Talk detail

Participant	Strominger, Andrew
Institution	Harvard University - 17 Oxford Street - Cambridge - Massachusetts - USA

Session	PS	Accepted		Order	Time
Talk	Oral abstract	Title	Conformal Symmetry in the Sky
Coauthors
Abstract	Recent observations indicate that the sky contains black holes whose horizons are spinning at nearly the speed of light. General relativity implies that the dynamics very near the horizon of such extreme black holes is governed by an enhanced infinite-dimensional conformal symmetry - identical to the enhanced symmetry observed near the critical points of a variety of condensed matter systems. Potential observational consequences of this symmetry are explored.
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Session	ST3	Accepted		Order	Time
Talk	Oral abstract	Title	Gravitational Memory, the Soft Graviton Theorem and BMS Symmetry
Coauthors
Abstract	We show that Weinberg’s 1965 soft graviton theorem for the S-matrix can be derived as a consequence of the supertranslational symmetry of general relativity discovered by Bondi, van der Burgh, Metzner and Sachs in 1962. Moreover we show that the gravitational memory effect is simply a Fourier transform of the soft graviton theorem and can be understood as a radiation-induced BMS-supertranslation.
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