Gauss-Bonnet source of Brans-Dicke scalar field and accelerated expansion of universe
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Date
2024
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
World Scientific Publ Co Pte Ltd
Access Rights
info:eu-repo/semantics/closedAccess
Abstract
In this work, using a different theoretical approach, we study a homogeneous and isotropic cosmological spacetime filled with a perfect fluid. Using the framework of Brans-Dicke (BD) and Gauss-Bonnet (GB) theories and including a scalar potential, we obtain the analytical solution of the field equations and find the field functions and the relevant expansion parameter of the spacetime. We assume that the BD and GB media can interact with each other, and hence that there is an energy transfer between these two components. Using this approach, we assume that the BD scalar field is related to intrinsic properties of the GB medium. We introduced a power-law scalar field phi(t)=phi 0tp and found the appropriate dynamical functions for the different powers p. We found that the expansion rate of spacetime also behaves as a power-law, and the accelerating expansion is always satisfied for this model. We also analyze the stability for physically acceptable critical points for a given scale factor.
Description
Keywords
Brans-Dicke theory, Gauss-Bonnet theory, cosmology, scalar field theory
Journal or Series
Modern Physics Letters A
WoS Q Value
N/A
Scopus Q Value
Q2
Volume
39
Issue
14
