Abstract / Description of output
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.
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 language | English |
|---|---|
| Article number | 22 |
| Pages (from-to) | 2-13 |
| Number of pages | 12 |
| Journal | Classical and quantum gravity |
| Volume | 31 |
| DOIs | |
| Publication status | Published - 21 Nov 2014 |
