Axion-Dilaton Black Holes

TL;DR

This paper explores the properties of charged axion-dilaton black holes in string theory, highlighting their thermodynamics, supersymmetry, and the existence of stable particle-like solutions called holons.

Contribution

It introduces the concept of holons as stable, zero-entropy black hole solutions and discusses their potential splitting from nearly extreme black holes.

Findings

Hawking temperature and entropy depend on supercharges.

Existence of supersymmetric extreme solutions.

Identification of stable holons with zero entropy.

Abstract

In this talk some essential features of stringy black holes are described. We consider charged four-dimensional axion-dilaton black holes. The Hawking temperature and the entropy of all solutions are shown to be simple functions of the squares of supercharges, defining the positivity bounds. Spherically symmetric and multi black hole solutions are presented. The extreme solutions have some unbroken supersymmetries. Axion-dilaton black holes with zero entropy and zero area of the horizon form a family of stable particle-like objects, which we call holons. We discuss the possibility of splitting of nearly extreme black holes into holons.