Spinning Black Binaries in de Sitter space

TL;DR

This paper constructs stationary, rotating black binary solutions in de Sitter space, revealing non-uniqueness in general relativity and providing initial data for binary merger studies.

Contribution

It introduces explicit solutions for spinning black binaries in de Sitter space, demonstrating non-uniqueness and offering a foundation for merger simulations.

Findings

Black binary solutions have less entropy than single black holes with same parameters.

Solutions demonstrate continuous non-uniqueness in vacuum general relativity.

Provides initial data for spinning binary black hole mergers.

Abstract

We construct stationary, rotating black binaries in general relativity with a positive cosmological constant. We consider identical black holes with either aligned or anti-aligned spins. Both cases have less entropy than the corresponding single Kerr/Schwarzschild de Sitter black hole with the same total angular momentum and cosmological horizon entropy. Our solutions establish continuous non-uniqueness in general relativity without matter. They also provide initial data for the spinning binary merger problem (when orbital angular momentum is added).