Zobrazeno 1 - 10
of 28
pro vyhledávání: '"G. G. L. Nashed"'
Autor:
G. G. L. Nashed
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 10, Pp 1-17 (2024)
Abstract In this paper, we investigate the time dependent black holes in the frame of Einstein–Gauss–Bonnet theory having two scalar fields and investigate the propagation of the gravitational wave (GW). In the reconstructed models, there often a
Externí odkaz:
https://doaj.org/article/d313c5e87ff5470a8cc09fb443006738
Structure, maximum mass, and stability of compact stars in $$f(\mathcal {Q,T})$$ f ( Q , T ) gravity
Autor:
G. G. L. Nashed, Tiberiu Harko
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 10, Pp 1-19 (2024)
Abstract We investigate the properties of compact objects in the f(Q, T) theory, where $$\mathcal {Q}$$ Q is the non-metricity scalar and $${ \mathcal {T}}$$ T is the trace of the energy–momentum tensor. We derive an interior analytical solution fo
Externí odkaz:
https://doaj.org/article/e22ee6e27bec4ebe9d3da4e42ffceb9d
Autor:
G. G. L. Nashed
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 1, Pp 1-20 (2024)
Abstract The successes of f(R) gravitational theory as a logical extension of Einstein’s theory of general relativity (GR) encourage us to delve deep into this theory and continue our study to attempt to derive an extension of the Schwarzschild bla
Externí odkaz:
https://doaj.org/article/8974f09744f14cf7a33c809364720676
Autor:
G. G. L. Nashed
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 8, Pp 1-20 (2023)
Abstract Many physically inspired general relativity (GR) modifications predict significant deviations in the properties of spacetime surrounding massive neutron stars. Among these modifications is $$f({\mathcal {R}}, {\mathbb {T}})$$ f ( R , T ) , w
Externí odkaz:
https://doaj.org/article/38e8af9787b841989bbe8bd6560cf87c
Autor:
G. G. L. Nashed, Shin’ichi Nojiri
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 1, Pp 1-16 (2023)
Abstract It has been suggested that the Einstein–Gauss–Bonnet theory coupled with a scalar field (EGBS) may allow us to obtain physically viable models of celestial phenomena such that the scalar field effect is active in standard four dimensions
Externí odkaz:
https://doaj.org/article/466afdfb283943d9a72a3dac16634184
Autor:
G. G. L. Nashed, W. El Hanafy
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 8, Pp 1-20 (2022)
Abstract 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 play a crucial role differentiating RT from General Relativity (
Externí odkaz:
https://doaj.org/article/9ea71b62e5dc41aa926c386d0cbc5705
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 6, Pp 1-15 (2021)
Abstract In this paper we shall consider spherically symmetric spacetime solutions describing the interior of stellar compact objects, in the context of higher-order curvature theory of the $${{\mathrm {f(R)}}}$$ f ( R ) type. We shall derive the non
Externí odkaz:
https://doaj.org/article/65cc63ed72a44e14ac9a11822f10987f
Autor:
G. G. L. Nashed, S. Capozziello
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 5, Pp 1-20 (2021)
Abstract We derive a new interior solution for stellar compact objects in $$f\mathcal {(R)}$$ f ( R ) gravity assuming a differential relation to constrain the Ricci curvature scalar. To this aim, we consider specific forms for the radial component o
Externí odkaz:
https://doaj.org/article/262d886e36bc4b169f43bfbaa04fd654
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 12, Pp 1-17 (2020)
Abstract We revisit the neutral (uncharged) solutions that describe Einstein’s clusters with matters in the frame of Weitzenböck geometry. To this end, we use a tetrad field with non-diagonal spherical symmetry which gives vanishing of the off-dia
Externí odkaz:
https://doaj.org/article/f797fd0d1a9447e29bb6ecc074ce258f
Autor:
G. G. L. Nashed, S. Capozziello
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 10, Pp 1-18 (2020)
Abstract In the framework of Teleparallel Gravity, we derive a charged non-vacuum solution for a physically symmetric tetrad field with two unknown functions of radial coordinate. The field equations result in a closed-form adopting particular metric
Externí odkaz:
https://doaj.org/article/4c80d3f965d24f2494fc8fea9fe0231e