Larsen Patricia, Challinor Anthony, Sherwin Blake D, Mak Daisy
Institute of Astronomy and Kavli Institute for Cosmology Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom.
DAMTP, Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA, United Kingdom.
Phys Rev Lett. 2016 Oct 7;117(15):151102. doi: 10.1103/PhysRevLett.117.151102. Epub 2016 Oct 5.
Delensing is an increasingly important technique to reverse the gravitational lensing of the cosmic microwave background (CMB) and thus reveal primordial signals the lensing may obscure. We present a first demonstration of delensing on Planck temperature maps using the cosmic infrared background (CIB). Reversing the lensing deflections in Planck CMB temperature maps using a linear combination of the 545 and 857 GHz maps as a lensing tracer, we find that the lensing effects in the temperature power spectrum are reduced in a manner consistent with theoretical expectations. In particular, the characteristic sharpening of the acoustic peaks of the temperature power spectrum resulting from successful delensing is detected at a significance of 16σ, with an amplitude of A_{delens}=1.12±0.07 relative to the expected value of unity. This first demonstration on data of CIB delensing, and of delensing techniques in general, is significant because lensing removal will soon be essential for achieving high-precision constraints on inflationary B-mode polarization.
去透镜化是一种日益重要的技术，用于逆转宇宙微波背景（CMB）的引力透镜效应，从而揭示透镜效应可能掩盖的原始信号。我们首次展示了利用宇宙红外背景（CIB）对普朗克温度图进行去透镜化。使用545和857吉赫兹地图的线性组合作为透镜化示踪剂，来逆转普朗克CMB温度图中的透镜化偏转，我们发现温度功率谱中的透镜化效应以与理论预期一致的方式降低。特别是，成功去透镜化导致的温度功率谱声学峰值的特征锐化在16σ的显著性水平上被检测到，相对于预期的单位值，其幅度为A_{去透镜化}=1.12±0.07。这首次在CIB去透镜化数据以及一般去透镜化技术上的展示具有重要意义，因为去除透镜效应对于实现对暴胀B模式极化的高精度约束很快将变得至关重要。
