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arXiv · 2605.16212

Impact of spectator fields and non-minimal couplings in spontaneous baryogenesis

Mattia Dubbini
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Abstract

We investigate the model of spontaneous baryogenesis, considering two extensions to the background paradigm. Firstly, we introduce a non-minimal coupling between gravity and the inflaton, increasing the effective mass squared of the latter. In this way, the inflaton decays more likely into fermion-antifermion pairs during reheating, through baryon-number violating processes. Accordingly, we obtain an overall baryon asymmetry consistent with cosmological observations. Then, we consider a complex scalar spectator field interacting with the inflaton through a biquadratic coupling and non-minimally with gravity, and analyze the impact in terms of baryon asymmetry production. In this scenario too, the background model results significantly enhanced, but the predicted baryon-to-entropy ratio remains smaller than the experimental data.

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Mattia Dubbini. 2026-05-15. Impact of spectator fields and non-minimal couplings in spontaneous baryogenesis. https://doi.org/10.1142/s0217751x26460085

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