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SUMMARY:Geoffrey Compère (Brussels U. and Intl. Solvay Inst.\, Brussels)
DTSTART:20240326T100000Z
DTEND:20240326T110000Z
DTSTAMP:20260423T024826Z
UID:NKUA-HEP/14
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/NKUA-HEP/14/
 ">Memory effects in de Sitter and the Lambda-BMS group</a>\nby Geoffrey Co
 mpère (Brussels U. and Intl. Solvay Inst.\, Brussels) as part of NKUA HEP
  Seminars\n\n\nAbstract\nI will first review the features of the displacem
 ent memory effect in asymptotically flat spacetimes. I will contrast the a
 symptotic structure of future infinity in de Sitter spacetime to the one o
 f null infinity in asymptotically flat spacetimes and explain how a genera
 lization of the BMS group of asymptotic symmetries\, the Lambda-BMS group\
 , arises in de Sitter. I will then explain how to solve for the linear gra
 viton field in de Sitter for a localized quadrupolar source and derive the
  de Sitter memory effect and its relationship to the Lambda-BMS group. I w
 ill prove that the analysis invalidates the dS4/CFT3 conjecture.\n
LOCATION:https://researchseminars.org/talk/NKUA-HEP/14/
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