Baryogenesis in f(P) gravity

Bhattacharjee, Snehasish (2021) Baryogenesis in f(P) gravity. International Journal of Modern Physics A, 36 (27). ISSN 0217-751X

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In this work, we investigate gravitational baryogenesis in the framework of f(P) gravity to understand the applicability of this class of modified gravity in addressing the baryon asymmetry of the universe. For the analysis, we set f(P)=αP, where α is the model parameter. We found that in f(P) gravity, the CP-violating interaction acquires a modification through the addition of the nontopological cubic term P in addition to the Ricci scalar R and the mathematical expression of the baryon-to-entropy ratio depends not only on the time derivative of R but also the time derivative of P. Additionally, we also investigate the consequences of a more complete and generalized CP-violating interaction proportional to f(P) instead of P in addressing the baryon asymmetry of the universe. For this type of interaction, we report that the baryon-to-entropy ratio is proportional to Ṙ, Ṗ and f′(P). We report that for both of these cases, rational values of α generate acceptable baryon-to-entropy ratios compatible with observations.

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Item Type: Article
Uncontrolled Keywords: baryogenesis; Early universe; modified gravity; observational constraints
Subjects: Physics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 08 Aug 2022 04:46
Last Modified: 08 Aug 2022 04:46
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