Accelerating universe with variable EoS parameter of dark energy in Brans–Dicke theory of gravitation
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Astrophysics and Astronomy"
DOI: 10.1007/s12036-019-9589-y
Abstract: We have investigated the spatially homogeneous and isotropic Friedmann–Robertson–Walker (FRW) universe filled with barotropic fluid and dark energy in the framework of the Brans–Dicke theory of gravitation. Here we have discussed three models: (i) law… read more here.
Keywords: dicke theory; brans dicke; dark energy; theory gravitation ... See more keywords
Anisotropic stars in Brans-Dicke gravity
Sign Up to like & getrecommendations! Published in 2021 at "Chinese Journal of Physics"
DOI: 10.1016/j.cjph.2021.03.019
Abstract: Abstract In the present work we show application of Brans-Dicke theory of gravitation, as an alternative to Einstein’s general relativity, in modeling anisotropic compact stellar objects. To make the field equations solvable we consider the… read more here.
Keywords: anisotropic stars; dicke gravity; brans dicke; stars brans ... See more keywords
Higher dimensional Bianchi type-III string cosmological models with dark energy in Brans-Dicke scalar-tensor theory of gravitation
Sign Up to like & getrecommendations! Published in 2021 at "New Astronomy"
DOI: 10.1016/j.newast.2021.101658
Abstract: Abstract The Five dimensional anisotropic Bianchi type-III cosmological model has been investigated within the framework of Brans-Dicke (Phys. Rev. 124:925, 1961) scalar-tensor theory of gravitation. Dark Energy fluid and cosmic strings are considered as a… read more here.
Keywords: bianchi type; scalar tensor; model; energy ... See more keywords
Cosmological solution through gravitational decoupling in Brans-Dicke gravity
Sign Up to like & getrecommendations! Published in 2021 at "Physica Scripta"
DOI: 10.1088/1402-4896/abe00e
Abstract: In this paper, we compute an anisotropic cosmological solution through a minimal geometric deformation on a non-static spherical spacetime in the framework of self-interacting Brans-Dicke theory. The transformation of the radial component decouples the field… read more here.
Keywords: decoupling brans; solution gravitational; brans dicke; gravitational decoupling ... See more keywords
Thermodynamics of brans-dicke-BTZ black holes coupled to conformal-invariant electrodynamics
Sign Up to like & getrecommendations! Published in 2023 at "Progress of Theoretical and Experimental Physics"
DOI: 10.1093/ptep/ptad053
Abstract: The field equations of Brans-Dicke-conformal-invariant theory in (2+1)-dimensions are highly nonlinear and difficult for direct solving. They are related to those of Einstein-dilaton theory, where the solutions can be obtained easily, by use of a mathematical… read more here.
Keywords: theory; thermodynamics; electrodynamics; brans dicke ... See more keywords
Brans-Dicke scalar field cosmological model in Lyra’s geometry
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.100.023503
Abstract: In this paper, we have developed a new cosmological model in Einstein’s modified gravity theory using two types of modification: (i) Geometrical modification, in which we have used Lyra’s geometry in the left-hand side of the… read more here.
Keywords: cosmological model; field; lyra geometry; geometry ... See more keywords
Wyman’s other scalar field solution, Sultana’s generalization, and their Brans-Dicke andR2relatives
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.100.064017
Abstract: Wyman's less known static and spherically symmetric solution of the Einstein-Klein-Gordon equations and its recent generalization for positive cosmological constant are discussed, showing that they contain central naked singularities. By mapping back to the Jordan… read more here.
Keywords: brans dicke; generalization; scalar field; wyman scalar ... See more keywords
Testing gravity on cosmic scales: A case study of Jordan-Brans-Dicke theory
Sign Up to like & getrecommendations! Published in 2022 at "Physical Review D"
DOI: 10.1103/physrevd.105.043522
Abstract: We provide an end-to-end exploration of a distinct modified gravitational theory in Jordan-Brans-Dicke (JBD) gravity, from an analytical and numerical description of the background expansion and linear perturbations, to the nonlinear regime captured with a… read more here.
Keywords: jordan brans; testing gravity; gravity cosmic; gravity ... See more keywords
Born-Infeld gravity with a Brans-Dicke scalar
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DOI: 10.1103/physrevd.96.024050
Abstract: Recently proposed Born-Infeld (BI) theories of gravity assume a constant BI parameter (κ). However, no clear consensus exists on the sign and value of κ. Recalling the Brans-Dicke (BD) approach, where a scalar field was… read more here.
Keywords: born infeld; infeld gravity; field; cosmology ... See more keywords
Two new approaches to the anomalous limit of Brans-Dicke theory to Einstein gravity
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.99.064013
Abstract: Contrary to common belief, (electro)vacuum Brans-Dicke gravity does not reduce to general relativity for large Brans-Dicke coupling $\ensuremath{\omega}$, a problem which has never been fully solved. Two new approaches, independent from each other, shed light… read more here.
Keywords: two new; new approaches; limit; ensuremath ... See more keywords
Regular Bouncing Solutions, Energy Conditions, and the Brans—Dicke Theory
Sign Up to like & getrecommendations! Published in 2019 at "JETP Letters"
DOI: 10.1134/s0021364019200013
Abstract: In general, to avoid a singularity in cosmological models involves the introduction of exotic kind of matter fields, for example, a scalar field with negative energy density. In order to have a bouncing solution in… read more here.
Keywords: energy conditions; dicke theory; bouncing solutions; regular bouncing ... See more keywords