Ergosphere and shadow of a rotating regular black hole

Understand

The spacetime singularities in classical general relativity predicted by the celebrated singularity theorems are formed at the end of gravitational collapse.

• Quantum gravity is the expected theory to resolve the singularity problem, but we are now far from it.
• Therefore attention has shifted to models of regular black holes free from the singularities.
• A spherically symmetric regular toy model was obtained by Dymnikova (1992) which we demonstrate as an exact solution of Einstein's field equations coupled to nonlinear electrodynamics for a Lagrangian with parameter $b$ related to magnetic charge.