DATA: 06-06-2018

Rashmish Mishra (INFN Pisa) Past few years have seen a resurgence in theoretical activities towards understanding the IR structure of gauge theories and gravity. Recent work has pointed to a 2D CFT like structure in the S-matrix of the scattering amplitudes in 4D flat space. In this talk, I will use holography to generalize the idea to 4D AdS space, where previously such symmetries were thought to be absent. Guided by the appearance of 3D Chern-Simons (CS) fields in soft limit of flat space scattering processes, asymptotic symmetries of AdS space are shown to arise by a CS gauging of the dual CFT, in a large probe limit. Flat space analogs for super-translation, super-rotation, soft limit and memory are pointed out. This construction addresses several issues from flat space analysis. Using electromagnetic duality of abelian AdS gauge theory, the external gauging is made more intrinsic, and generalizations to the non-abelian case are pointed out.


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