Dynamical dark energy and spontaneously generated gravity

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Abstract

We study the cosmological evolution of an induced gravity model with a scale symmetry breaking potential for the scalar field and the presence of barotropic fluids. The radiation to matter transition, following inflation and reheating, influences the dynamics of such a field through its non-minimal coupling. Indeed one finds, as a consequence of such a transition, that the scalar field is shifted from the potential minimum (which is associated with a zero cosmological constant). We illustrate how, under certain conditions on the potential, such a dynamics can lead to a suitable amount of dark energy explaining the present accelerated expansion. In such an approach, however, for long enough times, the dark energy will disappear. © 2012 Elsevier B.V.

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Kamenshchik, A. Y., Tronconi, A., & Venturi, G. (2012). Dynamical dark energy and spontaneously generated gravity. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 713(4–5), 358–364. https://doi.org/10.1016/j.physletb.2012.06.035

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