Measurement of the Cosmic Microwave Background Polarization Lensing Power Spectrum with the POLARBEAR Experiment
Measurement of the Cosmic Microwave Background Polarization Lensing Power Spectrum with the POLARBEAR Experiment
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DOI：
10.1103/physrevlett.113.021301
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发表时间：
2014-07-09
影响因子：
8.6
通讯作者：
Zahn, O.
中科院分区：
文献类型：
--
作者：
Ade, P. A. R.;Akiba, Y.;Zahn, O.
由于物质在宇宙中的大尺度分布，引力透镜扭曲了原始宇宙微波背景(CMB)，从而产生了新的小尺度B模偏振。这个信号携带着所有引力物质在观测者和CMB最后一个散射面之间的分布的详细信息。我们报道了基于纯CMB信息的偏振透镜的第一个直接证据，该证据是通过使用极地实验测量的天空30平方度范围内的奇偶宇称E模和B模偏振的四点关联得到的。使用盲分析框架对这些数据进行分析，并使用零测试和模拟检查虚假的系统污染。偏振透镜和透镜B模信号的证据在4.2sigma(stat+sys)意义上被发现。物质涨落幅度的测量精度为27%，与Lambda冷暗物质宇宙学模型一致。这项测量展示了一种新技术，能够绘制宇宙中所有引力物质的地图，对中微子质量的总和很敏感，对于在搜索原始引力波的过程中清除透镜B模信号至关重要。
Gravitational lensing due to the large-scale distribution of matter in the cosmos distorts the primordial cosmic microwave background (CMB) and thereby induces new, small-scale B-mode polarization. This signal carries detailed information about the distribution of all the gravitating matter between the observer and CMB last scattering surface. We report the first direct evidence for polarization lensing based on purely CMB information, from using the four-point correlations of even- and odd-parity E- and B-mode polarization mapped over similar to 30 square degrees of the sky measured by the POLARBEAR experiment. These data were analyzed using a blind analysis framework and checked for spurious systematic contamination using null tests and simulations. Evidence for the signal of polarization lensing and lensing B modes is found at 4.2 sigma(stat + sys) significance. The amplitude of matter fluctuations is measured with a precision of 27%, and is found to be consistent with the Lambda cold dark matter cosmological model. This measurement demonstrates a new technique, capable of mapping all gravitating matter in the Universe, sensitive to the sum of neutrino masses, and essential for cleaning the lensing B-mode signal in searches for primordial gravitational waves.