Cosmological Solutions from a Multi-Measure Model with Inflaton Field

Abstract

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.

arXiv comment11 pages, 4 figures, new figures and comments added. Final version published in Symmetry

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Cited by in corpus (6)

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• Quintessential Inflation from Lorentzian Slow Roll
• Non-Canonical Volume-Form Formulation of Modified Gravity Theories and Cosmology
• The Scale Factor Potential Approach to Inflation
• Cosmology of fermionic dark energy coupled to curvature
• The role of the slope in the the multi-measure cosmological model