A spectator scalar field coupled to the inflaton and to spacetime curvature yields a first-order correction to the baryon asymmetry in spontaneous baryogenesis, potentially enhancing it by orders of magnitude for small coupling g.
Gravitational baryogenesis in non-minimal kinetic coupling model
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abstract
In this work, we consider the gravitational baryogenesis in the framework of non-minimal derivative coupling model. A mechanism to generate the baryon asymmetry based on the coupling between the derivative of the Ricci scalar curvature and the baryon current in context of non-minimal derivative coupling model is investigated. We show that, in this model, the temperature increases during the reheating periods to the end of reheating period or beginning of radiation dominated era. Therefore the reheating temperature is larger then decoupling temperature. It can be demonstrated that, the evaluation of baryon asymmetry is not depends on coupling constant. In this model we can generate baryon asymmetry at low and high reheating temperature, by considering the high friction constraint.
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gr-qc 1years
2025 1verdicts
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Impact of a complex scalar spectator field on baryon asymmetry within spontaneous baryogenesis
A spectator scalar field coupled to the inflaton and to spacetime curvature yields a first-order correction to the baryon asymmetry in spontaneous baryogenesis, potentially enhancing it by orders of magnitude for small coupling g.