Comment about quasi-isotropic solution of Einstein equations near cosmological singularity

Abstract

We generalize for the case of arbitrary hydrodynamical matter the quasi-isotropic solution of Einstein equations near cosmological singularity, found by Lifshitz and Khalatnikov in 1960 for the case of radiation-dominated universe. It is shown that this solution always exists, but dependence of terms in the quasi-isotropic expansion acquires a more complicated form.

7 pages, The collective of authors is enlarged and some comments and references are added

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