Primordial Irregularities in an Early Universe with Vacuum Phase Transitions

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Abstract
In an early universe with second-order or weakly first-order vacuum phase transitions which are associated with spontaneous symmetry breakdown in grand unified gauge thories, the evolution of primordial irregularities is considered. First the linear behavior of various perturbations in an isotropic and homogeneous model is treated and next the inhomogeneous models for an early universe are approximately derived and examined. It is shown that their evolution at this stage can be remarkably fast in the direction of homogenization and isotropization.

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