Zeldovich approximation

Zeldovich approximation is a method in cosmology and astrophysics for describing the nonlinear evolution of the large-scale structure of the universe, particularly the formation of galaxies and clusters from initial density perturbations. It was introduced by Yakov Zeldovich in 1970. The approximation provides a relatively simple way to model the growth of structure in the early universe, bridging the gap between linear theory and fully nonlinear simulations.

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