108 citations · 875 across the 25 of their papers we have counts for
15 papers · 1 filter
Revisiting Flat Rotation Curves in Chern-Simons Modified Gravity
Waleed El Hanafy, Mahmoud Hashim, G. G. L. Nashed
We revisit slow rotating black hole (BH) solutions in Chern-Simons modified gravity (CSMG) by considering perturbative solution about Schwarzschild BH. In particular, the case when…
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…
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…
Phase Portraits of general f(T) Cosmology
A. Awad, W. El Hanafy, G. G. L. Nashed +1
We use dynamical system methods to explore the general behaviour of cosmology. In contrast to the standard applications of dynamical analysis, we present a way to transform…
Constant-roll Inflation in Teleparallel Gravity
A. Awad, W. El Hanafy, G. G. L. Nashed +2
We investigate in detail the implications of the constant-roll condition on the inflationary era of a scalar field coupled to a teleparallel gravity. The resulting cosmologi…
Generic Phase Portrait Analysis of the Finite-time Singularities and Generalized Teleparallel Gravity
W. El Hanafy, G. G. L. Nashed
We analyze the common four types of the finite-time singularities using a generic framework of the phase portrait geometric approach. This technique requires that the Friedmann sys…
Analytic rotating black hole solutions in -dimensional gravity
G. G. L. Nashed, W. El Hanafy
A non-diagonal vielbein ansatz is applied to the -dimension field equations of gravity. An analytical vacuum solution is derived for the quadratic polynomial $f(T)=T+εT^2…
Einstein Geometrization Philosophy and Differential Identities in PAP-Geometry
M. I. Wanas, Nabil L. Youssef, W. El Hanafy +1
The importance of Einstein's geometrization philosophy, as an alternative to the least action principle, in constructing general relativity (GR), is illuminated. The role of differ…
Bounce inflation in Cosmology: A unified inflaton-quintessence field
Kazuharu Bamba, G. G. L. Nashed, W. El Hanafy +1
We investigate a bounce inflation model with a graceful exit into the Friedmann-Robertson-Walker (FRW) decelerated Universe within gravity framework, where is the torsio…
The Hidden Flat Like Universe II: Quasi inverse power law inflation by gravity
W. El Hanafy, G. G. L. Nashed
In a recent work, a particular class of gravity, where is the teleparallel torsion scalar, has been derived. This class has been identified by flat-like universe (FLU) a…
Exact Teleparallel Gravity of Binary Black Holes
W. El Hanafy, G. G. L. Nashed
An exact solution of two singularities in the teleparallel equivalent to general relativity theory has been obtained. A holographic visualization of the binary black holes (BBHs) s…
Graceful Exit Inflation in Gravity
G. G. L. Nashed, W. El Hanafy, Sh. Kh. Ibrahim
We apply a quadratic teleparallel torsion scalar of the field equations to the spatially flat Friedmann-Robertson-Walker (FRW) model. We assume two perfect fluid co…
Pure Geometric Field Theory: Description of Gravity and Material Distribution
M. I. Wanas, Nabil L. Youssef, W. El Hanafy
A field theory is constructed in the context of parameterized absolute parallelism geometry. The theory is shown to be a pure gravity one. It is capable of describing the gravitati…
A Built-in Inflation in the -Cosmology
G. G. L. Nashed, W. El Hanafy
In the present work we derive an exact solution of an isotropic and homogeneous Universe governed by gravity. We show how the torsion contribution to the FRW cosmology can p…
Strong Field of Binary Systems And Its Effects On Pulsar Arrival Times
M. I. Wanas, N. S. Awadalla, W. S. El Hanafy
In the present work, the exact solution of Einstein's field equations which has been given by Curzon in 1924 representing the field of a static binary system is reviewed. An adapte…