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Cosmological Solutions from a Multi-Measure Model with Inflaton Field

Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Tsarigradsko Shosse 72, Sofia 1784, Bulgaria
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These authors contributed equally to this work.
Symmetry 2019, 11(11), 1387; https://doi.org/10.3390/sym11111387
Received: 8 October 2019 / Revised: 28 October 2019 / Accepted: 6 November 2019 / Published: 8 November 2019
(This article belongs to the Special Issue Global and Local Scale Symmetry in Gravitation and Cosmology)
In a recent work, we demonstrated that a modified gravity model in which a scalar “darkon” field is coupled to both the standard Riemannian metric and to another non-Riemannian volume form is compatible with observational data from Supernovae Type Ia. Here, we investigate a more complicated model with an additional “inflaton” scalar field. We demonstrate numerically that the model can qualitatively reproduce the Universe inflation epoch, matter dominated epoch, and present accelerating expansion in a seamless way. We show that such solutions occur only when the model parameters are within a very particular range. The main numerical problem we are faced with is reproducing the extremely small time of the inflation epoch. Here, we present how the variation of some parameters affects this time. View Full-Text
Keywords: multi-measure model; inflation; dark energy and dark matter multi-measure model; inflation; dark energy and dark matter
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Staicova, D.; Stoilov, M. Cosmological Solutions from a Multi-Measure Model with Inflaton Field. Symmetry 2019, 11, 1387.

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