Big-bang nucleosynthesis and cosmic microwave background constraints on non-minimally coupled theories of gravity

Phys. Rev. D 98, 064045 (2018) In this paper we show that the baryon-to-photon ratio $\eta$ is in general not conserved before decoupling in non-minimally coupled theories of gravity. We use big-bang nucleosynthesis and cosmic microwave background limits on the baryon-to-photon ratio $\eta$ to deriv...

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Bibliographic Details
Main Authors:	Azevedo, R. P. L, Avelino, P. P
Format:	Journal Article
Language:	English
Published:	02-07-2018
Subjects:	Physics - Cosmology and Nongalactic Astrophysics Physics - General Relativity and Quantum Cosmology
Online Access:	Get full text
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Summary:	Phys. Rev. D 98, 064045 (2018) In this paper we show that the baryon-to-photon ratio $\eta$ is in general not conserved before decoupling in non-minimally coupled theories of gravity. We use big-bang nucleosynthesis and cosmic microwave background limits on the baryon-to-photon ratio $\eta$ to derive new constraints on modified gravity theories with a universal non-minimal coupling between matter and curvature, showing that they rule out a specific class of models previously considered in the literature as a substitute for the dark matter. We also compare these new constraints with the ones obtained from the COBE-FIRAS limits on CMB spectral distortions, highlighting the complementarity between them.
DOI:	10.48550/arxiv.1807.00798