Constraints on the topology of the Universe derived from the 7-yr WMAP data
Constraints on the topology of the Universe derived from the 7-yr WMAP data
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从 7 年 WMAP 数据导出的宇宙拓扑约束
DOI：
10.1111/j.1365-2966.2010.18057.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
A. Banday
中科院分区：
文献类型：
--
作者：
P. Bielewicz;A. Banday
我们施加约束的宇宙拓扑结构确定从搜索匹配的圆的温度各向异性模式的7年威尔金森微波各向异性探测器（WMAP）的数据。我们特别注意该方法对天空地图的残留前景污染的敏感性，并表明对于CMB信号的全天估计（内部线性组合地图），此类残留对匹配圆的统计数据产生了不可忽视的影响。为了减少这种影响，我们进行分析的地图，其中污染最严重的地区已被删除。在更高分辨率的WMAP W波段图中搜索匹配的背靠背圆对，可以对拓扑结构施加更严格的约束。我们的结果排除了具有拓扑结构的宇宙，这些拓扑结构预测了半径大于α min <$10 °的成对圆。这为平坦宇宙的基本域尺寸设定了一个下限，约为27.9 Gpc。这个界限接近于用匹配圆方法可能探测到的宇宙大小的上限，即可观测宇宙的直径为28.3 Gpc。
We impose constraints on the topology of the Universe determined from a search for matched circles in the temperature anisotropy patterns of the 7-yr Wilkinson Microwave Anisotropy Probe (WMAP) data. We pay special attention to the sensitivity of the method to residual foreground contamination of the sky maps and show that for a full-sky estimate of the CMB signal (the Internal Linear Combination map) such residuals introduce a non-negligible effect on the statistics of matched circles. In order to reduce this effect, we perform the analysis on maps for which the most contaminated regions have been removed. A search for pairs of matched back-to-back circles in the higher resolution WMAP W-band map allows tighter constraints to be imposed on topology. Our results rule out universes with topologies that predict pairs of such circles with radii larger than α min ≈ 10°. This places a lower bound on the size of the fundamental domain for a flat universe of about 27.9 Gpc. This bound is close to the upper limit on the size of Universe possible to be detected by the method of matched circles, i.e. the diameter of the observable Universe is 28.3 Gpc.