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First results from the Very Small Array -- IV. Cosmological parameter estimation

Jose Alberto Rubino-Martin, Rafael Rebolo, Pedro Carreira, Kieran Cleary, Rod D. Davies, Richard J. Davis, Clive Dickinson, Keith Grainge, Carlos M. Gutierrez, Michael P. Hobson, Michael E. Jones, Rudiger Kneissl, Anthony Lasenby, Klaus Maisinger, Carolina Oedman, Guy G. Pooley, Pedro J. Sosa Molina, Ben Rusholme, Richard D. E. Saunders, Richard Savage, Paul F. Scott, Anze Slosar, Angela C. Taylor, David Titterington, Elizabeth Waldram, Robert A. Watson, Althea Wilkinson

astro-pharXiv:astro-ph/0205367

Abstract

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 < H0 < 90 km/s/Mpc and 0 < tau < 0.5 we find that the VSA and COBEDMR data alone produce the constraints Omegatot = 1.03+0.12-0.12, Omegabh2 = 0.029+0.009-0.009, Omegacdm h2 = 0.13+0.08-0.05 and ns = 1.04+0.11-0.08 at the 68 per cent confidence level. Adding in the type Ia supernovae constraints, we additionally find Omegam = 0.32+0.09-0.06 and OmegaLambda = 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 H0 (for which the X-ray plus Sunyaev--Zel'dovich route gives a similar result), we obtain the tight constraints Omegam=0.28+0.14-0.07 and OmegaLambda= 0.72+0.07-0.13, which are consistent with, but independent of, those obtained using the supernovae data.

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