Fundamental Strings and Black Holes

TL;DR

This paper explores a thermodynamic framework linking highly excited string states to black holes in specific string theories, including charged and uncharged cases, and extends to extremal and non-extremal black holes with magnetic charges.

Contribution

It introduces a black hole thermodynamic description for excited string states and generalizes to various black hole charge configurations in different string theories.

Findings

Establishes a thermodynamic analogy between string states and black holes.

Extends the framework to extremal and non-extremal black holes with magnetic charges.

Provides insights into the microscopic structure of black holes in string theory.

Abstract

We propose a black hole thermodynamic description of highly excited charged and uncharged perturbative string states in 3+1 dimensional type II and 4+1 dimensional heterotic string theory. We also discuss the generalization to extremal and non-extremal black holes carrying magnetic charges.