Parameter constraints for flat cosmologies from cosmic microwave background and 2dFGRS power spectra

By Will J. Percival, W. Sutherland, J. Peacock, C. Baugh, Joss Bland-Hawthorn, T. Bridges, R. Cannon, Shaun Cole, M. Colless, C. Collins and 17 more. 2002

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We constrain flat cosmological models with a joint likelihood analysis of a new compilation of data from the cosmic microwave background (CMB) and from the 2dF Galaxy Redshift Survey (2dFGRS). Fitting the CMB alone yields a known degeneracy between the Hubble constant h and the matter density Omega(m), which arises mainly from preserving the location of the peaks in the angular power spectrum. This 'horizon-angle degeneracy' is considered in some detail and is shown to follow the simple relation Omega(m) h(3.4) = constant. Adding the 2dFGRS power spectrum constrains Omega(m) h and breaks the degeneracy. If tensor anisotropies are assumed to be negligible, we obtain values for the Hubble constant of h = 0.665 +/- 0.047, the matter density Omega(m) = 0.313 +/- 0.055, and the physical cold dark matter and baryon densities Omega(c)h(2) = 0.115 +/- 0.009, Omega(b)h(2) = 0.022 +/- 0.002 (standard rms errors). Including a possible tensor component causes very little change to these figures; we set an upper limit to the tensor-to-scalar ratio of r < 0.7 at a 95 per cent confidence level. We then show how these data can be used to constrain the equation of state of the vacuum, and find w < -0.52 at 95 per cent confidence. The preferred cosmological model is thus very well specified, and we discuss the precision with which future CMB data can be predicted, given the model assumptions. The 2dFGRS power-spectrum data and covariance matrix, and the CMB data compilation used here, are available from http://www.roe.ac.uk/similar towjp/.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b74b112027c2aaa045c132ca92eec30bd4896fcf

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Citations in the corpus

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The 2dF-SDSS LRG and QSO Survey: the LRG 2-point correlation function and redshift-space distortions (2006, methodology): “The first uses the cosmological parameters derived from Wilkinson Microwave Anisotropy Probe, 2dFGRS and other data (Percival et al. 2002; Spergel et al. 2003; Cole et al. 2005; Sánchez et al. 2006; Spergel et al. 2007) with ( m, ) = (0.3, 0.7), which we will call the cosmology.”
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The Luminosity and Color Dependence of the Galaxy Correlation Function (2004, methodology): “…parameters are in good agreement with joint analyses of cosmic microwave background (CMB) anisotropies and the 2dFGRS or SDSS galaxy power spectrum (Percival et al. 2002; Spergel et al. 2003; Tegmark et al. 2004b) or with amore recent analysis that incorporates constraints from the SDSS Ly forest…”
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