The Ernst Equation on a Riemann Surface

TL;DR

This paper extends the Ernst equation to arbitrary Riemann surfaces, enabling the construction of new exact vacuum solutions in general relativity with complex topologies and potential applications in string theory.

Contribution

It formulates the Ernst equation on Riemann surfaces, revealing a new class of solutions with non-trivial topology and extending the Geroch group.

Findings

Constructed new exact solutions with black holes connected by cosmic strings.

Identified a subset of Riemann surfaces admitting non-trivial Ernst fields.

Discussed implications for string theory and topological degrees of freedom.

Abstract

The Ernst equation is formulated on an arbitrary Riemann surface. Analytically, the problem reduces to finding solutions of the ordinary Ernst equation which are periodic along the symmetry axis. The family of (punctured) Riemann surfaces admitting a non-trivial Ernst field constitutes a ``partially discretized'' subspace of the usual moduli space. The method allows us to construct new exact solutions of Einstein's equations in vacuo with non-trivial topology, such that different ``universes'', each of which may have several black holes on its symmetry axis, are connected through necks bounded by cosmic strings. We show how the extra topological degrees of freedom may lead to an extension of the Geroch group and discuss possible applications to string theory.