Statistical description of an ensemble of ultrarelativistic particles in a spatially flat universe

Details Statistical description of an ensemble of ultrarelativistic particles in a spatially flat universe Statistical description of an ensemble of ultrarelativistic particles in a spatially flat universe

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989svphj..32..391i&link_type=abstract

Soviet Physics Journal, Volume 32, Issue 5, pp.391-395

Physics

Scientific paper

The kinetic equation for massless particles in an unperturbed Friedman universe with gravitational interactions taken into account is obtained by averaging the collisionless kinetic equations over local background gravitational field fluctuations. Uniformly distributed spherically symmetric fluctuations of an ultrarelativistic fluid serve as local inhomogeneities in a spatially flat universe. It is shown that the collision integral of our kinetic equation does not vanish when the distribution function is homogeneous and isotropic.

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