Dark Matter, Discreteness and Collision Error in Cosmological NBody Simulations
Abstract
We report on a series of tests of agreement between three types of Nbody 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.
 Publication:

arXiv eprints
 Pub Date:
 November 1997
 DOI:
 10.48550/arXiv.astroph/9711105
 arXiv:
 arXiv:astroph/9711105
 Bibcode:
 1997astro.ph.11105S
 Keywords:

 Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 Latex, 12 pages, with 3 figures