Gauss-Bonnet source of Brans-Dicke scalar field and accelerated expansion of universe

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dc.authoridKazici Ciftci, Dilek/0000-0003-4339-1489
dc.contributor.authorCiftci, Dilek Kazici
dc.date.accessioned2024-10-29T17:58:46Z
dc.date.available2024-10-29T17:58:46Z
dc.date.issued2024
dc.departmentTekirdağ Namık Kemal Üniversitesi
dc.description.abstractIn 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.
dc.identifier.doi10.1142/S0217732324500676
dc.identifier.issn0217-7323
dc.identifier.issn1793-6632
dc.identifier.issue14en_US
dc.identifier.scopus2-s2.0-85195024512
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1142/S0217732324500676
dc.identifier.urihttps://hdl.handle.net/20.500.11776/14494
dc.identifier.volume39
dc.identifier.wosWOS:001250590100001
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWorld Scientific Publ Co Pte Ltd
dc.relation.ispartofModern Physics Letters A
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectBrans-Dicke theory
dc.subjectGauss-Bonnet theory
dc.subjectcosmology
dc.subjectscalar field theory
dc.titleGauss-Bonnet source of Brans-Dicke scalar field and accelerated expansion of universe
dc.typeArticle

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