravity (Dongxue Qu\, Perimeter Institute) FAU^2 Talk
DESCRIPTION:This talk will be based on the paper arXiv:2301.02930. I will i
 ntroduce the complex critical points in the 4-dimensional Lorentzian Engle
 -Pereira-Rovelli-Livine (EPRL) spinfoam model in the large-𝑗 regime. Fo
 r the 4-simplex amplitude\, taking into account the complex critical point
  generalizes the large-𝑗 asymptotics to the situation with non-Regge bo
 undary data and relates to the twisted geometry. For generic simplicial co
 mplexes\, I will present a general procedure to derive the effective theor
 y of Regge geometries from the spinfoam amplitude in the large-𝑗 regime
  by using the complex critical points. The effective theory is analyzed in
  detail for the spinfoam amplitude on the double-Δ3 simplicial complex.
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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