School of Physics and Astronomy, Cardiff University, Cardiff CF10 3XQ, United Kingdom.
The Graduate University for Advanced Studies, Hayama, Miura District, Kanagawa 240-0115, Japan.
Phys Rev Lett. 2014 Apr 4;112(13):131302. doi: 10.1103/PhysRevLett.112.131302. Epub 2014 Apr 2.
We reconstruct the gravitational lensing convergence signal from cosmic microwave background (CMB) polarization data taken by the Polarbear experiment and cross-correlate it with cosmic infrared background maps from the Herschel satellite. From the cross spectra, we obtain evidence for gravitational lensing of the CMB polarization at a statistical significance of 4.0σ and indication of the presence of a lensing B-mode signal at a significance of 2.3σ. We demonstrate that our results are not biased by instrumental and astrophysical systematic errors by performing null tests, checks with simulated and real data, and analytical calculations. This measurement of polarization lensing, made via the robust cross-correlation channel, not only reinforces POLARBEAR auto-correlation measurements, but also represents one of the early steps towards establishing CMB polarization lensing as a powerful new probe of cosmology and astrophysics.
我们从 Polarbear 实验获取的宇宙微波背景（CMB）极化数据中重建了引力透镜汇聚信号，并将其与赫歇尔卫星获取的宇宙红外背景图进行了交叉相关。从交叉谱中，我们以 4.0σ 的统计显著性获得了 CMB 极化引力透镜的证据，并以 2.3σ 的显著性表明存在透镜 B 模式信号。我们通过进行零假设检验、使用模拟数据和实际数据进行检查以及进行分析计算，证明了我们的结果不受仪器和天体物理系统误差的影响。这种通过稳健的交叉相关通道进行的极化透镜测量不仅增强了 POLARBEAR 自相关测量，而且也是朝着将 CMB 极化透镜测量确立为宇宙学和天体物理学的一种强大新探针迈出的早期步骤之一。
