Cosmological Parameters from the QUAD CMB Polarization Experiment
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 significan...
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Published in | The Astrophysical journal Vol. 701; no. 2; pp. 857 - 864 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
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Bristol
IOP Publishing
01.08.2009
IOP American Astronomical Society |
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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 Lambda CDM cosmology, they do allow meaningful polarization-only parameter analyses for the first time. In a standard six-parameter Lambda CDM 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 Lambda CDM. The origin of this 1 sigma -2 sigma 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, alpha cdmi < 0.11 (95% confidence limit (CL)), neutrino density, alpha ndi < 0.26 (95% CL), and neutrino velocity, alpha nvi < 0.23 (95% CL), modes. Our analysis sets a benchmark for future polarization experiments. |
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AbstractList | 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. 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 Lambda CDM cosmology, they do allow meaningful polarization-only parameter analyses for the first time. In a standard six-parameter Lambda CDM 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 Lambda CDM. The origin of this 1 sigma -2 sigma 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, alpha cdmi < 0.11 (95% confidence limit (CL)), neutrino density, alpha ndi < 0.26 (95% CL), and neutrino velocity, alpha nvi < 0.23 (95% CL), modes. Our analysis sets a benchmark for future polarization experiments. 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 LambdaCDM cosmology, they do allow meaningful polarization-only parameter analyses for the first time. In a standard six-parameter LambdaCDM 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 LambdaCDM. The origin of this 1sigma-2sigma 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, alphacdmi < 0.11 (95% confidence limit (CL)), neutrino density, alphandi < 0.26 (95% CL), and neutrino velocity, alphanvi < 0.23 (95% CL), modes. Our analysis sets a benchmark for future polarization experiments. 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 Delta *LCDM cosmology, they do allow meaningful polarization-only parameter analyses for the first time. In a standard six-parameter Delta *LCDM 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 Delta *LCDM. The origin of this 1 Delta *s-2 Delta *s 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, Delta *acdmi < 0.11 (95% confidence limit (CL)), neutrino density, Delta *andi < 0.26 (95% CL), and neutrino velocity, Delta *anvi < 0.23 (95% CL), modes. Our analysis sets a benchmark for future polarization experiments. |
Author | Ade, P Wu, E. Y. S Bock, J Piccirillo, L Turner, A. H Pryke, C Taylor, A. N Friedman, R. B Rusholme, B Rajguru, N Brown, M. L O'Sullivan, C Schwarz, R Leitch, E Orlando, A Bowden, M Thompson, K. L Cahill, G Melhuish, S. J Castro, P. G Gupta, S Kovac, J Hinderks, J Murphy, J. A Memari, Y Gear, W. K Ganga, K Lange, A. E Culverhouse, T Zemcov, M Church, S |
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Keywords | Statistical method Polarization methods: statistical Cosmological parameter Cosmic background radiation cosmic microwave background Cosmology cosmological parameters polarization |
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References | 22 24 Page (28) 2003; 148 Pryke (29) 2009; 692 26 Montroy (25) 2006; 647 Keskitalo (18) 2007; 2007 Reichardt (31) 2009; 694 Kirkman (19) 2003; 149 Nolta (27) 2009; 180 Kawasaki (17) 2007 Barkats (3) 2005; 619 30 10 11 12 34 35 14 36 15 16 Sievers (32) 2007; 660 Ade (1) 2008; 674 Dunkley (13) 2009; 180 Bischoff (7) 2008; 684 Lewis (23) 2000; 538 Spergel (33) 2007; 170 2 4 5 6 8 9 Verde (37) 2003; 148 20 21 |
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Title | Cosmological Parameters from the QUAD CMB Polarization Experiment |
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