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Title:
Cosmological Parameters from the QUAD CMB Polarization Experiment
Authors:
Castro, P. G.; Ade, P.; Bock, J.; Bowden, M.; Brown, M. L.; Cahill, G.; Church, S.; Culverhouse, T.; Friedman, R. B.; Ganga, K.; Gear, W. K.; Gupta, S.; Hinderks, J.; Kovac, J.; Lange, A. E.; Leitch, E.; Melhuish, S. J.; Memari, Y.; Murphy, J. A.; Orlando, A.; Pryke, C.; Schwarz, R.; O'Sullivan, C.; Piccirillo, L.; Rajguru, N.; Rusholme, B.; Taylor, A. N.; Thompson, K. L.; Turner, A. H.; Wu, E. Y. S.; Zemcov, M.; The QUa D collaboration
Affiliation:
AA(Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK ; Current address: CENTRA, Departamento de Física, Edifício Ciência, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal. ), AB(School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK ), AC(Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91109, USA ; California Institute of Technology, Pasadena, CA 91125, USA ), AD(School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK ; Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA ), AE(Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK ; Current address: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 OHE, UK. ), AF(Department of Experimental Physics, National University of Ireland Maynooth, Maynooth, Co. Kildare, Ireland ), AG(Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA ), AH(Kavli Institute for Cosmological Physics, Department of Astronomy & Astrophysics, Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA ), AI(Kavli Institute for Cosmological Physics, Department of Astronomy & Astrophysics, Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA ), AJ(APC UMR 7164 (Univ. Paris Diderot-Paris 7 - CNRS - CEA - Obs. de Paris), 10, rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France ), AK(School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK ), AL(School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK ), AM(Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA ; Current address: NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA. ), AN(California Institute of Technology, Pasadena, CA 91125, USA ), AO(California Institute of Technology, Pasadena, CA 91125, USA ), AP(Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91109, USA ; California Institute of Technology, Pasadena, CA 91125, USA ), AQ(School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK ), AR(Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK ), AS(Department of Experimental Physics, National University of Ireland Maynooth, Maynooth, Co. Kildare, Ireland ), AT(School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK ; California Institute of Technology, Pasadena, CA 91125, USA ), AU(Kavli Institute for Cosmological Physics, Department of Astronomy & Astrophysics, Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA ), AV(Kavli Institute for Cosmological Physics, Department of Astronomy & Astrophysics, Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA ), AW(Department of Experimental Physics, National University of Ireland Maynooth, Maynooth, Co. Kildare, Ireland ), AX(School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK ), AY(School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK ; Current address: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK. ), AZ(Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA ; Current address: Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA.), BA(Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK ), BB(Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA ), BC(School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK ), BD(Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA ), BE(School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK ; Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91109, USA ; California Institute of Technology, Pasadena, CA 91125, USA ), BF()
Publication:
The Astrophysical Journal, Volume 701, Issue 2, pp. 857-864 (2009). (ApJ Homepage)
Publication Date:
08/2009
Origin:
IOP
ApJ Keywords:
cosmic microwave background, cosmological parameters, methods: statistical, polarization
DOI:
10.1088/0004-637X/701/2/857
Bibliographic Code:
2009ApJ...701..857C

Abstract

In this paper, we present a parameter estimation analysis of the polarization and temperature power spectra from the second and third season of observations with the QUaD experiment. QUaD has for the first time detected multiple acoustic peaks in the E-mode polarization spectrum with high significance. Although QUaD-only parameter constraints are not competitive with previous results for the standard six-parameter ΛCDM cosmology, they do allow meaningful polarization-only parameter analyses for the first time. In a standard six-parameter ΛCDM analysis, we find the QUaD TT power spectrum to be in good agreement with previous results. However, the QUaD polarization data show some tension with ΛCDM. The origin of this 1σ-2σ tension remains unclear, and may point to new physics, residual systematics, or simple random chance. We also combine QUaD with the five-year WMAP data set and the SDSS luminous red galaxies 4th data release power spectrum, and extend our analysis to constrain individual isocurvature mode fractions, constraining cold dark matter density, αcdmi < 0.11 (95% confidence limit (CL)), neutrino density, αndi < 0.26 (95% CL), and neutrino velocity, αnvi < 0.23 (95% CL), modes. Our analysis sets a benchmark for future polarization experiments.
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