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SUMMARY:De Sitter space as coherent state of gravitons
DTSTART:20230501T140000
DTEND:20230501T150000
DTSTAMP:20260507T065453Z
UID:61794e2b174755978dccd760765ad6c945b4c19d2604b5998fa040ff
CATEGORIES:Conferences - Seminars
DESCRIPTION:Otari Sakhelashvili (Sydney University)\nAbstract:\n\nNot a lo
 ng ago\, it was argued that the quantum gravity only tolerates de Sitter a
 s a state on top of a valid vacuum. So\, we construct the de sitter state 
 as a coherent state of gravitons on top of the Minkowski vacuum. To make t
 he construction consistent\, we use BRST quantization. As an example\, fir
 st we study such construction in QED\, and then we generalize it in linear
  gravity. Coupling the gravity with a large number of soft scalars gives u
 s the possibility to take double-scale\, so-called species limit\, in whic
 h gravity linearize and the construction is exact. In this theory\, only c
 ollective quantum phenomena\, like Gibbons-Hawking radiation\, survive. We
  also double-check consistency of our construction using the above process
 es.\n\nThe talk is based on: Berezhiani\, Dvali\, Sakhelashvili\, Phys. R
 ev. D 105\, 025022\n\n 
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727
STATUS:CONFIRMED
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