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The particle mass used in cosmology N-body simulations is close to$10^{8}M_{\odot}$, which is about $10^{65}$ times larger than the GeV scaleexpected in particle physics. However, self-gravity interacting particlesystems made up of different particles mass have different statistical anddynamical properties. Here we demonstrate that, due to this particle massdifference, the nowaday cosmology N-body simulations can have introduced anexcessive core collapse process, especially for the low mass halos at highredshift. Such dynamical effect introduces an excessive cuspy center for thesesmall halos, and it implies a possible connection to the so called "small scalecrisis" for CDM models. Our results show that there exist a physical limit incosmological simulations, by using about $10^3$ particles to describe smallesthalos, and we provide a simple suggestion based on it to relieve those effectsfrom the bias.

An Excessive Core Collapse in Nbody Cosmological simulations