Universal properties of distorted Kerr-Newman black holes

TL;DR

This paper demonstrates that key physical relations like angular momentum, charge, and horizon area inequalities hold universally for axisymmetric, stationary black holes, even when distorted by surrounding matter, extending beyond the Kerr-Newman solution.

Contribution

It generalizes fundamental black hole properties and inequalities to include distorted, axisymmetric, stationary black holes with surrounding matter in Einstein-Maxwell theory.

Findings

Universal inequalities hold for distorted black holes.

Physical relations extend beyond Kerr-Newman solutions.

Results apply to arbitrary axisymmetric, stationary matter distributions.

Abstract

We discuss universal properties of axisymmetric and stationary configurations consisting of a central black hole and surrounding matter in Einstein-Maxwell theory. In particular, we find that certain physical equations and inequalities (involving angular momentum, electric charge and horizon area) are not restricted to the Kerr-Newman solution but can be generalized to the situation where the black hole is distorted by an arbitrary axisymmetric and stationary surrounding matter distribution.