An Excessive Core Collapse and Its Implication

Details An Excessive Core Collapse and Its Implication An Excessive Core Collapse and Its Implication

2010-03-23

arxiv.org/abs/1003.4346v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, submitted to MNRAS

Scientific paper

The particle mass used in cosmology N-body simulations is close to 10^10\Msun, which is about 10^65 times larger than the GeV scale expected in particle physics. However, self-gravity interacting particle systems made up of different particles mass have different statistical and dynamical properties. Here we demonstrate that, due to this particle mass difference, the nowaday cosmology N-body simulations can have introduced an excessive core collapse process, especially for the low mass halos at high redshift. Such dynamical effect introduces an excessive cuspy center for these small halos, and it implies a possible connection to the so called "small scale crisis" for CDM models. Our results show that there exist a physical limit in cosmological simulations, and we provide a simple suggestion based on it to relieve those effects from the bias.

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