Counting BPS states of the M-5brane

TL;DR

This paper reviews an on-shell model for counting BPS states of the M5-brane, focusing on tensionless Little String states at intersections in multi-brane configurations on a six-manifold.

Contribution

It introduces an explicit on-shell framework for enumerating BPS states in M5-brane theories, including tensionless Little String states at brane intersections.

Findings

Explicit counting of BPS states in M5-brane configurations.

Identification of tensionless Little String states at brane intersections.

Framework applicable to wrapped M5-branes on complex manifolds.

Abstract

An on-shell model for the supersymmetric index counting multiplicities of BPS states of the M5-brane theory is reviewed. In particular we explicitly study the tensionless Little String states appearing at intersections in a bound state of $N$ 5-branes wrapped on a six-manifold with product topology $M_4\times T^2$.