Electromagnetic source for the Kerr-Newman geometry

TL;DR

This paper presents a model where nonlinear electrodynamics coupled with gravity produces regular, rotating black hole solutions with a superconducting current replacing the Kerr ring singularity, potentially explaining stable spinning objects.

Contribution

It introduces a new class of regular Kerr-Newman solutions with superconducting currents, replacing singularities with physically plausible sources within nonlinear electrodynamics coupled to gravity.

Findings

Existence of regular, asymptotically Kerr-Newman solutions with de Sitter interior.

Kerr ring singularity replaced by a superconducting current.

Solutions describe stable, spinning black holes and solitons.

Abstract

Source-free equations of nonlinear electrodynamics minimally coupled to gravity (NED-GR) admit regular axially symmetric asymptotically Kerr-Newman solutions, which describe electrically charged rotating black holes and spinning solitons. Asymptotic analysis of solutions shows the existence of de Sitter vacuum interior which has the properties of a perfect conductor and an ideal diamagnetic. The Kerr ring singularity (a naked singularity in the case without horizons) is replaced with a superconducting current, which serves as a nondissipative source of the Kerr-Newman fields and can be responsible for an unlimited life time of a spinning object.