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Baryogenesis During Reheating via the Ratchet Mechanism

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Cosmological Implications of Quantum Anomalies

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Abstract

Another interesting and relatively unorthodox approach to generating the baryon asymmetry of the universe is via the inflaton during the reheating epoch. Unlike the dilution problems associated with inflationary cogenesis considered above, the difficulties with a reheating scenario are related to the high level of uncertainty and complexity of the dynamics associated with the reheating phase. The exact nature of the reheating epoch is mostly unknown, but it is a period dominated by the inflaton dynamics, and as such is strongly related to the properties of the inflaton and inflationary potential. To try to alleviate this issue and for simplicity, we will consider a Starobinsky inflationary scenario, which converges to the usual \( \mu ^2\Phi ^2 \) potential during reheating. We propose a new scenario for Baryogenesis during the reheating epoch that utilises the Ratchet mechanism, a model inspired by molecular motors in biological systems, and their ability to generate directed motion. This is achieved through the correlated behaviour between the inflaton and a complex scalar baryon. If the inflaton and the scalar baryon couple via a derivative coupling, the behaviour of the scalar baryon phase \( \theta \) is found to be analogous to that of the forced pendulum, potentially producing a non-vanishing value of \( \dot{\theta }\) which is necessary to generate a non-zero baryon number density [1]

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  1. Kavli Institute of Physics and Mathematics of the Universe, The University of Tokyo Kashiwa Campus, Kashiwa, Japan

    Neil David Barrie

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Barrie, N.D. (2018). Baryogenesis During Reheating via the Ratchet Mechanism. In: Cosmological Implications of Quantum Anomalies. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-94715-0_4

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