Stretched Horizon for Non-Supersymmetric Black Holes

TL;DR

This paper explores the concept of the stretched horizon in black holes, extending the idea from supersymmetric cases to non-supersymmetric four-dimensional black holes, and finds it becomes significant only at small masses.

Contribution

It provides a computation of the stretched horizon for non-supersymmetric black holes, expanding the concept beyond supersymmetric scenarios.

Findings

Stretched horizon larger than event horizon at small masses.

Analysis applies to four-dimensional black holes.

Extends the concept from supersymmetric to non-supersymmetric cases.

Abstract

We review the idea of stretched horizon for extremal black holes in supersymmetric string theories, and we compute it for non-supersymmetric black holes in four dimensions. Only for small masses of the order of the Veneziano wavelength is the stretched horizon bigger than the event horizon.