Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-02-24
Mon.Not.Roy.Astron.Soc. 264 (1993) 749-757
Astronomy and Astrophysics
Astrophysics
1+12 pages (in Latex), 3 figures available upon request, DAPD-202
Scientific paper
We investigate the evolution of the skewness of the distribution of density fluctuations in CDM models with both Gaussian and non--Gaussian initial fluctuations. We show that the method proposed by Coles \& Frenk (1991), which uses the skewness of galaxy counts to test the hypothesis of Gaussian primordial density fluctuations, is a potentially powerful probe of initial conditions. As expected, the mass distribution in models with initially non--Gaussian fluctuations shows systematic departures from the Gaussian behaviour on intermediate to large scales. We investigate the effect of peculiar velocity distortions and normalisation upon the relationship between skewness and variance. These effects are generally small for the models we consider. Comparing our results to the QDOT measurements of the skewness, we find that our initially positive--skew models are clearly excluded by this analysis, but the available data do not rule out the negative--skew models.
Coles Peter
Lucchin Francesco
Matarrese Sabino
Messina Andrea
Moscardini Lauro
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