1992/12/01 by B. A. Campbell, Sacha Davidson, S. Davidson +4 · 6 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1016/0370-2693(92)91079-o
published as Phys.Lett.B297:118-124,1992 · LATEX File with 12 pages, one figure (not included); published in Phys. Lett B297 (1992) p118
openalex publication_date 1992/12/01 · arxiv created 1993/02/05 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Non-perturbative electroweak effects, in thermal equilibrium in the early universe, have the potential to erase the baryon asymmetry of the universe, unless it is encoded in a B-L asymmetry, or in some "accidentally" conserved quantity. We first consider the possibility that the BAU may be regenerated from lepton flavour asymmetries even when initially B-L = 0. We show that provided some, but \it not all the lepton flavours are violated by ΔL≠0 interactions in equilibrium, the BAU may be regenerated without lepton mass effects. We next examine the possibility of encoding the baryon asymmetry in a primordial asymmetry for the right-handed electron, which due to its weak Yukawa interaction only comes into chemical equilibrium as the sphalerons are falling out of equilibrium. This would also raise the possibility of preserving an initial baryon asymmetry when B-L = 0.