Skip to main content

Research Repository

Advanced Search

Out-of-the-box baryogenesis during relaxation

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

Out-of-the-box baryogenesis during relaxation Thumbnail


R. S. Gupta

J. Scholtz


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.


Abel, S., Gupta, R., & Scholtz, J. (2019). Out-of-the-box baryogenesis during relaxation. Physical Review D, 100, Article 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


Published Journal Article (331 Kb)

Publisher Licence URL

Copyright Statement
Published by the American Physical Society under the terms of<br /> the Creative Commons Attribution 4.0 International license.<br /> Further distribution of this work must maintain attribution to<br /> the author(s) and the published article&rsquo;s title, journal citation,<br /> and DOI. Funded by SCOAP3.

You might also like

Downloadable Citations