Corotating binary systems of identical Kerr-Newman black holes

TL;DR

This paper derives and analyzes models of two identical, corotating Kerr-Newman black holes with electric charge, providing explicit solutions and thermodynamic properties, and exploring their physical limits.

Contribution

It introduces two new 4-parameter models of corotating Kerr-Newman black hole binaries with electric charge, including explicit horizon and thermodynamic expressions.

Findings

Explicit solutions for corotating Kerr-Newman binary black holes.

Thermodynamic properties satisfying the Smarr relation.

Analysis of physical limits of the models.

Abstract

In the present paper binary configurations of identical corotating Kerr-Newman black holes separated by a massless strut are derived and studied. After solving the axis conditions and establishing the absence of magnetic charges in the solution, one gets two 4-parametric corotating binary black hole models endowed with electric charge, where each source contains equal/opposite electric charge in the first/second configuration. Since the black hole horizons are given by concise expressions in terms of physical parameters, all their thermodynamical properties satisfying the Smarr relation for the mass are also obtained. We discuss the physical limits of both models.