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Gravity and count probabilities in an expanding universeThe time evolution of nonlinear clustering on large scales in cold dark matter, hot dark matter, and white noise models of the universe is investigated using N-body simulations performed with a tree code. Count probabilities in cubic cells are determined as functions of the cell size and the clustering state (redshift), and comparisons are made with various theoretical models. We isolate the features that appear to be the result of gravitational instability, those that depend on the initial conditions, and those that are likely a consequence of numerical limitations. More specifically, we study the development of skewness, kurtosis, and the fifth moment in relation to variance, the dependence of the void probability on time as well as on sparseness of sampling, and the overall shape of the count probability distribution. Implications of our results for theoretical and observational studies are discussed.
Document ID
19930032106
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bouchet, Francois R. (CNRS Inst. d'Astrophysique, Paris, France)
Hernquist, Lars (Board of Studies in Astronomy and Astrophysics Santa Cruz, CA, United States)
Date Acquired
August 15, 2013
Publication Date
November 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 400
Issue: 1
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-2422
CONTRACT_GRANT: NSF AST-90-18526
Distribution Limits
Public
Copyright
Other