摘要
重谱(bispectrum)即傅立叶空间的三点相关函数,是研究由引力不稳定性产生的大尺度结构的最低非高斯阶统计性质。结合二维和三维的快速傅立叶变换,利用高精度冷暗物质宇宙学模型的N体数值模拟,测量了从弱线性区域到强非线性区域的重谱。
Bispectrum,the three-point correlation function in Fourier space,is the lowest order statistic that probes the shape of the large-scale structures generated by the gravitational clustering.With the two-dimensional and three-dimensional Fast Fourier Transformation,we measured the bispectrum from quasi-nonlinear to strong nonlinear region with N-body simulation of LCDM.
关键词
大尺度结构
数值模拟
统计方法
cosmology
large-scale structure of Universe-methods
N-body simulations-methods
statistical
