COSMOLOGICAL PARAMETERS FROM THE QUaD CMB POLARIZATION EXPERIMENT
COSMOLOGICAL PARAMETERS FROM THE QUaD CMB POLARIZATION EXPERIMENT
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DOI：
10.1088/0004-637x/701/2/857
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发表时间：
2009-01
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通讯作者：
QUaD collaboration P. G. Castro;P. Ade;J. Bock;M. Bowden;M. Brown;G. Cahill;S. Church;T. Culverhouse;R. Friedman;K. Ganga;W. Gear;S. Gupta;J. Hinderks;J. Kovac;A. Lange;E. Leitch;S. Melhuish;Y. Memari;J. Murphy;A. Orlando;C. Pryke;R. Schwarz;C. O'sullivan;L. Piccirillo;N. Rajguru;B. Rusholme;A. Taylor;K. Thompson;A. Turner;E. Y. S. Wu;M. Z. I. F. Astronomy;U. Edinburgh;Centra;Dep. de Fisica;I. Técnico;S. O. Physics;Astronomy;Cardiff University;J. P. Laboratory;C. I. O. Technology.;Kavli Institute for Astrophysics;Cosmology;D. Physics;Stanford University;Kavli Institute for Cosmological Physics;D. O. Astronomy;Astrophysics;Enrico Fermi Institute;U. Chicago;C. Laboratory;U. Cambridge;D. Physics;National University of Ireland Maynooth;Laboratoire Apc Umr 7164;U. Paris;Nasa Goddard;U. Manchester;Ucl
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作者：
QUaD collaboration P. G. Castro;P. Ade;J. Bock;M. Bowden;M. Brown;G. Cahill;S. Church;T. Culverhouse;R. Friedman;K. Ganga;W. Gear;S. Gupta;J. Hinderks;J. Kovac;A. Lange;E. Leitch;S. Melhuish;Y. Memari;J. Murphy;A. Orlando;C. Pryke;R. Schwarz;C. O'sullivan;L. Piccirillo;N. Rajguru;B. Rusholme;A. Taylor;K. Thompson;A. Turner;E. Y. S. Wu;M. Z. I. F. Astronomy;U. Edinburgh;Centra;Dep. de Fisica;I. Técnico;S. O. Physics;Astronomy;Cardiff University;J. P. Laboratory;C. I. O. Technology.;Kavli Institute for Astrophysics;Cosmology;D. Physics;Stanford University;Kavli Institute for Cosmological Physics;D. O. Astronomy;Astrophysics;Enrico Fermi Institute;U. Chicago;C. Laboratory;U. Cambridge;D. Physics;National University of Ireland Maynooth;Laboratoire Apc Umr 7164;U. Paris;Nasa Goddard;U. Manchester;Ucl
本文利用QUaD实验对第二季和第三季的偏振和温度功率谱进行了参数估计分析。QUaD首次在E模式偏振光谱中检测到多个具有高度显著性的声学峰。虽然QUaD唯一的参数约束与标准六参数ΛCDM宇宙学的先前结果不具有竞争力，但它们确实首次允许有意义的仅偏振参数分析。在标准的六参数ΛCDM分析中，我们发现QUaD TT功率谱与以前的结果非常一致。然而，QUaD偏振数据显示出与ΛCDM的一些张力。这种1σ-2σ张力的起源仍然不清楚，可能指向新的物理学、剩余系统学或简单的随机机会。我们还将联合收割机QUaD与五年WMAP数据集和SDSS发光红星系第四次数据发布功率谱相结合，并将我们的分析扩展到约束单个等曲率模分数，约束冷暗物质密度，αcdmi < 0.11（95%置信限（CL）），中微子密度，αndi < 0.26（95% CL），中微子速度，αnvi < 0.23（95% CL），模式。我们的分析为未来的极化实验设定了一个基准。
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.