Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of nonrandom patterns in cosmological gravitational clustering   A new method for analyzing point patterns produced by the evolution of
gravitational clustering is presented. The method is taken from the study of
molecular liquids, where it has been introduced for making a statistical
description of anisotropic distributions. The statistical approach is based on
the spherical harmonic expansion of angular correlations. A general
introduction to the method is given; a theoretical analysis shows that it is
partially connected with previous harmonic analyses applied to galaxy catalogs.
The effectiveness of the statistical analysis in quantifying clustering
morphology is illustrated by applying the statistical estimators to point
distributions produced by an ensemble of cosmological $N-$ body simulations
with a CDM spectrum. The results demonstrate that the statistical method is
able to detect anisotropies in non-random patterns, with different scales being
probed according to the expansion coefficients.

37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph