Year: 1997
Type: article
Abstract: We apply several statistical estimators to high-resolution N -body simulations of two currently viable cosmological models: a mixed dark matter model, having Ω ν = 0.2 contributed by two massive neutrinos (C + 2νDM), and a cold dark matter model with cosmological constant (ΛCDM) with Ω 0 = 0.3 and h = 0.7. Our aim is to compare simulated galaxy samples with the Perseus-Pisces redshift survey (PPS). We consider the n -point correlation functions ( n = 2-4); the N -count probability functions P N , including the void probability function P 0 ; and the underdensity probability function U (where fixes the underdensity threshold in percentage of the average). We find that P 0 (for which PPS and CfA2 data agree) and P 1 distinguish efficiently between the models, while U is only marginally discriminatory. On the contrary, the reduced skewness and kurtosis are, respectively, S 3 ≃ 2.2 and S 4 ≃ 6-7 in all cases, quite independent of the scale, in agreement with hierarchical scaling predictions and estimates based on redshift surveys. Among our results, we emphasize the remarkable agreement between PPS data and C + 2νDM in all the tests performed. In contrast, the above ΛCDM model has serious difficulties in reproducing observational data if galaxies and matter overdensities are related in a simple way.
Source: The Astrophysical Journal
DOI: 10.1086/303912
Institutions: University of Milan, Durham University, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, New Mexico State University, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Astro Space Center, University of California, Santa Cruz
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1631357997