On black holes in heterotic braneworlds

TL;DR

This paper investigates black holes in heterotic braneworld models, revealing instability of black strings, unusual asymptotics, and an exact singular solution where the branes separate at the black hole horizon.

Contribution

It provides the first analysis of black hole solutions in heterotic braneworlds, including stability, asymptotics, and an exact singular solution with brane separation.

Findings

Black string solutions are unstable.

Unusual asymptotic behaviors are observed.

An exact singular solution with brane separation at the Schwarzschild radius.

Abstract

We explore the problem of braneworld black holes in the heterotic braneworld scenario of Lukas, Ovrut, Stelle and Waldram (LOSW). We show that black string solutions are unstable, and demonstrate some unusual asymptotics in the linearized metric. We also solve the fully coupled brane and bulk Einstein equations, finding an exact, though singular, solution which corresponds to a brane black hole in which the branes spike apart at the Schwarzschild radius.