Power spectrum of the SDSS luminous red galaxies: constraints on cosmological parameters

Abstract

In this paper we determine the constraints on cosmological parameters using the CMB data from the WMAP experiment together with the recent power spectrum measurement of the SDSS Luminous Red Galaxies (LRGs). Specifically, we focus on spatially flat, low matter density models with adiabatic Gaussian initial conditions. The spatial flatness is achieved with an additional quintessence component whose equation of state parameter w_eff is taken to be independent of redshift. Throughout most of the paper we do not allow any massive neutrino contribution and also the influence of the gravitational waves on the CMB is taken to be negligible. The analysis is carried out separately for two cases: (i) using the acoustic scale measurements as presented in Hütsi (2006), (ii) using the full SDSS LRG power spectrum and its covariance matrix. We are able to obtain a very tight constraint on the Hubble constant: H_0 = 70.8 ^{+2.1}_{-2.0} km/s/Mpc, which helps in breaking several degeneracies between the parameters and allows us to determine the low redshift expansion law with much higher accuracy than available from the WMAP + HST data alone. The positive deceleration parameter q_0 is found to be ruled out at 5.5 σconfidence level. Finally, we extend our analysis by investigating the effects of relaxing the assumption of spatial flatness and also allow for a contribution from massive neutrinos.

Final version accepted in A&A, added analysis for the models with massive neutrinos and non-flat spatial geometries

References in corpus (2)

• Massive neutrinos and cosmology
• Limit on the Neutrino Mass from the WMAP Three Year Data

Cited by in corpus (15)

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• Modeling scale-dependent bias on the baryonic acoustic scale with the statistics of peaks of Gaussian random fields
• Clustering of luminous red galaxies I: large scale redshift space distortions
• Tracing The Sound Horizon Scale With Photometric Redshift Surveys
• SPACE: the SPectroscopic All-sky Cosmic Explorer
• First Cosmological Constraints on Dark Energy from the Radial Baryon Acoustic Scale
• Galaxy filaments as pearl necklaces
• Constraint on the cosmological f(R) model from the multipole power spectrum of the SDSS luminous red galaxy sample and prospects for a future redshift survey
• Luminous Red Galaxies in hierarchical cosmologies
• Power Spectrum Shape from Peculiar Velocity Data
• Constraining dark energy via baryon acoustic oscillations in the (an)isotropic light-cone power spectrum
• Confronting the damping of the baryon acoustic oscillations with observation