Asymptotic symmetries and subleading soft graviton theorem
Aug 10, 201414 pages
Published in:
- Phys.Rev.D 90 (2014) 12, 124028
- Published: Dec 8, 2014
e-Print:
- 1408.2228 [hep-th]
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Abstract: (arXiv)
Motivated by the equivalence between soft graviton theorem and Ward identities for the supertranslation symmetries belonging to the BMS group, we propose a new extension (different from the so-called extended BMS) of the BMS group which is a semi-direct product of supertranslations and Diff(S^2). We propose a definition for the canonical generators associated to the smooth diffeomorphisms and show that the resulting Ward identities are equivalent to the subleading soft graviton theorem of Cachazo and Strominger.Note:
- 25 pages, published version
- 04.60.-m
- gravitation
- graviton
- Ward identity
- diffeomorphism
- field theory: vector
- symmetry: Virasoro
- phase space
- symplectic
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