Constraining the topology of the Universe using the polarised CMB maps.
Constraining the topology of the Universe using the polarised CMB maps.
复制标题
使用极化 CMB 地图约束宇宙的拓扑。
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
K. Gorski
中科院分区：
文献类型：
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作者：
P. Bielewicz;A. Banday;K. Gorski
本文研究了利用匹配圆统计量对极化宇宙微波背景各向异性图约束宇宙拓扑结构的可能性。在拓扑研究中使用微波背景极化图比简单地分析温度数据的优势已被清楚地证明。我们测试了我们的算法，在具有3环面拓扑的宇宙的模拟CMB地图上搜索匹配的圆对。发现普朗克和下一代CMB实验数据的噪声水平不再令人难以接受，并且应该足够低，以便能够使用极化图进行此类研究。在此实验中，确定了可检测到的背对背匹配圆的最小半径。我们还表明，再电离后产生的偏振对匹配圆的可探测性没有影响。
We study the possibility for constraining the topology of the Universe by means of the matched circles statistic applied to polarised cosmic microwave background (CMB) anisotropy maps. The advantages of using the CMB polarisation maps in studies of the topology over simply analysing the temperature data as has been done to-date are clearly demonstrated. We test our algorithm to search for pairs of matched circles on simulated CMB maps for a universe with the topology of 3-torus. It is found that the noise levels of both Planck and next generation CMB experiments data are no longer prohibitive and should be low enough to enable the use of the polarisation maps for such studies. For such experiments the minimum radius of the back-to-back matched circles which can be detected are determined. We also showed that the polarisation generated after reionisation does not have an impact on detectability of the matched circles.