Holography with Null Boundaries

TL;DR

This paper explores a new holographic correspondence involving null boundaries, string theory, and non-commutative open string theory, expanding the understanding of quantum gravity beyond traditional AdS spacetimes.

Contribution

It introduces a holographic framework derived from string theory with null boundaries, connecting D1-D5 branes and fundamental strings, and analyzing black hole dynamics in this context.

Findings

Supports radiation escape to null infinity.

Interpolates between AdS3 and six-dimensional metrics.

Provides a new perspective on quantum information encoding.

Abstract

One of the key issues in holography is going beyond $\mathrm{AdS}$ and defining quantum gravity in spacetimes with a null boundary. Recent examples of this type involve linear dilaton asymptotics and are related to the $T \overline{T}$ deformation. We present a holographic correspondence derived from string theory, which is an example of a kind of celestial holography. The holographic definition is a spacetime non-commutative open string theory supported on D1-D5 branes together with fundamental strings. The gravity solutions interpolate between $\mathrm{AdS}_3$ metrics and six-dimensional metrics. Radiation can escape to null infinity, which makes both the encoding of quantum information in the boundary and the dynamics of black holes quite different from $\mathrm{AdS}$ spacetimes.