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 …

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 …

We investigate a nonsingular black hole spacetime representing a strong deformation of the
Schwarzschild solution with mass M by an additional hair ℓ, which may be hierarchically …

ABSTRACT The Event Horizon Telescope (EHT) has recently observed the image and
shadow of the supermassive compact object Sagittarius A*(Sgr A*). According to the EHT …

It is a common belief that a theory of quantum gravity should ultimately cure curvature
singularities which are inevitable within general relativity, and plague for instance the …

We consider the recent datasets of quasiperiodic oscillations from eight different low mass x-
ray binaries. We here interpret their physical features in the context of given regular black …

The analysis of the properties of the X-ray radiation emitted from geometrically thin accretion
disks around black holes can be a powerful tool to test General Relativity in the strong field …

It is a common belief that a theory of quantum gravity should ultimately cure curvature
singularities which are inevitable within General Relativity, and plague for instance the …

We investigate the orbital and oscillatory motion of test particles around a rotating hairy
black hole in the context of Horndeski gravity. This black hole consists of three parameters …