Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and
more generally fundamental physics, particularly with regards to the existence of additional …

Simpson and Visser recently proposed a phenomenological way to avoid some kinds of
space-time singularities by replacing a parameter whose zero value corresponds to a …

The so-called black-bounce mechanism of singularity suppression, proposed by Simpson
and Visser, consists of replacing the spherical radius r in the metric tensor with r 2+ a 2, a …

In this paper, we study the deflection of light by a class of phantom black hole and wormhole
solutions in the weak limit approximation. More specifically, in the first part of this work we …

The widely discussed “black-bounce” mechanism of removing a singularity at in a
spherically symmetric space-time, proposed by Simpson and Visser, consists in removing …

We apply the Simpson-Visser phenomenological regularization method to a cylindrically
symmetric solution of the Einstein-Maxwell equations known as an inverted black hole. In …

We construct generic spherically symmetric thin-shell gravastars by using the cut-and-paste
procedure. We take considerable effort to make the analysis as general and unified as …

It is shown that an arbitrary static, spherically symmetric metric can be presented as an exact
solution of a scalar-tensor theory (STT) of gravity with certain nonminimal coupling function …

This review dealt with generalized Melvin solutions for simple finite-dimensional Lie
algebras. Each solution appears in a model which includes a metric and n scalar fields …

Quasinormal modes of massless test scalar field in the background of gravitational field for a
non-extremal dilatonic dyonic black hole are explored. The dyon-like black hole solution is …