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Discreteness effects in ΛCDM simulations. A wavelet-statistical view


Romeo, A; Agertz, O; Moore, B; Stadel, J (2008). Discreteness effects in ΛCDM simulations. A wavelet-statistical view. Astrophysical Journal, 686(1):1-12.

Abstract

The effects of particle discreteness in N-body ΛCDM simulations are still an intensively debated issue. In this paper we explore such effects, taking into account the scatter caused by the randomness of the initial conditions and focusing on the statistical properties of the cosmological density field. For this purpose, we run large sets of ΛCDM simulations and analyze them using a wide variety of diagnostics, including new and powerful wavelet statistics. Among other facts, we point out (1) that dynamical evolution does not propagate discreteness noise up from the small scales at which it is introduced and (2) that one should aim to satisfy the condition epsilon ~ 2d, where epsilon is the force resolution and d is the interparticle distance. We clarify what such a condition means and how to implement it in modern cosmological codes

The effects of particle discreteness in N-body ΛCDM simulations are still an intensively debated issue. In this paper we explore such effects, taking into account the scatter caused by the randomness of the initial conditions and focusing on the statistical properties of the cosmological density field. For this purpose, we run large sets of ΛCDM simulations and analyze them using a wide variety of diagnostics, including new and powerful wavelet statistics. Among other facts, we point out (1) that dynamical evolution does not propagate discreteness noise up from the small scales at which it is introduced and (2) that one should aim to satisfy the condition epsilon ~ 2d, where epsilon is the force resolution and d is the interparticle distance. We clarify what such a condition means and how to implement it in modern cosmological codes

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Additional indexing

Other titles:Discreteness effects in lambda cold dark matter simulations: a wavelet-statistical view
Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:October 2008
Deposited On:18 Feb 2009 16:21
Last Modified:05 Apr 2016 12:56
Publisher:Institute of Physics Publishing
ISSN:0004-637X
Publisher DOI:10.1086/591236
Related URLs:http://arxiv.org/abs/0804.0294
Permanent URL: http://doi.org/10.5167/uzh-12268

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