Gravitational waves (GWs) provide a unique opportunity to test general relativity (GR) in the
highly dynamical, strong-field regime. So far, the majority of the tests of GR with GW signals …

One of the most promising avenues to perform numerical evolutions in theories beyond
general relativity is the fixing-the-equations approach, a proposal in which new “driver” …

In the present work, we investigate the gravitational lensing effects of two quantum-modified
black hole models recently proposed in effective quantum gravity. The light deflection angles …

In nonminimally coupled theories where a scalar field ϕ is coupled to the Ricci scalar,
neutron stars (NSs) can have scalar charges through an interaction with matter mediated by …

Black holes represent an ideal laboratory to test Einstein's theory of general relativity and
alternative theories of gravity. Among the latter, Einstein-scalar–Gauss–Bonnet Theories …

Recently, theoretical studies on the bumblebee gravity model, a nonminimally coupled
vector-tensor theory that violates the Lorentz symmetry, have flourished, with a simultaneous …

Recent efforts to numerically simulate compact objects in alternative theories of gravity have
largely focused on the time-evolution equations. Another critical aspect is the construction of …

Spherical black hole (BH) solutions have been found in the bumblebee gravity where a
vector field nonminimally couples to the Ricci tensor. We study dynamic (in) stability …

In this paper, we apply a novel approach based on physics-informed neural networks to the
computation of quasinormal modes of black hole solutions in modified gravity. In particular …

Scalar-Gauss-Bonnet (sGB) gravity with an additional coupling between the scalar field and
the Ricci scalar exhibits very interesting properties related to black hole stability, evasion of …