科研之友
微信
新浪微博
Facebook
分享链接
摘要
We report the finding of a scaling relation among the cosmic-web anisotropy parameter A, the linear density rms fluctuation sigma(r) and the linear growth factor D(z). Using the tidal field derived from the Millennium Simulation on 512(3) grids at z = 0, 2, 5 and 127, we calculate the largest eigenvalues lambda of the local tidal tensor at each grid resolution and measure its distance-averaged two-point correlation function, xi(lambda), as a function of the cosines of polar angles cos theta in the local principal axis frame. We show that xi(lambda) is quite anisotropic, increasing toward the directions of minimal matter compression, and that the anisotropy of xi(lambda) increases as the redshift z decreases and as the upper distance cutoff r(c) decreases. Fitting the numerical results to an analytic fitting model xi(lambda) (cos theta). (1 + Acos(n) theta)(-1), it is found that the best fit value
- 出版日期2010-5
