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Late time cosmic acceleration in modified S\'{a}ez-Ballester theory

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arxiv 1911.03901 v2 pith:KFXGK7OK submitted 2019-11-10 gr-qc hep-th

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keywords theoryenergyez-ballesterscalartheoriesframeworkmodifiedmomentum
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We establish an extended version of the modified S\'{a}ez-Ballester (SB) scalar-tensor theory in arbitrary dimensions whose energy momentum tensor as well as potential are pure geometrical quantities. This scenario emerges by means of two scalar fields (one is present in the SB theory and the other is associated with the extra dimension) which widens the scope of the induced-matter theory. Moreover, it bears a close resemblance to the standard S\'{a}ez-Ballester scalar-tensor theory, as well as other alternative theories to general relativity, whose construction includes either a minimally or a non-minimally coupled scalar field. However, contrary to those theories, in our framework the energy momentum tensor and the scalar potential are not added by hand, but instead are dictated from the geometry. Concerning cosmological applications, our herein contribution brings a new perspective. We firstly show that the dark energy sector can be naturally retrieved within a strictly geometric perspective, and we subsequently analyze it. Moreover, our framework may provide a hint to understand the physics of lower gravity theories.

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  1. Anisotropic power-law inflation for the S\'aez-Ballester theory non-minimally coupled to a vector field

    gr-qc 2025-02 conditional novelty 4.0 of 10

    A stable anisotropic inflationary solution exists in the Saez-Ballester theory, but it is equivalent to the known Kanno-Soda-Watanabe solution and has a too-large tensor-to-scalar ratio.

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