Very compact objects probe extreme gravitational fields and may be the key to understand
outstanding puzzles in fundamental physics. These include the nature of dark matter, the …

In this white paper, we discuss the prospects for characterizing and identifying dark matter
using gravitational waves, covering a wide range of dark matter candidate types and signals …

We analytically calculate the influence of a plasma on the shadow of a black hole (or of
another compact object). We restrict to spherically symmetric and static situations, where the …

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 …

We investigate gravitational lensing by a primary photon sphere which is a sphere filled with
unstable circular light orbits, and by a secondary photon sphere on a wormhole throat in a …

Blázquez-Salcedo et al.[Phys. Rev. Lett. 126, 101102 (2021) PRLTAO 0031-9007
10.1103/PhysRevLett. 126.101102] obtained asymptotically flat traversable wormhole …

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 …

An analytical solution representing traversable asymptotically flat and symmetric wormholes
was obtained without adding exotic matter in two different theories independently: in the …

In this work, we intend to explore wormhole geometries in the framework of f (R, L m) gravity.
We derive the field equations for the generic f (R, L m) function by assuming the static and …

The general parametrization for spacetimes of spherically symmetric Lorentzian, traversable
wormholes in an arbitrary metric theory of gravity is presented. The parametrization is similar …