The Clustering of Galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Testing Gravity with Redshift Space Distortions using the Power Spectrum Multipoles

Author

Florian Beutler
Shun Saito, Missouri University of Science and TechnologyFollow
For full list of authors, see publisher's website.

Abstract

We analyse the anisotropic clustering of the Baryon Oscillation Spectroscopic Survey (BOSS) CMASS Data Release 11 (DR11) sample, which consists of 690 827 galaxies in the redshift range 0.43 < z < 0.7 and has a sky coverage of 8498 deg². We perform our analysis in Fourier space using a power spectrum estimator suggested by Yamamoto et al. We measure the multipole power spectra in a self-consistent manner for the first time in the sense that we provide a proper way to treat the survey window function and the integral constraint, without the commonly used assumption of an isotropic power spectrum and without the need to split the survey into subregions. The main cosmological signals exploited in our analysis are the baryon acoustic oscillations and the signal of redshift space distortions, both of which are distorted by the Alcock-Paczynski effect. Together, these signals allow us to constrain the distance ratio D_V(z_eff)/r_s(z_d) = 13.89 ± 0.18, the Alcock-Paczynski parameter F_AP(z_eff) = 0.679 ± 0.031 and the growth rate of structure f(z_eff)σ₈(z_eff) = 0.419 ± 0.044 at the effective redshift z_eff = 0.57. We emphasize that our constraints are robust against possible systematic uncertainties. In order to ensure this, we perform a detailed systematics study against CMASS mock galaxy catalogues and N-body simulations. We find that such systematics will lead to 3.1 per cent uncertainty for σ₈ if we limit our fitting range to k = 0.01-0.20 h Mpc^-1, where the statistical uncertainty is expected to be three times larger. We did not find significant systematic uncertainties for D_V/r_s or F_AP. Combining our data set with Planck to test General Relativity (GR) through the simple γ-parametrization, where the growth rate is given by f (z) = Ω^γ_m m(z), reveals a ~2σ tension between the data and the prediction by GR. The tension between our result and GR can be traced back to a tension in the clustering amplitude σ₈ between CMASS and Planck.

Recommended Citation

F. Beutler et al., "The Clustering of Galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Testing Gravity with Redshift Space Distortions using the Power Spectrum Multipoles," Monthly Notices of the Royal Astronomical Society, vol. 443, no. 2, pp. 1065 - 1089, Oxford University Press, Apr 2014.

The definitive version is available at https://doi.org/10.1093/mnras/stu1051

Department(s)

Physics

Keywords and Phrases

Cosmological parameters; Cosmology: observations; Dark energy; Gravitation; Large-scale structure of universe; Surveys

International Standard Serial Number (ISSN)

0035-8711; 1365-2966

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2014 The Authors, All rights reserved.

Publication Date

01 Apr 2014