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arXiv 0906.1003astro-ph.CO
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改进QUaD的CMB温度和极化测量

Improved measurements of the temperature and polarization of the CMB from QUaD

The QUaD collaboration, M. L. Brown, P. Ade, J. Bock, M. Bowden, G. Cahill, P. G. Castro, S. Church, T. Culverhouse, R. B. Friedman, K. Ganga, W. K. Gear, S. Gu… 展开作者

The QUaD collaboration, M. L. Brown, P. Ade, J. Bock, M. Bowden, G. Cahill, P. G. Castro, S. Church, T. Culverhouse, R. B. Friedman, K. Ganga, W. K. Gear, S. Gupta, J. Hinderks, J. Kovac, A. E. Lange, E. Leitch, S. J. Melhuish, Y. Memari, J. A. Murphy, A. Orlando, C. 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, M. Zemcov

摘要:

我们提出了一个改进的分析,从QUaD实验的最终数据集。使用一种改进的技术来消除地面污染,我们增加了一倍的有效天空面积,因此增加了我们的CMB功率谱测量的精度约30%,与以前报道的。此外,我们还改进了仪器光束的建模,并将温度方面的绝对校准不确定度从5%降低到3.5%。我们的结果的鲁棒性是通过广泛的折刀测试和协议的方式,我们发现我们的两个完全独立的分析管道。对于标准的6参数LCDM模型,QUaD数据的加入略微改善了对一些宇宙学参数的约束,而这些参数仅来自WMAP实验。QUaD数据的影响对于扩展到包括标量光谱指数中的运行或可能的张量分量或两者的模型来说要大得多。将QUaD数据和ACBAR实验的结果相加,与单独的WMAP相比,光谱指数运行的不确定性降低了约25%,而张量标量比的上限从r < 0.48降低到r < 0.33(95% c.l)。这是迄今为止仅从CMB对张量的最强限制。我们还使用我们的极化测量来将宇称违反相互作用的约束放置到最后散射的表面,将洛伦兹违反相互作用的能量尺度约束到< 1.5 x 10^{-43} GeV(68% c.l.)。最后,我们对透镜B模式信号的强度设置了一个鲁棒的上限。假设单个平带功率在l = 200和l = 2000之间,我们将B模的振幅限制为< 0.57微K ^2(95% c.l.)。

英文摘要:

We present an improved analysis of the final dataset from the QUaD experiment. Using an improved technique to remove ground contamination, we double the effective sky area and hence increase the precision of our CMB power spectrum measurements by ~30% versus that previously reported. In addition, we have improved our modeling of the instrument beams and have reduced our absolute calibration uncertainty from 5% to 3.5% in temperature. The robustness of our results is confirmed through extensive jackknife tests and by way of the agreement we find between our two fully independent analysis pipelines. For the standard 6-parameter LCDM model, the addition of QUaD data marginally improves the constraints on a number of cosmological parameters over those obtained from the WMAP experiment alone. The impact of QUaD data is significantly greater for a model extended to include either a running in the scalar spectral index, or a possible tensor component, or both. Adding both the QUaD data and the results from the ACBAR experiment, the uncertainty in the spectral index running is reduced by ~25% compared to WMAP alone, while the upper limit on the tensor-to-scalar ratio is reduced from r < 0.48 to r < 0.33 (95% c.l). This is the strongest limit on tensors to date from the CMB alone. We also use our polarization measurements to place constraints on parity violating interactions to the surface of last scattering, constraining the energy scale of Lorentz violating interactions to < 1.5 x 10^{-43} GeV (68% c.l.). Finally, we place a robust upper limit on the strength of the lensing B-mode signal. Assuming a single flat band power between l = 200 and l = 2000, we constrain the amplitude of B-modes to be < 0.57 micro-K^2 (95% c.l.).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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