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Modelling redshift space distortions in hierarchical cosmologies.

Jennings, Elise and Baugh, Carlton M. and Pascoli, Silvia (2011) 'Modelling redshift space distortions in hierarchical cosmologies.', Monthly notices of the Royal Astronomical Society., 410 (3). pp. 2081-2094.

Abstract

The anisotropy of clustering in redshift space provides a direct measure of the growth rate of large-scale structure in the Universe. Future galaxy redshift surveys will make high-precision measurements of these distortions, and will potentially allow us to distinguish between different scenarios for the accelerating expansion of the Universe. Accurate predictions are needed in order to distinguish between competing cosmological models. We study the distortions in the redshift space power spectrum in Lambda cold dark matter (ΛCDM) and quintessence dark energy models, using large-volume N-body simulations, and test predictions for the form of the redshift space distortions. We find that the linear perturbation theory prediction is a poor fit to the measured distortions, even on surprisingly large scales k≥ 0.05 h Mpc−1. An improved model for the redshift space power spectrum, including the non-linear velocity divergence power spectrum, is presented and agrees with the power spectra measured from the simulations up to k∼ 0.2 h Mpc−1. We have found a density–velocity relation which is cosmology independent and which relates the non-linear velocity divergence spectrum to the non-linear matter power spectrum. We provide a formula which generates the non-linear velocity divergence P(k) at any redshift, using only the non-linear matter power spectrum and the linear growth factor at the desired redshift. This formula is accurate to better than 5 per cent on scales k < 0.2 h Mpc−1 for all the cosmological models discussed in this paper. Our results will extend the statistical power of future galaxy surveys.

Item Type:Article
Keywords:Methods: numerical, Cosmology: theory, Large-scale structure of Universe.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1111/j.1365-2966.2010.17581.x
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2010 The Authors. Journal compilation © 2010 RAS Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:28 April 2015
Date of first online publication:January 2011
Date first made open access:No date available

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