Newman-Janis algorithm's application to regular black hole models

Understand

We examine the Newman-Janis algorithm's application to an exact regular static solution sustained by a minimally coupled scalar field with a non-standard kinetic term.

• Although coordinate complexification leads to a regular Kerr-like black hole, we are facing discrepancies in Einstein's equations in a fairly small domain, for which the regularizing parameter is responsible.
• Outside this most intriguing region, the geometry is nothing but the standard Kerr spacetime.