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Fluid and scalar field representations in the Brans-Dicke theory: cosmological scenarios

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arxiv 2504.01710 v1 pith:7WURH233 submitted 2025-04-02 gr-qc astro-ph.COhep-th

Fluid and scalar field representations in the Brans-Dicke theory: cosmological scenarios

Tiago H. B. Alves , J\'ulio C. Fabris , Luiz Filipe Guimar\~aes This is my paper
classification gr-qc astro-ph.COhep-th
keywords cosmologicalfieldscalarbrans-dickecorrespondingdeterminedrepresentationsscenarios
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The Brans-Dicke scalar-tensor cosmological models are studied in both Einstein and Jordan frames, using hydrodynamical and self-interacting scalar field representations of the energy-momentum tensor, leading to the same background solutions. The main features of the corresponding cosmological scenarios are determined. In many cases, we identify a transition from decelerated to accelerated regimes. The properties of the self-interacting scalar field, including the corresponding potential, are determined. Finally, some possible realistic configurations are analyzed.

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