Astrophysically viable Kerr-like spacetime -- into the eye of the storm

TL;DR

This paper studies a mathematically tractable, rotating regular black hole with a Minkowski core, analyzing its properties and potential astrophysical observables, with implications for testing black hole models.

Contribution

It introduces a Kerr-like spacetime with a Minkowski core that maintains key symmetries and separability, facilitating astrophysical predictions and tests.

Findings

The spacetime admits separability of key equations.

Energy conditions are violated only in a small core region.

The geometry allows straightforward extraction of observable signatures.

Abstract

We analyse a rotating regular black hole with asymptotically Minkowski core. This Kerr-like geometry possesses the full "Killing tower" of nontrivial Killing tensor, Killing-Yano tensor, and principal tensor. The Hamilton-Jacobi equation, the Klein-Gordon equation, and Maxwell's equations are separable. Energy-condition-violating physics is pushed into an arbitrarily small region in the deep core. The geometry has a very high level of mathematical tractability; extraction of astrophysical observables falsifiable/verifiable by the observational community is straightforward.