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Skewness in large-scale structure and non-Gaussian initial conditionsWe compute the skewness of the galaxy distribution arising from the nonlinear evolution of arbitrary non-Gaussian intial conditions to second order in perturbation theory including the effects of nonlinear biasing. The result contains a term identical to that for a Gaussian initial distribution plus terms which depend on the skewness and kurtosis of the initial conditions. The results are model dependent; we present calculations for several toy models. At late times, the leading contribution from the initial skewness decays away relative to the other terms and becomes increasingly unimportant, but the contribution from initial kurtosis, previously overlooked, has the same time dependence as the Gaussian terms. Observations of a linear dependence of the normalized skewness on the rms density fluctuation therefore do not necessarily rule out initially non-Gaussian models. We also show that with non-Gaussian initial conditions the first correction to linear theory for the mean square density fluctuation is larger than for Gaussian models.
Document ID
19950037344
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fry, J. N.
(Univ. of Florida, Gainsville, FL United States)
Scherrer, Robert J.
(Ohio State Univ. Columbus, OH, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1994
Publication Information
Publication: The Astrophysical Journal, Part 1
Volume: 429
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A68943
Funding Number(s)
CONTRACT_GRANT: NAGW-2381
CONTRACT_GRANT: NAGW-2589
CONTRACT_GRANT: DE-AC02-76ER01545
Distribution Limits
Public
Copyright
Other

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