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Type: Artigo de periódico
Title: Small deviations from Gaussianity and the galaxy cluster abundance evolution
Author: Ribeiro, ALB
Wuensche, CA
Letelier, PS
Abstract: In this paper, we raise the hypothesis that the density fluctuation held, which originates the growth of large-scale structures, is a combination of two or more distributions, instead of assuming that the observed distribution of matter stems from a single Gaussian held produced in the very early universe, as is widely accepted. By applying the statistical analysis of finite-mixture distributions to a specific combination of Gaussian plus non-Gaussian random fields, we studied the case in which just a small departure from Gaussianity is allowed. Our results suggest that even a very small level of non-Gaussianity may introduce significant changes in the cluster abundance evolution rate.
Subject: cosmology : theory
galaxies : clusters : general
large-scale structure of universe
Country: EUA
Editor: Univ Chicago Press
Citation: Astrophysical Journal. Univ Chicago Press, v. 539, n. 1, n. 1, n. 4, 2000.
Rights: aberto
Identifier DOI: 10.1086/309232
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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