IMPROVED MEASUREMENTS OF THE TEMPERATURE AND POLARIZATION OF THE COSMIC MICROWAVE BACKGROUND FROM QUaD
IMPROVED MEASUREMENTS OF THE TEMPERATURE AND POLARIZATION OF THE COSMIC MICROWAVE BACKGROUND FROM QUaD
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改进的 QUaD 宇宙微波背景温度和偏振测量
DOI：
10.1088/0004-637x/705/1/978
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发表时间：
2009
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影响因子：
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通讯作者：
Brown M
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文献类型：
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作者：
Brown M
我们提出了一种改进的分析来自四边形实验的最终数据集。使用一种改进的技术来去除地面污染，我们将有效天空面积增加了一倍，因此我们的宇宙微波背景功率谱测量精度比之前报道的提高了∼30%。此外，我们改进了仪器束的建模，并将温度的绝对校准不确定度从5%降低到3.5%。通过广泛的折刀测试以及我们发现的两个完全独立的分析管道之间的协议，我们的结果的健壮性得到了证实。对于标准的六参数WMAP清洁发展机制模型，与仅从Λ实验获得的参数相比，四元数据的添加略微改善了对一些宇宙学参数的约束。对于扩展到包括标量谱索引中的游程或可能的张量分量，或两者都包括的模型，四元数据的影响要大得多。综合四象限数据和ArcMinin宇宙学测辐射热计阵列接收器实验的结果，光谱指数运行的不确定度比单独使用WMAP降低了25%，而张量标量比的上限从r<；0.48降低到r<；0.33(95%CL)。这是迄今为止仅中巴一家对张量的最强限制。我们还使用我们的偏振测量来对最后一次散射表面的宇称破坏相互作用施加约束，将洛伦兹破坏相互作用的能量标度限制在<；1.5×10−43GeV(68%CL)。最后，我们对透镜B模信号的强度设置了一个稳健的上限。假设单个平带功率在ℓ=2 0 0和ℓ=2 0 0 0之间，我们将B模的振幅限制为<；0.5 7μK2(95%CL)。
We present an improved analysis of the final data set 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 cosmic microwave background (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 that we find between our two fully independent analysis pipelines. For the standard six-parameter ΛCDM 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 Arcminute Cosmology Bolometer Array Receiver 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% cl). 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× 10− 43 GeV (68% cl). 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 μK 2 (95% cl).