Abstract

Dark matter is likely to be the main component of the universe, but it doesn’t belong to any part of known substances, which make up the visible celestial bodies. Although dark matter has not been observed directly, there is a large quantity of evidence showing that dark matter does exist. This paper showed several typical candidates and evidence for dark matter and analysed their limitations, including WIMPs, axion, and PBHs. With respect to detection method, Migdal’s effect is used as an example for direct detection and MAGIC telescope for indirect detection. For the observation evidence, the rotation curves, galaxy clusters, and cosmic microwave background are chosen as evidence. According to the analysis, though no dark matter has been already searched till now, it is believed that some promising candidates, (e.g., primordial black holes) exist in the universe. These results shed light on the future research for the property and formation mechanism for dark matter.

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