Asymptotic symmetries and subleading soft graviton theorem

Aug 10, 2014
14 pages
Published in:
  • Phys.Rev.D 90 (2014) 12, 124028
  • Published: Dec 8, 2014
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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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