An infrared on-shell action in asymptotically flat spacetimes

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• Ana-Maria Raclariu, Kings College London
• Thursday 24 October 2024, 13:00-14:00
• Potter Room (B1.19).

If you have a question about this talk, please contact Bernardo Zan.

One of the main entries in the AdS/CFT dictionary is a relation between the bulk on-shell partition function with specified boundary conditions and the generating function of correlation functions of primary operators in the boundary CFT . In this talk, I will show how to construct a similar relation for gravity in 4d asymptotically flat spacetimes. For simplicity, we will restrict to the leading infrared sector, where a careful treatment of soft modes and their canonical partners leads to a non-vanishing on-shell action. I will show that this action localizes to a codimension-2 surface and coincides with the generating function of 2d CFT correlators involving insertions of Kac-Moody currents. The latter were previously shown, using effective field theory methods, to reproduce the leading soft graviton theorems in 4d. I will conclude with comments on the implications of these results for the computation of soft charge fluctuations in the vacuum.

This talk is part of the Quantum Fields and Strings Seminars series.

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