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Loop cosmological implications of a non-minimally coupled scalar field

Martin Bojowald·Mikhail Kagan
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Abstract

Non-minimal actions with matter represented by a scalar field coupled to gravity are considered in the context of a homogeneous and isotropic universe. The coupling is of the form $-ξ/2 ϕ^2 R$. The possibility of successful inflation is investigated taking into account features of loop cosmology. For that end a conformal transformation is performed. That brings the theory into the standard minimally coupled form (Einstein frame) with some effective field and its potential. Both analytical and numerical estimates show that a negative coupling constant is preferable for successful inflation. Moreover, provided fixed initial conditions, larger $|ξ|$ leads to a greater number of {\em e}-folds. The latter is obtained for a reasonable range of initial conditions and the coupling parameter and indicates a possibility for successful inflation.

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Martin Bojowald, Mikhail Kagan. 2006-06-19. Loop cosmological implications of a non-minimally coupled scalar field. https://doi.org/10.1103/physrevd.74.044033

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