34 citations · 296 across the 22 of their papers we have counts for
11 papers · 1 filter
Analytic semiclassical backreaction of a Schwarzschild black hole in a finite cavity: horizon shift, temperature renormalization, and canonical stability in the Hartle-Hawking State
G. G. L. Nashed, Alnadhief H. A. Alfedeel, Tiberiu Harko
We construct an analytic model of static semiclassical backreaction for a Schwarzschild black hole in the Hartle--Hawking state enclosed within a finite spherical cavity. Using a m…
Quintessence phase of the late-time Universe in gravity
Shambel Sahlu, Bhupendra Kumar Shukla, Rishi Kumar Tiwari +2
In this paper, we have studied the late-time accelerating expansion of the Universe using the matter-geometry coupled gravity model, where is the non-metricity sc…
Bouncing behavior in gravity: Phantom crossing and energy conditions
M. Koussour, N. Myrzakulov, Javlon Rayimbaev +2
In this work, we investigate the bouncing behavior of the universe within the framework of gravity, using a simple form of (where is a f…
Probing Weyl-type gravity: Cosmological implications and constraints
Alnadhief H. A. Alfedeel, M. Koussour, N. Myrzakulov
In this paper, we investigate the cosmological implications and constraints of Weyl-type gravity. This theory introduces a coupling between the non-metricity and the…
Perturbations in Bianchi Type-I spacetimes with varying Lambda, G
Alnadhief H. A. Alfedeel, Maye Elmardi, Amare abebe
In this paper, we investigate the evolution of cosmological perturbations within the context of Bianchi Type spacetimes. We consider models containing viscous fluids with evolv…
Cosmological implications of the constant jerk parameter in gravity theory
N. Myrzakulov, M. Koussour, Alnadhief H. A. Alfedeel +1
This study delves into modified gravity theories that are equivalent to General Relativity but involve the torsion or non-metricity scalar instead of the curvature scalar. Specific…
Modeling cosmic acceleration with a generalized varying deceleration parameter
M. Koussour, N. Myrzakulov, Alnadhief H. A. Alfedeel +2
Understanding the accelerating expansion of the Universe remains a fundamental challenge in modern cosmology. In this paper, we investigate a cosmological model parametrized by a g…
Impact of dark energy on the equation of state in light of the latest cosmological data
N. Myrzakulov, M. Koussour, Alnadhief H. A. Alfedeel +1
We reconstruct the effective Equation of State (EoS) within the framework of General Relativity (GR) theory in a homogeneous and isotropic FLRW Universe, which is assumed to be com…
A Generalized Solution of Bianchi Type-V Models with Time-dependent and
Alnadhief H. A. Alfedeel, Amare Abebe, Hussam M. Gubara
We study the homogeneous but anisotropic Bianchi type-V cosmological model with time-dependent gravitational and cosmological "constants". Exact solutions of the Einstein field equ…
The Lemaitre Model and the Generalisation of the Cosmic Mass
Alnadhief A. H. Alfedeel, Charles Hellaby
We consider the spherically symmetric metric with a comoving perfect fluid and non-zero pressure -- the Lemaitre metric -- and present it in the form of a calculational algorithm.…
Solving the Observer Metric
Charles Hellaby, Alnadhief H. A. Alfedeel
The analysis of modern cosmological data is becoming an increasingly important task as the amount of data multiplies. An important goal is to extract geometric information, i.e. th…