科研之友
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摘要
The asymptotic symmetry group (ASG) at future null infinity (I+) of asymptotically 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+.
- 出版日期2011-9-7
