Multi-black holes and instantons in effective string theory

TL;DR

This paper explores multi-black hole solutions within effective string theory, showing how their Euclidean continuations act as instantons that facilitate black hole throat splitting and recombination.

Contribution

It introduces multi-black hole solutions in effective string theory with non-minimal moduli coupling and interprets their Euclidean versions as instantons for black hole topology changes.

Findings

Multi-black hole solutions exist in effective string theory.

Euclidean instantons mediate black hole throat splitting and recombination.

The solutions provide insights into black hole topology transitions.

Abstract

The effective action for string theory which takes into account non-minimal coupling of moduli admits multi-black hole solutions. The euclidean continuation of these solutions can be interpreted as an instanton mediating the splitting and recombination of the throat of extremal magnetically charged black holes.