Axion as a Cold Dark Matter candidate

Details Axion as a Cold Dark Matter candidate Axion as a Cold Dark Matter candidate

2009-02-27

arxiv.org/abs/0902.4738v1

Phys.Lett.B680:1-3,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, no figure

Scientific paper

10.1016/j.physletb.2009.08.031

Here we generally prove that the axion as a coherently oscillating scalar field acts as a cold dark matter in nearly all cosmologically relevant scales. The proof is made in the linear perturbation order. Compared with our previous proof based on solutions, here we compare the equations in the axion with the ones in the cold dark matter, thus expanding the valid range of the proof. Deviation from purely pressureless medium appears in very small scale where axion reveals a peculiar equation of state. Our analysis is made in the presence of the cosmological constant, and our conclusions are valid in the presence of other fluid and field components.

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