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Scientific article
English

Distribution function approach to redshift space distortions. Part V: perturbation theory applied to dark matter halos

Published inJournal of cosmology and astroparticle physics, vol. 2013, no. 10, p. 053-053
Publication date2013
Abstract

Numerical simulations show that redshift space distortions (RSD) introduce strong scale dependence in the power spectra of halos, with ten percent deviations relative to linear theory predictions even on relatively large scales (k < 0.1h/Mpc) and even in the absence of satellites (which induce Fingers-of-God, FoG, effects). If unmodeled these effects prevent one from extracting cosmological information from RSD surveys. In this paper we use Eulerian perturbation theory (PT) and Eulerian halo biasing model and apply it to the distribution function approach to RSD, in which RSD is decomposed into several correlators of density weighted velocity moments. We model each of these correlators using PT and compare the results to simulations over a wide range of halo masses and redshifts. We find that with an introduction of a physically motivated halo biasing, and using dark matter power spectra from simulations, we can reproduce the simulation results at a percent level on scales up to k ~ 0.15h/Mpc at z = 0, without the need to have free FoG parameters in the model.

Keywords
  • Power spectrum
  • Cosmological perturbation theory
  • Galaxy clustering
  • Galaxy surveys
Citation (ISO format)
VLAH, Zvonimir et al. Distribution function approach to redshift space distortions. Part V: perturbation theory applied to dark matter halos. In: Journal of cosmology and astroparticle physics, 2013, vol. 2013, n° 10, p. 053–053. doi: 10.1088/1475-7516/2013/10/053
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ISSN of the journal1475-7516
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