Parameter estimation from improved measurements of the cosmic microwave background from QUaD

S. Gupta, P. Ade, J. Bock, M. Bowden, M. L. Brown, G. Cahill, P. G. Castro, S. Church, T. Culverhouse, R. B. Friedman, K. Ganga, W. K. Gear, J. Hinderks, J. Kovac, A. E. Lange, E. Leitch, S. J. Melhuish, Y. Memari, J. A. Murphy, A. OrlandoC. O'Sullivan, L. Piccirillo, C. Pryke, N. Rajguru, B. Rusholme, R. Schwarz, A. N. Taylor, K. L. Thompson, A. H. Turner, E. Y.S. Wu, A. M. Zemcov

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We evaluate the contribution of cosmic microwave background (CMB) polarization spectra to cosmological parameter constraints. We produce cosmological parameters using high-quality CMB polarization data from the ground-based QUaD experiment and demonstrate for the majority of parameters that there is significant improvement on the constraints obtained from satellite CMB polarization data. We split a multi-experiment CMB data set into temperature and polarization subsets and show that the best-fit confidence regions for the ΛCDM six-parameter cosmological model are consistent with each other, and that polarization data reduces the confidence regions on all parameters. We provide the best limits on parameters from QUaD EE/BB polarization data and we find best-fit parameters from the multi-experiment CMB data set using the optimal pivot scale of kp = 0.013 Mpc-1 to be {h 2Ωc, h 2Ωb, H 0, As , ns , τ} = {0.113, 0.0224, 70.6, 2.29 × 10-9, 0.960, 0.086}.

Original languageEnglish (US)
Pages (from-to)1040-1046
Number of pages7
JournalAstrophysical Journal
Volume716
Issue number2
DOIs
StatePublished - 2010

Keywords

  • Cosmic background radiation
  • Cosmological parameters

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