Modification of the halo mass function by kurtosis associated with primordial non-Gaussianity
Modification of the halo mass function by kurtosis associated with primordial non-Gaussianity
复制标题
通过与原始非高斯性相关的峰度对晕质量函数的修改
DOI：
10.1111/j.1365-2966.2011.19323.x
复制
发表时间：
2011
影响因子：
4.8
通讯作者：
J.Silk
中科院分区：
文献类型：
--
作者：
S.Yokoyama;N.Sugiyama;S.Zaroubi;J.Silk
我们研究了存在峰度类型的原始非高斯性的晕质量函数。峰度对应于傅立叶空间中定义的三谱。原始三谱通常由两个参数τNLandgNL表征。我们重点讨论了检验多场暴胀模型物理性质的一个重要参数τ NL。作为导出的非高斯质量函数的应用，我们考虑了在高红移处对空洞结构丰度、早期星星形成和最大质量天体形成的影响。通过比较原始非高斯性对团簇丰度和空洞丰度的影响，我们可以区分原始非高斯性的偏态和峰度类型。至于早期星星的形成，我们表明，峰度型的原始非高斯平均似乎不影响宇宙的再电离历史。然而，在高红移下（高达20），这种非高斯性确实对再电离的早期阶段有一定的影响。
We study the halo mass function in the presence of a kurtosis type of primordial non-Gaussianity. The kurtosis corresponds to the trispectrum as defined in Fourier space. The primordial trispectrum is commonly characterized by two parameters, τNLandgNL. We focus on τNLwhich is an important parameter to test the physics of multifield inflation models. As applications of the derived non-Gaussian mass function, we consider the effects on the abundance of void structure, on early star formation and on formation of the most massive objects at high redshift. We show that by comparing the effects of primordial non-Gaussianity on cluster abundance with that on void abundance, we can distinguish between the skewness and the kurtosis types of primordial non-Gaussianity. As for early star formation, we show that the kurtosis type of primordial non-Gaussianity seems on the average not to affect the reionization history of the Universe. However, at high redshifts (up toz≃ 20) such non-Gaussianity does somewhat affect the early stages of reionization.