Perturbative gravity at null infinity

Timothy Adamo, Eduardo Casali, David Skinner

Research output: Contribution to journalArticlepeer-review


We describe a theory that lives on the null conformal boundary ℐ 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
ʼs 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 Smatrix,
perturbatively around the Minkowski vacuum.
Original languageEnglish
Article number22
Pages (from-to)2-13
Number of pages12
JournalClassical and quantum gravity
Publication statusPublished - 21 Nov 2014


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