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

Abstract

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.

6 pages

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Cited by in corpus (14)

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• Big Bang Nucleosynthesis and Entropy Evolution in $f(R,T)$ Gravity
• Non-minimal geometry-matter couplings in Weyl-Cartan space-times: $f(R,T,Q,T_m)$ gravity
• Lagrangian description of cosmic fluids: mapping dark energy into unified dark energy
• BBN Constraints on $f(Q,T)$ Gravity
• On-shell Lagrangian of an ideal gas
• Particle creation and decay in nonminimally coupled models of gravity
• Distance-duality in theories with a nonminimal coupling to gravity
• The dynamics of three nearby E0 galaxies in refracted gravity
• Non-minimal Higgs inflation within holographic cosmology
• Boltzmann's $H$-theorem, entropy and the strength of gravity in theories with a nonminimal coupling between matter and geometry
• Constrained transit cosmological models in $f(R,L_m,T)$-gravity
• Thermodynamic Behavior of a 4D Nonminimal Maxwell-AdS Black Hole
• Lagrangian Identity and Mass Evolution of Particle-like Objects in Nonminimally Coupled Gravity