Impact of f (G, T) and f (R, G) on gravitational baryogenesis and observational bounds

The matter-antimatter asymmetry through baryogenesis (and generalized baryogenesis interaction) mechanism for well-known models of f (R, G) gravity (where R, G represent the Ricci scalar curvature and Gauss-Bonnet topological invariant) and f (G, T) (T denotes the trace of the energy momentum tensor) is being examined. This mechanism is based on the charge-parity (CP) violating interaction between the derivative of the Ricci scalar curvature and the baryon matter current, proposed by Davoudiasl et al. (2004). It is found that baryon to entropy ratio for f (G, T) gravity (specific models: f (G, T) = delta G(m) + lambda T and f (G, T) = delta G(m) + T + epsilon T-2), lies in the range 6.5(-2.5)(+2.5) x 10(-11) and 4(-5)(+5) x 10(-11). For f (R, G) (f (R, G) = k(1)R + k(2)R(n)G(m) and f (R, G) = f(0)R + f(1) root G) models, we also obtain the values of baryon to entropy ratio which are very close to observational data 9x10(-11). It is also mentioned here that results of general form of baryogenesis are also consistent with observational bounds for three models of modified theories of gravity. (C) 2021 Published by Elsevier B.V.

Automated summary

The matter-antimatter asymmetry through baryogenesis mechanism in different gravity models with generalized baryogenesis interaction is being examined, and the baryon to entropy ratios in different models are found to be consistent with observational data.