125 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Northern Border UniversitySA30 papers
- Centre National de la Recherche ScientifiqueFR16 papers
- Taibah UniversitySA16 papers
- Cairo UniversityEG12 papers
- Instituto de Astrofísica de AndalucíaES11 papers
- Université Paris CitéFR11 papers
- Astrophysique, Instrumentation et ModélisationFR10 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR10 papers
- Leibniz Institute for Astrophysics PotsdamDE10 papers
- Sorbonne UniversitéFR10 papers
- Astronomical ObservatoryRS9 papers
- CEA Paris-SaclayFR9 papers
17 papers · 1 filter
Stability Analysis Of Fractional Relativistic Polytropes
Mohamed S. Aboueisha, A. S. Saad, Mohamed I. Nouh +3
In astrophysics, the gravitational stability of a self-gravitating polytropic fluid sphere is an intriguing subject, especially when trying to comprehend the genesis and developmen…
Cosmographic analysis of a closed bouncing universe with the varying cosmological constant in gravity
Vinod Kumar Bhardwaj, Anirudh Pradhan, Nasr Ahmed +1
Modeling of matter bounce in gravity has been presented with no violation of the null energy condition. Only a closed universe with negative pressure is allowed in good ag…
Some cosmological features of 4D Gauss-Bonnet gravity with varying cosmological constant
Nasr Ahmed, Ajab A. Alfreedi, Alaa A. Alzulaibani
We explore some cosmological features of the newly suggested 4D Gauss-Bonnet gravity through two different models assuming a varying cosmological constant. Observational constraint…
A non-singular closed bouncing universe without violation of null energy condition
Nasr Ahmed, Tarek M. Kamel, Mohamed I Nouh
A matter bouncing entropy-corrected cosmological model has been suggested. The model allows only positive curvature with negative pressure and no violation of the null energy condi…
Stability Analysis of Relativistic Polytropes
A. S. Saad, M. I. Nouh, A. A. Shaker +1
A main question in astrophysics and cosmology has been the severe stability of the astrophysical objects, whether a particular equilibrium configuration is stable. In this article,…
Note on Dark Energy and Cosmic Transit in a scale-invariance cosmology
Nasr Ahmed, Tarek M. Kamel
In general, the laws of physics are not invariant under a change of scale. To find out whether the 'scale-invariance hypothesis' corresponds to nature or not, a careful examination…
Crossing the phantom divide line in universal extra dimensions
Nasr Ahmed, Anirudh Pradhan
We investigate the cosmic acceleration and the evolution of dark energy across the cosmological constant boundary in universal extra dimensions UED. We adopt an empirical approach…
A Cyclic Universe With Varying Cosmological Constant in gravity
Nasr Ahmed, Sultan Z. Alamri
A new kind of evolution for cyclic models in which the Hubble parameter oscillates and keeps positive has been explored in a specific gravity reconstruction. A singularity…
Cosmological determination to the values of the prefactors in the logarithmic corrected entropy-area relation
Nasr Ahmed, Sultan Z. Alamri
In this paper, we continue investigating the possible values of the pre-factors and in the logarithmic corrected entropy-area relation based on cosmological stability argum…
Ricci-Gauss-Bonnet holographic dark energy in Chern-Simons modified gravity: A flat FLRW quintessence-dominated universe
Nasr Ahmed
We discuss the recently suggested Ricci-Gauss-Bonnet holographic dark energy in Chern-Simons modified gravity. We have tested some general forms of the scale factor , and use…
A stable flat entropy-corrected FRW universe
Nasr Ahmed, Sultan Z. Alamri
In this paper, a general entropy-corrected FRW cosmological model has been presented in which a deceleration-to-acceleration transition occurs according to recent observations. We…
A stable flat universe with variable Cosmological constant in f(R,T) Gravity
Nasr Ahmed, Sultan Z. Alamri
In this paper, a general FRW cosmological model has been constructed in gravity reconstruction with variable cosmological constant. A number of solutions to the field equa…
Topological Origin of Holographic Principle: Application to wormholes
Nasr Ahmed, Hisham Rafat
In this paper, we suggest a mathematical representation to the holographic principle through the theory topological retracts. We found that the topological retraction is the mathem…
Approximate Analytical Solutions to the Relativistic Isothermal Gas Spheres
A. S. Saad, M. I. Nouh, A. A. Shaker +1
In this paper, we introduce a novel analytical solution to Tolman-Oppenheimer-Volkoff (TOV) equation, which is ultimately a hydrostatic equilibrium equation derived from the genera…
Fluid sphere: stability problem and dimensional constraint
Farook Rahaman, Anirudh Pradhan, Nasr Ahmed +3
We study different dimensional fluids inspired by noncommutative geometry which admit conformal Killing vectors. The solutions of the Einstein field equations examined specifically…
Nonommutative wormholes in gravity
Mubasher Jamil, Farook Rahaman, Ratbay Myrzakulov +3
This paper discusses several new exact solutions of static wormholes in gravity with a noncommutative-geometry background, which replaces point-like structures by smeared ob…
Temperature Fluctuation and an Expected Limit of Hubble Parameter in the Self-Consistent Model
A. B. Morcos
The temperature gradient of microwave background radiation (CMBR) is calculated in the Self Consistent Model. An expected values for Hubble parameter have been presented in two dif…