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Baryogenesis in $f(R)$-Theories of Gravity
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abstract
$f(R)$-theories of gravity are reviewed in the context of the so called gravitational baryogenesis. The latter is a mechanism for generating the baryon asymmetry in the Universe, and relies on the coupling between the Ricci scalar curvature $R$ and the baryon current. Gravity Lagrangians of the form ${\cal L}(R)\sim R^n$, where $n$ differs from 1 (the case of the General Relativity) only for tiny deviations of a few percent, are consistent with the current bounds on the observed baryon asymmetry.
Forward citations
Cited by 2 Pith papers
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Baryon asymmetry from higher-order matter contributions in gravity
A T^2-dependent coupling between the derivative of T_mu nu T^mu nu and the baryon current can generate the observed baryon asymmetry in GR and f(R,T^2) gravity, at the cost of fitted parameters.
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Asymmetries from a charged memory-burdened PBH
A parameter-space scan shows that very large curvature-current couplings can fit the baryon asymmetry and dark matter abundance, while the electric charge of the black hole plays no role in the mechanism.
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