Comments on the IIA NS5-brane

TL;DR

This paper investigates the supergravity description of coincident IIA NS5-branes at large N, revealing non-vanishing graviton absorption at zero coupling and analyzing the stress tensor correlator holographically.

Contribution

It provides new insights into the absorption cross section and stress tensor correlator for IIA NS5-branes using supergravity and holography, especially at large N.

Findings

Absorption cross section remains non-zero at zero string coupling for certain energies.

Derived a holographic expression for the stress energy tensor two-point function.

Commented on the structure of the stress tensor correlator in the NS5-brane theory.

Abstract

We study $N$ coincident IIA NS5-branes at large $N$ using supergravity. We show that the absorption cross section for gravitons in this background does not vanish at zero string coupling for energies larger than $m_s/\sqrt{N}$ ($m_s$ is the string scale). Using a holographic description of the intrinsic theory of the IIA NS5-branes, we find an expression for the two point function of the stress energy tensor, and comment on its structure.