Thermodynamics and kinetics of elementary particles in cosmology
  Several lectures for non-experts on equilibrium and non-equilibrium kinetics
in expanding universe are presented. An establishment of thermal equilibrium in
the ealry universe as well as mechanisms leading to deviations from the
equilibrium are discussed. In the first lecture an elementary introduction to
cosmology is presented. Next, kinetic equation in Friedman-Robertson-Walker
mertric is considered. Properties of its solutions for different types of
particles, in particular, for photons of cosmic microwave background radiation,
neutrinos, and massive particles, which could be cold dark matter ones, are
analyzed. It is shown, in particular, that despite being massless, neutrinos
noticeably deviate from equilibrium. Next the modification of the detailed
balance condition in the case of broken T-invariance is discussed and it is
shown that the standard equilibrium distribution functions remain unchanged.
Possible modification of the standard kinetics in the case of broken CPT and
applications to baryogenesis are considered.
