Numerical Analyses of Weakly Nonlinear Velocity‐Density Coupling | Zendy

Naoki Seto | Zendy; Naoshi Sugiyama | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Numerical Analyses of Weakly Nonlinear Velocity‐Density Coupling

Author(s) -

Naoki Seto,

Naoshi Sugiyama

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/322285

Subject(s) - smoothing , skewness , nonlinear system , physics , statistical physics , perturbation theory (quantum mechanics) , perturbation (astronomy) , constant (computer programming) , scaling , coupling constant , mathematical analysis , mathematics , quantum mechanics , statistics , geometry , computer science , programming language

We study evolution of various statistical quantities of smoothed cosmicdensity and velocity fields using N-body simulations. The parameter $C\equiv /( <\delta^2>)$ characterizes nonlinear coupling ofthese two fields and determines behavior of bulk velocity dispersion as afunction of local density contrast. It is found that this parameter depends strongly on the smoothing scale evenin quasi-linear regimes where the skewness parameter $S_3$ is nearly constant and close to the predicted value by the second-orderperturbation theory. We also analyze weakly nonlinear effects caused by anadaptive smoothing known as the gather approach.Comment: 22 pages, 4 figures, to appear in ApJ (558, Sep 10

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research