标题： 对7年WMAP温度全天图中的同心圆搜索 显示英文标题

标题： A search for concentric circles in the 7-year WMAP temperature sky maps

摘要： 近期对WMAP七年温标天空地图的分析中，Gurzadyan和Penrose声称发现了高统计显著性的同心低方差圆环，以此作为大爆炸之前剧烈活动的证据。本文中，我们独立搜索了类似的同心低方差圆环，使用了卡方统计量和匹配滤波器，并将从七年WMAP温标天空地图得到的结果与来自LCDM模拟的结果进行了比较。我们的主要发现如下：我们确实重现了Gurzadyan和Penrose展示的WMAP数据中的环状结构，从而验证了他们的计算步骤。然而，我们的模拟结果与Gurzadyan和Penrose呈现的结果不一致。相反，我们在模拟中得到了明显更大的方差，以至于以这些统计量衡量，观测到的WMAP天空地图完全符合LCDM模型。 显示英文摘要

摘要： In a recent analysis of the 7-year WMAP temperature sky maps, Gurzadyan and Penrose claim to find evidence for violent pre-Big Bang activity in the form of concentric low-variance circles at high statistical significance. In this paper, we perform an independent search for such concentric low-variance circles, employing both chi^2 statistics and matched filters, and compare the results obtained from the 7-year WMAP temperature sky maps with those obtained from LCDM simulations. Our main findings are the following: We do reproduce the claimed ring structures observed in the WMAP data as presented by Gurzadyan and Penrose, thereby verifying their computational procedures. However, the results from our simulations do not agree with those presented by Gurzadyan and Penrose. On the contrary we obtain a substantially larger variance in our simulations, to the extent that the observed WMAP sky maps are fully consistent with the LCDM model as measured by these statistics.