Particle creation in cosmology.

The quantum effect of particle creation in strong, time-varying gravitational fields is depicted as a possible mechanism for the isotropy of the universe. This effect arises when one considers the quantization of fields (in particular, radiation fields) in curved space-time, i.e., in a background gravitational field. It is shown that particle creation is especially significant near a singularity of the most general type - an anisotropic singularity. Three consequences of particle creation are noted: (1) a rapid isotropization of cosmological expansion after a certain critical moment; (2) smallness of primordial rotational metric perturbations; and (3) the impossibility of long delay of cosmological white hole explosions.