Perturbation Theory Reloaded : Toward The Precise Modeling Of The Galaxy Power Spectrum In The High-z Galaxy Survey

Astronomy and Astrophysics – Astronomy

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Scientific paper

We shall show that there exist quasi-nonlinear regions in the k-space, where one can actually model the effect of nonlinearities on the galaxy power spectrum by comparing the large number of N-body simulations with the nonlinear perturbation theory. Especially, we shall show that in the high redshift universe, the nonlinear matter evolution, and nonlinear halo bias are now perfectly modeled within a suffcient range in k-space, by the perturbation theory. And the nonlinear redshift space distortion is also well understood, except for the highly nonlinear Finger of God effect.
D. J. acknowledges support from the Texas Advanced Research Program.

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