Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-09-11
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, Latex with sprocl.sty, no figures; talk given at the Eotvos Conference in Science ,``Strong and Electroweak Matter '9
Scientific paper
Radiation domination at the electroweak epoch is a simplifying assumption, but one for which there is no observational basis. Treating the expansion rate as a variable, I re-examine electroweak baryogenesis in various scenarios. At a first order phase transition the main effect is on the sphaleron bound, which becomes a lower bound on the expansion rate in any given theory. At a second-order or cross-over phase transition, the created baryon asymmetry is directly proportional to the expansion rate. I sketch an alternative post-inflationary cosmology, in which the kinetic energy of a scalar field dominates the Universe until shortly before nucleosynthesis, and argue that the observed baryon asymmetry could be produced in this case even at an analytic cross-over.
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