Particle collisions in an expanding universe

Details Particle collisions in an expanding universe Particle collisions in an expanding universe

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982zhetf..82....3b&link_type=abstract

Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki, vol. 82, Jan. 1982, p. 3-8. In Russian.

Astronomy and Astrophysics

Astronomy

9

Astronomical Models, Big Bang Cosmology, Particle Collisions, Universe, Collision Parameters, Integral Equations, Particle Energy

Scientific paper

A collision integral is derived for particles interacting only gravitationally in a plane expanding universe, described by the Milne-McCrea nonrelativistic solution. This integral does not contain divergences for large impact parameters and small deviation angles. The convergence of the integral is due to the increase of the particle expansion velocity with the impact parameter, and not to Debye screening (as in a plasma). The relaxation time for the Maxwellian distribution is determined.

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