Self-similarity and scaling behavior of scale-free gravitational clustering

Details Self-similarity and scaling behavior of scale-free gravitational clustering Self-similarity and scaling behavior of scale-free gravitational clustering

1995-08-29

arxiv.org/abs/astro-ph/9508142v1

Astrophys.J. 465 (1996) 14

Astronomy and Astrophysics

Astrophysics

31 pages, postscript file, figure 1 missing. Postscript file including figure 1 available at ftp://ftp-astro-theory.fnal.gov

Scientific paper

10.1086/177398

We measure the scaling properties of the probability distribution of the smoothed density field in $N$-body simulations of expanding universes with scale-free initial power-spectra, with particular attention to the predictions of the stable clustering hypothesis. We concentrate our analysis on the ratios $S_Q(\ell)\equiv {\bar \xi}_Q/{\bar \xi}_2^{Q-1}$, $Q \leq 5$, where ${\bar \xi}_Q$ is the averaged $Q$-body correlation function over a cell of radius $\ell$. The behavior of the higher order correlations is studied through that of the void probability distribution function. As functions of ${\bar \xi}_2$, the quantities $S_Q$, $3 \leq Q \leq 5$, exhibit two plateaus separated by a smooth transition around ${\bar \xi}_2 \sim 1$. In the weakly nonlinear regime, ${\bar \xi}_2 \la 1$, the results are in reasonable agreement with the predictions of perturbation theory. In the nonlinear regime, ${\bar \xi}_2 > 1$, the function $S_Q({\bar \xi}_2)$ is larger than in the weakly nonlinear regime, and increasingly so with $-n$. It is well-fitted by the expression $S_Q= ({\bar \xi}_2/100)^{0.045(Q-2)}\ {\widetilde S}_Q$ for all $n$. This weak dependence on scale proves {\em a small, but significant departure from the stable clustering predictions} at least for $n=0$ and $n=+1$. The analysis of $P_0$ confirms that the expected scale-invariance of the functions $S_Q$ is not exactly attained in the part of the nonlinear regime we probe, except possibly for $n=-2$ and marginally for $n=-1$. In these two cases, our measurements are not accurate enough to be discriminant.

Affiliated with

Also associated with

No associations

Rating

Self-similarity and scaling behavior of scale-free gravitational clustering does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Self-similarity and scaling behavior of scale-free gravitational clustering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-similarity and scaling behavior of scale-free gravitational clustering will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-260032