Dark Matter, Discreteness and Collision Error in Cosmological N-Body Simulations

Details Dark Matter, Discreteness and Collision Error in Cosmological N-Body Simulations Dark Matter, Discreteness and Collision Error in Cosmological N-Body Simulations

1997-11-11

arxiv.org/abs/astro-ph/9711105v1

Astronomy and Astrophysics

Astrophysics

Latex, 12 pages, with 3 figures

Scientific paper

We report on a series of tests of agreement between three types of N-body simulations: PM, P$^3$M, and Tree codes. We find good agreement in both the individual and the statistical properties only on scales larger than the mean interparticle separation. As a result, we question most numerical results at and below below galaxy scales, either concerning primordial dark matter or baryonic matter coupled to it by gravitation. Mass resolution (specifically, sufficient to have the mean interparticle separation comparable to the smoothing scales) appears be necessary for results to converge.

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