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13 papers · 2 filters
The Cosmological Black Hole
Zacharias Roupas
We briefly review the recent novel solution of General Relativity, we call the cosmological black hole, firstly discovered in [Roupas, Z. Eur. Phys. J. C 82, 255 (2022)]. A dark en…
Non-trivial class of anisotropic compact stellar model in Rastall gravity
G. G. L. Nashed, W. El Hanafy
We investigated Rastall gravity, for an anisotropic star with a static spherical symmetry, whereas the matter-geometry coupling as assumed in Rastall Theory (RT) is expected to pla…
The Variational principle, Conformal and Disformal transformations, and the degrees of freedom
Alexey Golovnev
Conformal and disformal transformations are now being very intensively studied in the context of various modified gravity theories. In particular, some special classes of them can…
Slow-rotating black holes with potential in dynamical Chern-Simons modified gravitational theory
G. G. L. Nashed, Shin'ichi Nojiri
The Chern-Simons amended gravity theory appears as a low-energy effective theory of string theory. The effective theory includes an anomaly-cancelation correction to the Einstein-H…
Multi-horizons black hole solutions, photon sphere and perihelion shift in weak ghost-free Gauss-Bonnet theory of gravity
G. G. L. Nashed, Shin'ichi Nojiri
Among the modified gravitational theories, the ghost-free Gauss-Bonnet (GFGB) theory of gravity has been considered from the viewpoint of cosmology. The best way to check its appli…
Revisiting diagonal tetrads: New Black Hole solutions in gravity
Adel Awad, Alexey Golovnev, María-José Guzmán +1
We study various forms of diagonal tetrads that accommodate Black Hole solutions in gravity with certain symmetries. As is well-known, vacuum spherically symmetric diagonal…