Leptogenesis During an Era of Early SU(2) Confinement
Abstract
We explore leptogenesis during a cosmological epoch during which the electroweak force is confined. During weak confinement, there is only one conserved non-anomalous global charge, , which is a linear combination of lepton-number, baryon-number, and hypercharge. The inclusion of heavy Majorana neutrinos leads to an -charge and -violating interaction, allowing for the generation of an -charge asymmetry, which translates into a baryon asymmetry post deconfinement. Determining the resulting baryon asymmetry as a function of the model parameters, we find that the predicted baryon-asymmetry can match observations for a wide swath of parameter space. While leptogenesis under the assumption of a standard cosmology relies on the complex phase of the neutrino Yukawa couplings, the asymmetry generated in this novel background cosmology primarily depends on a strong phase from confinement and favors negligible -violation in the right-handed neutrino decays.
Keywords
Cite
@article{arxiv.2503.09723,
title = {Leptogenesis During an Era of Early SU(2) Confinement},
author = {India Bhalla-Ladd and Izzy Ginnett and Tim M. P. Tait},
journal= {arXiv preprint arXiv:2503.09723},
year = {2025}
}