First results from the Very Small Array -- IV. Cosmological parameter estimation
摘要
We investigate the constraints on basic cosmological parameters set by the first compact-configuration observations of the Very Small Array (VSA), and other cosmological data sets, in the standard inflationary LambdaCDM model. Using a weak prior 40 < H_0 < 90 km/s/Mpc and 0 < tau < 0.5 we find that the VSA and COBE_DMR data alone produce the constraints Omega_tot = 1.03^{+0.12}_{-0.12}, Omega_bh^2 = 0.029^{+0.009}_{-0.009}, Omega_cdm h^2 = 0.13^{+0.08}_{-0.05} and n_s = 1.04^{+0.11}_{-0.08} at the 68 per cent confidence level. Adding in the type Ia supernovae constraints, we additionally find Omega_m = 0.32^{+0.09}_{-0.06} and Omega_Lambda = 0.71^{+0.07}_{-0.07}. These constraints are consistent with those found by the BOOMERanG, DASI and MAXIMA experiments. We also find that, by combining all the recent CMB experiments and assuming the HST key project limits for H_0 (for which the X-ray plus Sunyaev--Zel'dovich route gives a similar result), we obtain the tight constraints Omega_m=0.28^{+0.14}_{-0.07} and Omega_Lambda= 0.72^{+0.07}_{-0.13}, which are consistent with, but independent of, those obtained using the supernovae data.
引用
@article{arxiv.astro-ph/0205367,
title = {First results from the Very Small Array -- IV. Cosmological parameter estimation},
author = {Jose Alberto Rubino-Martin and Rafael Rebolo and Pedro Carreira and Kieran Cleary and Rod D. Davies and Richard J. Davis and Clive Dickinson and Keith Grainge and Carlos M. Gutierrez and Michael P. Hobson and Michael E. Jones and Rudiger Kneissl and Anthony Lasenby and Klaus Maisinger and Carolina Oedman and Guy G. Pooley and Pedro J. Sosa Molina and Ben Rusholme and Richard D. E. Saunders and Richard Savage and Paul F. Scott and Anze Slosar and Angela C. Taylor and David Titterington and Elizabeth Waldram and Robert A. Watson and Althea Wilkinson},
journal= {arXiv preprint arXiv:astro-ph/0205367},
year = {2009}
}
备注
10 pages, 6 figures, MNRAS in press