Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-04-02
ApJ, 686, 1 (2008)
Astronomy and Astrophysics
Astrophysics
ApJ, in press. Minor changes to match the accepted version
Scientific paper
10.1086/591236
The effects of particle discreteness in N-body simulations of Lambda Cold Dark Matter (LambdaCDM) 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 LambdaCDM simulations and analyse them using a large 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.
Agertz Oscar
Moore Ben
Romeo Alessandro B.
Stadel Joachim
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