Zobrazeno 1 - 10
of 23 952
pro vyhledávání: '"branş"'
Publikováno v:
Trans. Theor. Math. Phys. (TTMP), vol 1(4), 2024
In solving the Brans-Dicke (BD) equations in the BD theory of gravity, their linear independence is important. This is due to fact that in solving these equations in cosmology, if the number of unknown quantities is equal to the number of independent
Externí odkaz:
http://arxiv.org/abs/2410.13316
Autor:
Bisabr, Yousef
We introduce a theoretical model to alleviate the Hubble tension based on dynamics of a minimally coupled scalar field interacting with both radiation and dark matter in the radiation-dominated era. The model we take up within the Einstein representa
Externí odkaz:
http://arxiv.org/abs/2409.08548
Autor:
Mahmoudi, S., Hendi, S. H.
This paper investigates the generation and properties of gravitational radiation within the framework of Generalized Brans-Dicke (GBD) theory, with a specific emphasis on its manifestation in compact binary systems. The primary focus of this study li
Externí odkaz:
http://arxiv.org/abs/2408.05825
Publikováno v:
Int. J. Theor. Phys. 63, 187 (2024)
We investigated the stability of the chameleon screening mechanism in the Brans-Dicke scalar-tensor model. We define a constraint on the Brans-Dicke parameter $\omega_{BD}^*$ identifying two stability groups, $\omega_{BD}>\omega_{BD}^*$ and $0<\omega
Externí odkaz:
http://arxiv.org/abs/2407.21380
Scalar-tensor gravity, exemplified by Brans-Dicke (BD) gravity, introduces additional scalar polarization modes that contribute scalar radiation alongside tensor modes. We conduct a comprehensive analysis of how gravitational wave generation and prop
Externí odkaz:
http://arxiv.org/abs/2407.12328
The present work deals with a multi-field cosmological model in a spatially flat FLRW space-time geometry. The usual Brans-Dicke(BD) field and another scalar field are minimally coupled to gravity while they interact with each other through the Kinet
Externí odkaz:
http://arxiv.org/abs/2407.06696
Autor:
Nguyen, Hoang Ky, Chauvineau, Bertrand
Publikováno v:
Ukr. J. Phys. 69, No. 7, 478 (2024)
The Brans Class I solution in Brans-Dicke gravity is a staple in the study of gravitational theories beyond General Relativity. Discovered in 1961, it describes the exterior vacuum of a spherical Brans-Dicke star and is characterized by two adjustabl
Externí odkaz:
http://arxiv.org/abs/2406.17771
Autor:
Chauvineau, Bertrand, Nguyen, Hoang Ky
Publikováno v:
Phys. Lett. B 855, 138803 (2024)
We derive the complete expression for the Brans Class I exterior spacetime explicitly in terms of the energy and pressures profiles of a stationary spherisymmetric gravity source. This novel and generic expression is achieved in a parsimonious manner
Externí odkaz:
http://arxiv.org/abs/2404.13887
Publikováno v:
Class. Quantum Grav. 41, 145001 (2024)
In recent years there has been a growing interest in the field of wormhole physics in the presence of the Casimir effect. As this effect provides negative energy density, it can be utilized as an ideal candidate for the exotic matter required for cre
Externí odkaz:
http://arxiv.org/abs/2406.10821
We propose a scenario that can explain the early-time inflation and the late-time dark energy within a unified framework. A scalar potential combining power-law and exponential type in a context of extended Jordan-Brans-Dicke gravity is critically im
Externí odkaz:
http://arxiv.org/abs/2405.13402