Out-of-the-box baryogenesis during relaxation

Abel, S. A.; Gupta, R. S.; Scholtz, J.

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.

Citation

Abel, S., Gupta, R., & Scholtz, J. (2019). Out-of-the-box baryogenesis during relaxation. Physical Review D, 100, Article 015034. https://doi.org/10.1103/physrevd.100.015034

• Journal Article Type: Article
• Online Publication Date: Jul 19, 2019
• Publication Date: Jul 19, 2019
• Deposit Date: Jul 25, 2019
• Publicly Available Date: Jul 25, 2019
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 100
• Article Number: 015034
• DOI: https://doi.org/10.1103/physrevd.100.015034
• Public URL: https://durham-repository.worktribe.com/output/1297138