Non-Gaussianity of the density distribution in accelerating universes II:N-body simulations

概要

論文の詳細を見る
We explore the possibility of putting constraints on dark energy modelswith statistical property of large scale structure in the non-linear region. Inparticular, we investigate the w dependence of non-Gaussianity of the smoothed densitydistribution generated by the nonlinear dynamics. In order to follow the non-linearevolution of the density fluctuations, we apply N-body simulations based on P3Mscheme. We show that the relative difference between non-Gaussianity of w = −0.8model and that of w = −1.0 model is 0.67% (skewness) and 1.2% (kurtosis) forR = 8h−1 Mpc. We also calculate the correspondent quantities for R = 2h−1 Mpc,3.0% (skewness) and 4.5% (kurtosis), and the difference turn out to be greater, eventhough non-linearity in this scale is so strong that the complex physical processesabout galaxy formation affect the galaxy distribution. From this, we can expect thatthe difference can be tested by all sky galaxy surveys with the help of mock catalogscreated by selection functions, which suggests that non-Gaussianity of the densitydistribution potentially plays an important role for extracting information on dark energy.