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.
Spontaneous and Gravitational Baryogenesis
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abstract
Some problems of spontaneous and gravitational baryogenesis are discussed. Gravity modification due to the curvature dependent term in gravitational baryogensis scenario is considered. It is shown that the interaction of baryonic fields with the curvature scalar leads to strong instability of the gravitational equations of motion and as a result to noticeable distortion of the standard cosmology.
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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.