2025/03/12 by Bhalla-Ladd, India, Ginnett, Izzy, Tait, Tim M. P. · 1 citation
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)
paper · doi:10.48550/arxiv.2503.09723
We explore leptogenesis during a cosmological epoch during which the electroweak SU(2)L force is confined. During weak confinement, there is only one conserved non-anomalous global charge, r, which is a linear combination of lepton-number, baryon-number, and hypercharge. The inclusion of heavy Majorana neutrinos leads to an r-charge and CP-violating interaction, allowing for the generation of an r-charge asymmetry, which translates into a baryon asymmetry post SU(2)L 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 SU(2)L confinement and favors negligible CP-violation in the right-handed neutrino decays.