Warm inflation, its different particle physics model implementations, and the implications of
dissipative particle production for its cosmology are reviewed. First, we briefly present the …

We construct the light escape cones of isotropic spot sources of radiation residing in special
classes of reference frames in the Kerr–de Sitter (KdS) black hole spacetimes, namely in the …

We study behaviour of gravitational waves in the recently introduced general relativistic
polytropic spheres containing a region of trapped null geodesics extended around radius of …

By using the Hamiltonian formulation, we demonstrate that the Merton-Garman equation
emerges naturally from the Black-Scholes equation after imposing invariance (symmetry) …

For the Kerr naked singularity (KNS) spacetimes, we study properties of spherical photon
orbits (SPOs) confined to constant Boyer-Lindquist radius r. Some new features of the SPOs …

We study the general motion of photons in the Kerr–de Sitter black-hole and naked
singularity spacetimes. The motion is governed by the impact parameters X, related to the …

I derive general conditions in order to explain the origin of the Vainshtein radius inside
dRGT. The set of equations, which I have called" Vainshtein" conditions are extremal …

We provide a description of a thin accretion disk for a static spherically symmetric black
holes in f (R) gravity. In this regard, we first study the horizons of black holes in f (R) gravity …

We present an extension of general relativity in which the cosmological constant becomes
dynamical and turns out to be conjugate to the Chern–Simons invariant of the Ashtekar …

The Bronnikov model of nonlinear electrodynamics is investigated in general relativity. The
magnetic black hole is considered and we obtain a solution giving corrections to the …