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arXiv 1111.1794astro-ph.CO
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非高斯场物理与宇宙学亏格统计

Physics of non-Gaussian fields and the cosmological genus statistic

J. Berian James

摘要:

我们报告了一种技术来计算不同的物理过程诱导非高斯宇宙学密度场的影响。通过将宇宙属统计量自然分解为一个正交多项式序列,可以完整地描述大尺度结构形态的尺度依赖演化,其中包括星系偏置、非线性引力演化和原初非高斯性等效应。简要地考虑了这种分解与以前分析属统计量的方法之间的关系,并作了以下应用:i)某些影响拓扑测量的系统学的表达,ii)在Horizon Run模拟中测量的属统计量中出现的高斯性的广泛变形的量化,iii)在某些系统学中影响拓扑测量的广泛变形的量化,iv)在某些系统学中影响拓扑测量的广泛变形的量化。iii)研究具有原始非高斯性的模拟的亏格曲线的演化。这些进展改善了用于这种测量的通量限制星系目录的处理,并进一步使用属统计作为探索非高斯性的工具。

英文摘要:

We report a technique to calculate the impact of distinct physical processes inducing non-Gaussianity on the cosmological density field. A natural decomposition of the cosmic genus statistic into an orthogonal polynomial sequence allows complete expression of the scale-dependent evolution of the morphology of large-scale structure, in which effects including galaxy bias, nonlinear gravitational evolution and primordial non-Gaussianity may be delineated. The relationship of this decomposition to previous methods for analysing the genus statistic is briefly considered and the following applications are made: i) the expression of certain systematics affecting topological measurements; ii) the quantification of broad deformations from Gaussianity that appear in the genus statistic as measured in the Horizon Run simulation; iii) the study of the evolution of the genus curve for simulations with primordial non-Gaussianity. These advances improve the treatment of flux-limited galaxy catalogues for use with this measurement and further the use of the genus statistic as a tool for exploring non-Gaussianity.

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