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When cosmologists study the universe they usually assume it is homogeneous and isotropic with linear perturbations. On large scales this turns out to be a very good approximation. Fortunately, these assumptions greatly simplify the math since:
The equations are linear and therefore easily solvable.
(Related to #1.) Fourier modes decouple meaning you can solve for each mode independent of the
... Read more »
Daniel Baumann, Alberto Nicolis, Leonardo Senatore, & Matias Zaldarriaga. (2010) Cosmological Non-Linearities as an Effective Fluid. eprint. arXiv: 1004.2488v1
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