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

@article{Khalatnikov2002CommentAQ,
  title={Comment about quasi-isotropic solution of Einstein equations near the cosmological singularity},
  author={Isaak M. Khalatnikov and Alexander Yu. Kamenshchik and Alexei A. Starobinsky},
  journal={Classical and Quantum Gravity},
  year={2002},
  volume={19},
  pages={3845-3849}
}
For the case of arbitrary hydrodynamical matter, we generalize the quasi-isotropic solution of Einstein equations near the cosmological singularity, found by Lifshitz and Khalatnikov in 1960 for the case of the 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. 
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