Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series SEM-CPHT
Subjects hep-th
Date Tuesday 25 June 2019
Time 11:00
Institute CPHT
Seminar Room Salle Louis Michel
Speaker's Last Name Ruzziconi
Speaker's First Name Romain
Speaker's Email Address
Speaker's Institution University ULB Brussels
Title The \Lambda-BMS4 group of dS4 and new boundary conditions for AdS4
Abstract In this talk, I will discuss the solution space of general relativity in Bondi gauge, with non-vanishing cosmological constant. Using the dictionary between Bondi and Fefferman-Graham gauges, the analogues of the Bondi news, Bondi mass and Bondi angular momentum aspects at the boundary of generic asymptotically locally dS4 spacetimes will be identified. Then, I will introduce the \Lambda-BMS4 group as the residual symmetry group of Bondi gauge after boundary gauge fixing. This group consists in infinite dimensional non-abelian supertranslations and superrotations and it reduces in the asymptotically flat limit to the extended BMS4 group. Furthermore, I will present new boundary conditions for asymptotically locally AdS4 spacetimes which admit R times the group of area-preserving diffeomorphisms as the asymptotic symmetry group.
arXiv Preprint Number 1905.00971
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