Perturbative gravity at null infinity

Tim Adamo, Eduardo Casali, David B. Skinner

Type: Article

Publication Date: 2014-11-04

Citations: 114

DOI: https://doi.org/10.1088/0264-9381/31/22/225008

Abstract

We describe a theory that lives on the null conformal boundary of asymptotically flat space-time, and whose states encode the radiative modes of (super)gravity. We study the induced action of the BMS group, verifying that the Ward identity for certain BMS supertranslations is equivalent to Weinberg's soft graviton theorem in the bulk. The subleading behaviour of soft gravitons may also be obtained from a Ward identity for certain superrotation generators in the extended BMS algebra proposed by Barnich and Troessaert. We show that the theory computes the complete classical gravitational S-matrix, perturbatively around the Minkowski vacuum.

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Classical and Quantum Gravity - View
arXiv (Cornell University) - View - PDF
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