Constructing, characterizing, and simulating Gaussian and higher--order point distributions

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  • 9 February 2001
Abstract
The definition and the properties of a Gaussian point distribution, in contrast to the well-known properties of a Gaussian random field are discussed. Constraints for the number density and the two-point correlation function arise. A simple method for the simulation of this so-called Gauss-Poisson point process is given and illustrated with an example. The comparison of the distribution of galaxies in the PSCz catalogue with the Gauss-Poisson process underlines the importance of higher-order correlation functions for the description for the galaxy distribution. The construction of the Gauss-Poisson point process is extended to the n-point Poisson cluster process, now incorporating correlation functions up to the nth-order. The simulation methods and constraints on the correlation functions are discussed for the n-point case and detailed for the three-point case. A generalized halo-model allowing for halo-substructure is discussed. The influence of halo-substructure on the two- and three-point correlation functions is calculated in this model.

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