A toy black hole S-matrix in the D1-D5 CFT

TL;DR

This paper models black hole absorption and emission processes within the D1-D5 CFT by analyzing transitions between Ramond vacua, revealing suppression of angular momentum change processes proportional to powers of 1/N.

Contribution

It introduces a detailed CFT computation of black hole microstate transitions, highlighting how angular momentum changes are suppressed in the orbifold CFT framework.

Findings

Processes changing angular momentum by k units are suppressed as 1/N^k

Transitions between Ramond vacua can be computed using orbifold CFT techniques

The model provides insights into black hole microstate dynamics

Abstract

To model the process of absorption and emission of quanta by an extremal D1-D5 black hole in the dual CFT, we consider transitions between different Ramond vacua via absorption and emission of chiral primaries. We compute the probabilities to reach different CFT states starting with a special Ramond vacuum, using techniques of the orbifold CFT. It is found that the processes involving the change of angular momentum by $k$ units are suppressed as 1/N^k