Fundamental Strings and Higher Derivative Corrections to d-Dimensional Black Holes

TL;DR

This paper investigates how alpha' corrections influence the thermodynamics and physical properties of d-dimensional black holes carrying two electric charges, revealing increases in entropy and charge/mass ratio across all dimensions.

Contribution

It provides the first detailed analysis of perturbative alpha' corrections to charged black holes in arbitrary dimensions, including thermodynamic properties and entropy calculations.

Findings

Entropy increases with alpha' corrections.

Charge/mass ratio increases with alpha' in all dimensions.

Thermodynamic properties are derived using Euclidean and Wald methods.

Abstract

We study aspects of d-dimensional black holes with two electric charges, corresponding to fundamental strings with generic momentum and winding on an internal circle. The perturbative alpha' corrections to such black holes and their gravitational thermodynamics are obtained. The latter are derived using the Euclidean approach and the Wald formula for the entropy. We find that the entropy and the charge/mass ratio of black holes increase in alpha' for any mass and charges, and in all dimensions.