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 …

Abstract The Event Horizon Telescope (EHT) Collaboration recently published the first
images of the supermassive black holes in the cores of the Messier 87 and Milky Way …

By considering the quantum Oppenheimer-Snyder model in loop quantum cosmology, a
new quantum black hole model whose metric tensor is a suitably deformed Schwarzschild …

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 …

Eikonal quasinormal modes (QNMs) of black holes (BHs) and parameters of null geodesics,
ultimately tied to the appearance of BHs to external observers, are known to be related, and …

We write explicitly the complete Lorentzian metric of a singularity-free spacetime where a
black hole transitions into a white hole located in its same asymptotic region. In particular …

We study scalar test-field perturbations on top of a Kerr–black-bounce background, ie, a
family of rotating regular black holes and/or rotating traversable wormholes that can mimic …

We present a rotating regular black hole whose inner horizon has zero surface gravity for
any value of the spin parameter and is, therefore, stable against mass inflation. Our metric is …

A bstract We illustrate that regular black holes and horizonless stars, typically considered as
quite distinct families of black hole mimickers, are intimately intertwined. We show that any …