Asymptotic Symmetries and Charges in De Sitter Space
Dionysios Anninos, Gim Seng Ng, Andrew Strominger
TL;DR
This paper defines the asymptotic symmetry group at future null infinity in de Sitter space, constructs associated charges, and derives a conservation law linking charge evolution to radiation flux.
Contribution
It introduces a new framework for understanding asymptotic symmetries and charges in de Sitter space, extending previous concepts from other spacetimes.
Findings
ASG at I^+ is the group of 3D diffeomorphisms
Finite charges are constructed for each ASG generator
A conservation equation relates charge evolution to radiation flux
Abstract
The asymptotic symmetry group (ASG) at future null infinity (I^+) of four-dimensional de Sitter spacetimes is defined and shown to be given by the group of three-dimensional diffeomorphisms acting on I^+. Finite charges are constructed for each choice of ASG generator together with a two-surface on I^+. A conservation equation is derived relating the evolution of the charges with the radiation flux through I^+.
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