An Introduction to Celestial Holography and the flat space limit of AdS/CFT - Leonardo P. de Gioia

Abstract: Celestial Holography is a proposal for applying the holographic principle to asymptotically flat spacetimes which conjectures that a quantum theory of gravity in asymptotically flat backgrounds should be dual to a codimension two Celestial Conformal Field Theory living in the celestial sphere at null infinity. This proposal emerged from the observation that the bulk S-matrix written on a basis of boost eigenstates behaves in many ways as a two-dimensional conformal correlator. In particular, soft theorems allow for the identification of certain soft modes in the bulk theory as two-dimensional currents and a candidate stress tensor in the boundary theory. In this talk, I will review the motivation for Celestial Holography that emerged from soft symmetries, and present some of its features. Finally, I will review some recent developments suggesting that Celestial Holography naturally emerges from AdS/CFT in the flat space limit of the latter. This perspective may provide new tools for the understanding of Celestial Holography by the application of the wide range of results from holography in asymptotically AdS spacetimes.

[@ArtisanTony]

You have to have a PhD to understand the basics of this :)

[@Achrononmaster]

Pretty High Dementedness or Pretty High Delinquency? ;-)