Asymptotic level density in heterotic string theory and rotating black holes

TL;DR

This paper derives asymptotic state densities in heterotic string theory, computes gyromagnetic couplings, and explores the potential of fundamental strings to model black hole microstates with various physical parameters.

Contribution

It provides new asymptotic formulas for state densities and gyromagnetic couplings, advancing understanding of string-black hole correspondence.

Findings

Asymptotic density formulas match expected growth rates.

Gyromagnetic couplings are computed for all physical states.

Results suggest fundamental strings could model black hole microphysics.

Abstract

We calculate the density of states with given mass and spin in string theory and obtain asymptotic formulas. We also compute the tree-level gyromagnetic couplings for arbitrary physical states in the heterotic string theory. These results are then applied to study whether fundamental strings can consistently describe the microphysics of the black hole horizon in the case of a general classical solution characterized by mass, charge and angular momentum.