Celestial holography: An asymptotic symmetry perspective

TL;DR

This paper reviews how infinite-dimensional asymptotic symmetries at spacetime boundaries inform celestial holography, constraining the dual conformal field theory describing quantum gravity in flat space.

Contribution

It highlights the role of boundary symmetries in shaping the celestial holography framework and connects asymptotic symmetries with conformal field theory constraints.

Findings

Asymptotic symmetries impose key constraints on celestial duals.

Boundary symmetries are crucial for understanding flat space holography.

Conformal field theory provides a natural language for these symmetries.

Abstract

We review the role that infinite-dimensional symmetries arising at the boundary of asymptotically flat spacetimes play in the context of the celestial holography program. Once recast into the language of conformal field theory, asymptotic symmetries provide key constraints on the sought-for celestial dual to quantum gravity in flat spacetimes.