论文标题
镜头下的CMB冷点：排除Supervoid解释
The CMB cold spot under the lens: ruling out a supervoid interpretation
论文作者
论文摘要
宇宙微波背景（CMB）各向异性被认为是各向同性和高斯。但是，观察到几个异常，包括CMB冷点，这是一种意外的冷$ \ sim 10^{\ circ} $区域，带有$ p $ -value $ \ lyssim 0.01 $ 0.01 $ in Standard $λ$ CDM。寒冷点的拟议起源之一是视线上的一个异常大的空隙，它将通过集成的萨克斯 - 沃尔夫（Sachs-Wolfe）和里斯·塞米亚（Rees-Sciama）效应的结合而产生一个冷区域。在过去的十年中，大规模结构调查进行了大规模的搜索，无论是光学和红外线，以$ z \ Lessim 1 $ 1 $ 1 $，但确实找到了大量空隙的证据，但深度和大小只能说明一小部分异常。在这里，我们分析了Planck CMB数据中的透镜信号，并排除了以下假设：冷点可能是由于我们和最后一个散射表面的任何地方都造成的。特别是，计算证据比，我们发现与$λ$ CDM相比，具有较大空隙的模型是不利的，而Smica（NILC）地图的赔率为1：13（1：20），与原始赔率56：1（21：1）相比，仅使用温度数据而言。
The Cosmic Microwave Background (CMB) anisotropies are thought to be statistically isotropic and Gaussian. However, several anomalies are observed, including the CMB Cold Spot, an unexpected cold $\sim 10^{\circ}$ region with $p$-value $\lesssim 0.01$ in standard $Λ$CDM. One of the proposed origins of the Cold Spot is an unusually large void on the line of sight, that would generate a cold region through the combination of integrated Sachs-Wolfe and Rees-Sciama effects. In the past decade extensive searches were conducted in large scale structure surveys, both in optical and infrared, in the same area for $z \lesssim 1$ and did find evidence of large voids, but of depth and size able to account for only a fraction of the anomaly. Here we analyze the lensing signal in the Planck CMB data and rule out the hypothesis that the Cold Spot could be due to a large void located anywhere between us and the surface of last scattering. In particular, computing the evidence ratio we find that a model with a large void is disfavored compared to $Λ$CDM, with odds 1 : 13 (1 : 20) for SMICA (NILC) maps, compared to the original odds 56 : 1 (21 : 1) using temperature data alone.
