MG14 - Talk detail |
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Participant |
Mohd, Arif | |||||||
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Institution |
SISSA - 265 via Bonomea - Trieste - Trieste - Italy | |||||||
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Session |
EU2 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
Asymptotic Symmetries and Soft-Theorems | |||||
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Abstract |
Holographic description of quantum gravity in flat space is not yet known. Therefore, any calculation in flat space that has a holographic nature can potentially provide us a clue for developing holography for flat space. For quantum field theories in Minkowski space, S-matrix is a holographic observable by definition. In this talk I will show how Weinberg's soft-photon theorem can be derived as a tree-level Ward identity for a symmetry of the S-matrix. The symmetry in question is a certain diagonal subgroup of the product group of gauge transformations on the future and past null infinity. This symmetry is broken in the Fock vacuum and the soft-photons are the corresponding Goldstone bosons. |
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