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Kinetic equations for ultrarelativistic particles with due account ofgravitational interactions with massive particles in the Robertson-Walkeruniverse are obtained. On the basis of an exact solution of the kineticequations thus obtained, a conclusion is made as to the high degree of theuniformity of the relict radiation on scales with are less than $10'$.

Kinetic equations for ultrarelativistic particles in a Robertson-Walker Universe and isotropization of relict radiation by gravitational interactions