Entropy Spectrum of a Carged Black Hole of Heterotic String Theory via Adiabatic Invariance

TL;DR

This paper investigates the entropy spectrum of a charged heterotic string black hole using adiabatic invariance and Bohr-Sommerfeld quantization, revealing an equally spaced spectrum without requiring quasinormal mode analysis.

Contribution

It demonstrates that the entropy spectrum of a charged heterotic string black hole is equally spaced, using a method independent of quasinormal modes and small charge assumptions.

Findings

Entropy spectrum is equally spaced.

Method does not rely on quasinormal mode analysis.

No small charge limit needed.

Abstract

Using adiabatic invariance and the Bohr-Sommerfeld quantization rule we investigate the entropy spectroscopy of a charged black hole of heterotic string theory. It is shown that the entropy spectrum is equally spaced identically to the Schwarzschild, Reissner-Nordstr\"om and Kerr black holes. Since the adiabatic invariance method does not use quasinormal mode analysis, there is no need to impose the small charge limit and no confusion on whether the real part or imaginary part is responsible for the entropy spectrum.