Journal
ASTRONOMY & ASTROPHYSICS
Volume 459, Issue 2, Pages 375-U127Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20065377
Keywords
cosmology : cosmological parameters; large-scale structure of Universe; cosmic microwave background
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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 we. 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 Hutsi ( 2006, A&A, 449, 891), ( 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(-2.0)(+2.1) km s(-1) Mpc(-1), 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 sigma confidence 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.
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