Out-of-the-box Baryogenesis During Relaxation

Abstract

We show that spontaneous baryogenesis occurs automatically in relaxion models if the reheating temperature is larger than the weak scale, provided the Standard Model fields are charged under the U(1) of which the relaxion is a pseudo-Nambu-Goldstone boson. During the slow roll, the relaxion breaks CPT, biasing the thermal equilibrium in favor of baryons, with sphalerons providing the necessary baryon number violation. We calculate the resulting baryon asymmetry, explore the possible constraints on this scheme and show that there is a swath of parameter space in which the current observations are matched. Successful baryogenesis can be achieved for a range of relaxion masses between $10^{-10}$ and $10^{-5}$ eV. The mechanism operates precisely in the region of parameter space where recent work has shown relaxion oscillations to be a dark matter candidate.

arXiv comment8 Pages, 2 Figures

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Cited by in corpus (10)

• Relaxion Stars and their detection via Atomic Physics
• Relaxion Fluctuations (Self-stopping Relaxion) and Overview of Relaxion Stopping Mechanisms
• Relaxion Dark Matter
• All-in-one Relaxion, a unified solution to five BSM puzzles
• Freeze-in Axion-like Dark Matter
• High Energy Sphalerons for Baryogenesis at Low Temperatures
• Fast-Rolling Relaxion
• Electroweak baryogenesis by axionlike dark matter
• Gravitational tests of electroweak relaxation
• Mixing Particle Production for Relaxion Mechanism