Emission from the D1D5 CFT

TL;DR

This paper develops a framework connecting CFT amplitudes to emission processes, constructs vertex operators for D1D5 system, and confirms the duality by matching radiation rates from CFT and gravity descriptions.

Contribution

It introduces a general formulation for relating CFT amplitudes to emission processes and constructs specific vertex operators for the D1D5 system, validating the duality with gravity.

Findings

CFT emission amplitudes match gravity predictions

Constructed vertex operators for minimally coupled scalars

Established a relation between spectral flow and emission processes

Abstract

It is believed that the D1D5 brane system is described by an 'orbifold CFT' at a special point in moduli space. We first develop a general formulation relating amplitudes in a d-dimensional CFT to absorption/emission of quanta from flat infinity. We then construct the D1D5 vertex operators for minimally coupled scalars in supergravity, and use these to compute the CFT amplitude for emission from a state carrying a single excitation. Using spectral flow we relate this process to one where we have emission from a highly excited initial state. In each case the radiation rate is found to agree with the radiation found in the gravity dual.