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Cosmological models in Weyl geometrical scalar-tensor theory

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arxiv 1602.06966 v2 pith:23NR6KGI submitted 2016-02-22 gr-qc

M. L. Pucheu , F. A. P. Alves-Junior , A. B. Barreto , C. Romero This is my paper
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keywords cosmologicalscalartheoryfieldgeometricalgeometrymodelspotential
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We investigate cosmological models in a recently proposed geometrical theory of gravity, in which the scalar field appears as part of the space-time geometry. We extend the previous theory to include a scalar potential in the action. We solve the vacuum field equations for different choices of the scalar potential and give a detailed analysis of the solutions. We show that in some cases a cosmological scenario is found that seems to suggest the appearance of a geometric phase transition. We build a toy model, in which the accelerated expansion of the early universe is driven by pure geometry.

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  1. Geometric formulation of $k$-essence and late-time acceleration

    gr-qc 2025-05 conditional novelty 6.0 of 10

    Integrable vectorial nonmetricity gravity is shown to be equivalent to purely kinetic quadratic k-essence, which fits late-time data as well as ΛCDM.

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