The optical appearance of a body compact enough to feature an unstable bound orbit, when
surrounded by an accretion disk, is expected to be dominated by a luminous ring of radiation …

We study the stability of theories where the gravitational action has arbitrary algebraic
dependence on the three first traces of the Riemann tensor: the Ricci tensor, the co-Ricci …

We consider equilibrium models of spherical boson stars in Palatini f (Script R)= Script R+ ξ
Script R 2 gravity and study their collapse when perturbed. The Einstein-Klein-Gordon …

In this work, we study the shadow of Born–Infeld (BI) black holes with magnetic monopoles
and Schwarzschild black holes immersed in the BI uniform magnetic field. Illuminated by a …

We consider the metric-affine formulation of bumblebee gravity, derive the field equations,
and show that the connection can be written as Levi-Civita of a disformally related metric in …

Low energy imprints of modifications to general relativity are often found in pressure balance
equations inside stars. These modifications are then amenable to tests via astrophysical …

We start with a brief overview of the basic thermodynamic properties of the Born-Infeld metric
in AdS spacetime. Using the concept of the enthalpy characterizing the total mass of the …

In this paper, metric-affine theories in which the gravity Lagrangian is built using (projectively
invariant) contractions of the Ricci tensor with itself and with the metric (Ricci-based gravity …

Abstract The Polynomial Affine Gravity is an alternative gravitational model, where the
interactions are mediated solely by the affine connection, instead of the metric tensor. In this …

Abstract Eddington-inspired Born–Infeld gravity is an important modification of Einstein's
general relativity, which can give rise to nonsingular cosmologies at the classical level, and …