2021/05/31 by Debasish Borah, Arnab Dasgupta, Sin Kyu Kang · 1 citation
Physics and Astronomy · #hep-ph #astro-ph.CO
paper · pdf · doi:10.1103/physrevd.104.063501
published as Phys. Rev. D 104, 063501 (2021) · 9 pages, 5 captioned figures, typo in eq. (1) corrected, matches journal version
arxiv created 2021/09/10 · arxiv updated 2021/09/14
We study a possibility of a strong first-order phase transition (FOPT) taking place below the electroweak scale in the context of U(1)D gauge extension of the standard model. As pointed out recently by the NANOGrav collaboration, gravitational waves from such a phase transition with appropriate strength and nucleation temperature can explain their 12.5 yr data. We first find the parameter space of this minimal model consistent with NANOGrav findings considering only a complex singlet scalar and U(1)D vector boson. Existence of a singlet fermion charged under U(1)D can give rise to dark matter in this model, preferably of non-thermal type, while incorporating additional fields can also generate light neutrino masses through typical low scale seesaw mechanisms like radiative or inverse seesaw.