Dyonic black holes in effective string theories

TL;DR

This paper investigates dyonic black hole solutions within heterotic string theory, analyzing their thermodynamic properties and how these differ when either electric or magnetic charge is absent, using a perturbative approach.

Contribution

It provides a perturbative analysis of dyonic black holes in heterotic string theory up to second order, deriving temperature expressions and exploring charge-dependent behaviors.

Findings

Temperature depends on mass and charges with distinct behaviors when one charge vanishes.

Qualitative differences in black hole thermodynamics are identified between purely electric or magnetic cases.

Second-order perturbative corrections influence black hole properties significantly.

Abstract

The spherical symmetric dyonic black hole solutions of the effective action of heterotic string are studied perturbatively up to second order in the inverse string tension. An expression for the temperature in term of the mass and the electric and magnetic charge of the black hole is derived and it is shown that its behaviour is qualitatively different in the two special cases where either the electric or the magnetic charge vanishes