On the EFT of Large Scale Structures in Redshift Space

Abstract

We further develop the description of redshift space distortions within the Effective Field Theory of Large Scale Structures. First, we generalize the counterterms to include the effect of baryonic physics and primordial non-Gaussianity. Second, we evaluate the IR-resummation of the dark matter power spectrum in redshift space. This requires us to identify a controlled approximation that makes the numerical evaluation straightforward and efficient. Third, we compare the predictions of the theory at one loop with the power spectrum from numerical simulations up to $\ell =6$. We find that the IR-resummation allows us to correctly reproduce the BAO peak. The $k$-reach, or equivalently the precision for a given $k$, depends on additional counterterms that need to be matched to simulations. Since the non-linear scale for the velocity is expected to be longer than the one for the overdensity, we consider a minimal and a non-minimal set of counterterms. The quality of our numerical data makes it hard to firmly establish the performance of the theory at high wavenumbers. Within this limitation, we find that the theory at redshift $z=0.56$ and up to $\ell =2$ matches the data to percent level approximately up to $k\sim 0.13h\mathrm{Mp}{\mathrm{c}}^{-1}$ or $k\sim 0.18h\mathrm{Mp}{\mathrm{c}}^{-1}$, depending on the number of counterterms used, with potentially large improvement over former analytical techniques.

34 pages, 10 figures; v2: minor typos fixed; v3: 35 pages, minor corrections, PRD version

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