Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Alfedeel Alnadhief H. A."'
Autor:
Alfedeel Alnadhief H. A., Abebe Amare
Publikováno v:
Open Astronomy, Vol 31, Iss 1, Pp 198-204 (2022)
In this work, cosmological solutions based on the time-dependent cosmological (Λ\Lambda ) and Newtonian (GG) running “constants” in the Bianchi type-I spacetime are investigated vis-à-vis known cosmological data. The observationally known value
Externí odkaz:
https://doaj.org/article/7520c5b8e8f34a2988810ed862a99528
Autor:
Sahlu, Shambel, Shukla, Bhupendra Kumar, Tiwari, Rishi Kumar, Sofuoğlu, Değer, Alfedeel, Alnadhief H. A.
In this paper, we have studied the late-time accelerating expansion of the Universe using the matter-geometry coupled $ f(Q, T) $ gravity model, where $ Q $ is the non-metricity scalar and $ T $ represents the trace of the energy-momentum tensor. We
Externí odkaz:
http://arxiv.org/abs/2411.04757
Autor:
Alfedeel Alnadhief H. A.
Publikováno v:
Open Astronomy, Vol 29, Iss 1, Pp 89-93 (2020)
In this paper, we have investigated the homogeneous and anisotropic Bianchi type–I cosmological model with a time-varying Newtonian and cosmological constant. We have analytically solved Einstein’s field equations (EFEs) in the presence of a stif
Externí odkaz:
https://doaj.org/article/aef45c90d5ce440a9593f6a1b40bcfda
This paper delves into the late-time accelerated expansion of the universe and the evolution of cosmic structures within the context of a specific \( f(R, L_m) \) gravity model, formulated as \( f(R, L_m) = \lambda R + \beta L_m^\alpha + \eta \). To
Externí odkaz:
http://arxiv.org/abs/2406.08303
In this work, we investigate the bouncing behavior of the universe within the framework of $f(R,L_m)$ gravity, using a simple form of $f(R,L_m)=\frac{R}{2}+L_m^\gamma$ (where $\gamma$ is a free model parameter) as previously studied. The model predic
Externí odkaz:
http://arxiv.org/abs/2403.15772
Publikováno v:
Astron. Comput. 47, 100821 (2024)
In this paper, we investigate the cosmological implications and constraints of Weyl-type $f(Q, T)$ gravity. This theory introduces a coupling between the non-metricity $Q$ and the trace $T$ of the energy-momentum tensor, using the principles of prope
Externí odkaz:
http://arxiv.org/abs/2403.09916
Publikováno v:
Eur. Phys. J. Plus 138, 1030 (2023)
We propose a novel approach to parameterize the equation of state for Scalar Field Dark Energy (SFDE) and use it to derive analytical solutions for various cosmological parameters. Using statistical MCMC with Bayesian techniques, we obtain constraint
Externí odkaz:
http://arxiv.org/abs/2311.03299
In this paper, we investigate the evolution of cosmological perturbations within the context of Bianchi Type$-I$ spacetimes. We consider models containing viscous fluids with evolving cosmological (\LL) and Newtonian gravitational (G) parameters. The
Externí odkaz:
http://arxiv.org/abs/2311.03399
Autor:
Koussour, M., Myrzakulov, N., Alfedeel, Alnadhief H. A., Hassan, E. I., Sofuoğlu, D., Mirgani, Safa M.
This paper is a parametrization of the equation of state (EoS) parameter of dark energy (DE), which is parameterized using Square-Root (SR) form i.e. $\omega _{SR}=\text{$\omega _{0}$}+\text{$\omega _{1}$}\frac{z}{\sqrt{z^{2}+1}}$, where $\omega _{0}
Externí odkaz:
http://arxiv.org/abs/2310.20405
Publikováno v:
Prog. Theor. Exp. Phys. 2023, 113E01 (2023)
Despite the significant accomplishments of general relativity, numerous unresolved issues persist in our understanding of the cosmos. One of the most perplexing challenges is the ongoing accelerated expansion of the Universe, which continues to elude
Externí odkaz:
http://arxiv.org/abs/2310.15067