原始非高斯性在大尺度结构上的印记：尺度依赖偏差和维里化对象的丰度
The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
摘要：
我们研究了原始非高斯性对大尺度结构的影响，重点是最大质量的维里化对象。使用解析参数和N体模拟，我们计算了质量函数和集群的暗物质晕在一系列的红移和水平的非高斯。我们提出了一个简单的拟合函数的质量函数有效的整个范围内，我们的模拟。我们发现显着的非高斯效应上的集群的暗物质晕，导致强烈的规模依赖的偏见。这表明，稀有天体的大规模聚集可能为原始非高斯性提供了一个灵敏的探测器。我们非常粗略地估计，即将进行的调查可以限制非高斯在|fNL| <~ 10的水平，与预测的微波背景的限制竞争。
英文摘要：
We study the effect of primordial nongaussianity on large-scale structure, focusing upon the most massive virialized objects. Using analytic arguments and N-body simulations, we calculate the mass function and clustering of dark matter halos across a range of redshifts and levels of nongaussianity. We propose a simple fitting function for the mass function valid across the entire range of our simulations. We find pronounced effects of nongaussianity on the clustering of dark matter halos, leading to strongly scale-dependent bias. This suggests that the large-scale clustering of rare objects may provide a sensitive probe of primordial nongaussianity. We very roughly estimate that upcoming surveys can constrain nongaussianity at the level |fNL| <~ 10, competitive with forecasted constraints from the microwave background.
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