### Zel'dovich approximation

(model of the formation of cosmological structure)

The **Zel'dovich approximation** is a model of the
formation of the grand structure of the universe
applying Lagrangian perturbation theory.
It was published in 1970 by Soviet physicist Yakov Zel'dovich, also
known for the Sunyaev-Zel'dovich effect.

**Zel'dovich pancakes** are an ellipsoid/pancake-shaped
high-density volumes which his model produces and he
suggested were seeds of large scale structures such as superclusters.

(*cosmology,CMB*)
http://en.wikipedia.org/wiki/Zeldovich_pancake

http://ned.ipac.caltech.edu/level5/Sept03/Peacock/Peacock3.html

https://fisica.usac.edu.gt/public/curccaf_proc/borganihtml/node4.html

https://arxiv.org/abs/1311.7134

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