Abstract
This chapter discusses various phenomena associated with the electroweak baryon number violation at high temperatures. The most famous relic, the features of visible Universe that were fixed at some earlier stage when the relevant processes were operative—is probably the microwave background reminiscent of the age when the matter was completely ionized and photons interacted effectively with it. The fascinating idea is that the observed asymmetry between numbers of baryons and antibaryons is also a relic, that is, it was not given once and forever but was formed at some time when the baryon number (B) was not conserved. The baryon number nonconservation at high temperatures consists of two parts. The first one concerns the kinetics of B dissipation, the equilibrium B value, the rate, and the statistical foundations. The second, much more uncertain part, deals with structure. The chapter also discusses the fluctuation–dissipation formula, describes the effects introduced by the Universe expansion, and discusses the stability of the three-dimensional theory by adding a small CP-violating source term proportional to the Chern-Simons number.
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