Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Alnadhief H. A. Alfedeel"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 9, Pp 1-13 (2024)
Abstract This paper delves into the late-time accelerated expansion of the universe and the evolution of cosmic structures within the context of a specific $$ f(R, L_m) $$ f ( R , L m ) gravity model, formulated as $$ f(R, L_m) = \lambda R + \beta L_
Externí odkaz:
https://doaj.org/article/728bf2729b6946ada605632eb147e6a6
Autor:
Değer Sofuoğlu, Rishi Kumar Tiwari, Amare Abebe, Alnadhief H. A. Alfedeel, Eltegani I. Hassan
Publikováno v:
Physics, Vol 4, Iss 4, Pp 1348-1358 (2022)
A non-minimally coupled cosmological scenario is considered in the context of f(R,T)=f1(R)+f2(R)f3(T) gravity (with R being the Ricci scalar and T the trace of the energy-momentum tensor) in the background of the flat Friedmann–Robertson–Walker (
Externí odkaz:
https://doaj.org/article/854c4328fd1748a0978e96910cfff00c
Autor:
Rishi Kumar Tiwari, Alnadhief H. A. Alfedeel, Değer Sofuoğlu, Amare Abebe, Eltegani I. Hassan, B. K. Shukla
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
In this paper, we investigate Bianchi type − V cosmological models with bulk viscous fluid and time varying cosmological Λ and Newtonian G parameters. The Einstein’s field equations have been transformed into a coupling non-linear, first-order d
Externí odkaz:
https://doaj.org/article/8cb3f9b4fc12427d801acdf02f2027df
Autor:
Svetlin G. Georgiev, A. Boukarou, Keltoum Bouhali, Khaled Zennir, Hatim M. Elkhair, Eltegani I. Hassan, Alnadhief H. A. Alfedeel, Almonther Alarfaj
Publikováno v:
Symmetry, Vol 15, Iss 6, p 1159 (2023)
In this article, we investigate the generalized Kawahara–KdV system. A new topological approach is applied to prove the existence of at least one classical solution and at least two non-negative classical solutions. The arguments are based upon rec
Externí odkaz:
https://doaj.org/article/a838d9dcb8c7476495c1298975b96ed3
Autor:
Alnadhief H. A. Alfedeel
Publikováno v:
Universe, Vol 9, Iss 6, p 255 (2023)
Using an open thermodynamic systems theory, the effect of particle creation on the evolution and dynamics of the standard cosmological FLRW model in a higher-dimensional spacetime with functionally dependent cosmological and gravitational constants
Externí odkaz:
https://doaj.org/article/e4592428300546a09a2b231455b86ba3
Autor:
Mohamed Karek, Sadok Otmani, Keltoum Bouhali, Khaled Zennir, Hatim M. Elkhair, Eltegani I. Hassan, Alnadhief H. A. Alfedeel, Almonther Alarfaj
Publikováno v:
Axioms, Vol 12, Iss 5, p 444 (2023)
This article is devoted to a study of the question of existence (in time) of weak solutions and the derivation of qualitative properties of such solutions for the nonlinear viscoelastic wave equation with variable exponents and minor damping terms. B
Externí odkaz:
https://doaj.org/article/5ddd360dd3fd4e2daf7bcc4d5323234e
Publikováno v:
Frontiers in Physics, Vol 10 (2022)
The dynamics of the scalar field and particle in a conformal frame are considered. The conformal Klein-Gordon equation describing the scalar field is transformed into the quantum Telegraph equation in Minkowski space-time. The conformal factor acts l
Externí odkaz:
https://doaj.org/article/9bd0a3f8e0034127a7906c04f8b849ce
Autor:
Amare Abebe, Alnadhief H. A. Alfedeel, Değer Sofuoğlu, Eltegani I. Hassan, Rishi Kumar Tiwari
Publikováno v:
Universe, Vol 9, Iss 2, p 61 (2023)
As a follow-up of a recent article in which we investigated the cosmological background expansion history of the universe in Bianchi type-V cosmological models with bulk viscous fluid and evolving cosmological Λ and Newtonian G parameters, we study
Externí odkaz:
https://doaj.org/article/c507454fd0c248b49b67d61bcc237c63
Publikováno v:
Universe, Vol 4, Iss 8, p 83 (2018)
We study the homogeneous but anisotropic Bianchi type-V cosmological model with time-dependent gravitational and cosmological “constants”. Exact solutions of the Einstein field equations (EFEs) are presented in terms of adjustable parameters of q
Externí odkaz:
https://doaj.org/article/0a8c61eb0203454b9ef5416aef662e42
Autor:
Alnadhief H. A. Alfedeel, Amare Abebe
Publikováno v:
Open Astronomy. 31:198-204
In this work, cosmological solutions based on the time-dependent cosmological ( Λ \Lambda ) and Newtonian ( G G ) running “constants” in the Bianchi type-I spacetime are investigated vis-à-vis known cosmological data. The observationally known
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3c0ad551312e543e749e8a545bebea7
https://doi.org/10.1515/astro-2022-0027
https://doi.org/10.1515/astro-2022-0027