The essential singularity in Einstein's gravity can be avoidable if the preconditions of
Penrose's theorem can be bypassed, ie, if the strong energy condition is broken in the …

Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

The recent opening of gravitational wave astronomy has shifted the debate about black hole
mimickers from a purely theoretical arena to a phenomenological one. In this respect …

For distant observers, black holes are trapped spacetime domains bounded by apparent
horizons. We review properties of the near-horizon geometry emphasizing the …

We develop a number of novel “black-bounce” spacetimes. These are specific regular black
holes where the area radius always remains nonzero, thereby leading to a “throat” that is …

We study the light rings and shadows of an uniparametric family of spherically symmetric
geometries interpolating between the Schwarzschild solution, a regular black hole, and a …

Given the recent development of rotating black-bounce-Kerr spacetimes, for both theoretical
and observational purposes it becomes interesting to see whether it might be possible to …

Mass inflation is a well established instability, conventionally associated to Cauchy horizons
(which are also inner trapping horizons) of stationary geometries, leading to a divergent …

A bstract Generic models of regular black holes have separate outer and inner horizons,
both with nonzero surface gravity. It has been shown that a nonzero inner horizon surface …

Recently, Bonanno et al.[Dust collapse in asymptotic safety: A path to regular black holes,
Phys. Rev. Lett. 132, 031401 (2024) PRLTAO 0031-9007 10.1103/PhysRevLett …