Abstract
The standard model of cosmology shows that there is about 26.8% dark matter in the universe. Although many dark matter models have been proposed, the nature of dark matter is still not clear at present. There are two major candidates for dark matter, dark matter particles and primordial black holes. However, it is difficult to distinguish these two kinds of dark matter models by using the gravitational lensing effect of dark matter. Based on the influence of dark matter on asteroid motion, we find that if dark matter is composed of particles, its influence on asteroid motion is very weak. If the dark matter is composed of primordial black holes, it may produce observational effect. Therefore, dark matter particles and primordial black holes can be distinguished by observing the trajectory of asteroids if there is a primordial black hole or more at the edge of the solar system.
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