# An infrared on-shell action in asymptotically flat spacetimes

- Institution: CERN
- Speaker: Ana-Maria Raclariu
- Year: 2024
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3013593)
- Licence: [CERN](https://copyright.web.cern)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

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. (Online Talk)

## Lectures

1. [An infrared on-shell action in asymptotically flat spacetimes](https://invisiblenetwork.ai/learn/cern/3013593/9e83c1f04c32), 1 h 28 min (CERN's player)