Distribution of averages in a correlated Gaussian medium as a tool for the estimation of the cluster distribution on size

TL;DR

This paper investigates how the distribution of averages in a correlated Gaussian medium can be used to estimate the size distribution of clusters, highlighting the influence of spatial correlations on the distribution's width.

Contribution

It introduces a method linking the distribution of field averages to the asymptotic cluster size distribution in correlated Gaussian media.

Findings

Distribution width depends strongly on spatial correlations.

The average field distribution can estimate cluster size behavior.

Method applicable to deep clusters with high field values.

Abstract

Calculation of the distribution of the average value of a Gaussian random field in a finite domain is carried out for different cases. The results of the calculation demonstrate a strong dependence of the width of the distribution on the spatial correlations of the field. Comparison with the simulation results for the distribution of the size of the cluster indicates that the distribution of an average field could serve as a useful tool for the estimation of the asymptotic behavior of the distribution of the size of the clusters for "deep" clusters where value of the field on each site is much greater than the rms disorder.