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53 papers · 1 filter
Matter Creation in Unimodular Gravity Cosmology
Víctor H. Cárdenas, Miguel Cruz, Samuel Lepe
We investigate matter creation in the cosmological framework of unimodular gravity. We keep the energy density , pressure , particle number density , and particle number $…
Null geodesics around a black hole with weakly coupled global monopole charge
Mohsen Fathi, J. R. Villanueva, Thiago R. P. Caramês +1
In this paper, we study an asymptotically flat black hole spacetime with weakly nonminimally coupled monopole charge. We analytically and numerically investigate light ray propagat…
Black hole in a generalized Chaplygin-Jacobi dark fluid: shadow and light deflection angle
Mohsen Fathi, J. R. Villanueva, Gilberto Aguilar-Pérez +1
We investigate a generalized Chaplygin-like gas with an anisotropic equation of state, characterizing a dark fluid within which a static spherically symmetric black hole is assumed…
ExaGRyPE: Numerical General Relativity Solvers Based upon the Hyperbolic PDEs Solver Engine ExaHyPE
Han Zhang, Baojiu Li, Tobias Weinzierl +1
ExaGRyPE describes a suite of solvers for numerical relativity, based upon ExaHyPE 2, the second generation of our Exascale Hyperbolic PDE Engine. The presented generation of ExaGR…
Light propagation around a Kerr-like black hole immersed in an inhomogeneous anisotropic plasma in Rastall gravity: Analytical solutions to the equations of motion
Mohsen Fathi, Marco Olivares, José R. Villanueva +1
In this paper, we explore the behavior of light ray trajectories in the exterior geometry of a rotating black hole within the Rastall theory of gravity, which is surrounded by an i…
Spherical particle orbits around a rotating black hole in massive gravity
Mohsen Fathi, J. R. Villanueva, Norman Cruz
In this paper, we present a rotating de Rham-Gabadadze-Tolley black hole with a positive cosmological constant in massive gravity, achieved by applying a modified Newman-Janis algo…