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Axion as a Cold Dark Matter candidate · Around

2009

Axion as a Cold Dark Matter candidate

Hwang, Jai-chan, Noh, Hyerim

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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.

Built on

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Similar

J. Preskill, M. B. Wise, and F. Wilczek, Phys. Lett. B 120 (1983) 127; L.F. Abbott and P. Sikivie, Phys. Lett. B 120 (1983) 133; M. Dine and W. Fischler, Phys. Lett. B 120 (1983) 137; J.E. Kim, Phys. Rep. 150 (1987) 1
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B. Ratra, Phys. Rev. D 44 (1991) 352
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Cited alongside, same era.
J.M. Bardeen, Particle Physics and Cosmology
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Cited alongside, same era.
P. Sikivie and Q. Yang, arXiv:0901.1106v2 [hep-ph]
Original
Cited in the paper.

Then

J. Hwang, Phys. Lett. B 401 (1997) 241
1997
Later among the works it cites.
J. Hwang and H. Noh, Gen. Rel. Grav. 31 (1999) 1131
1999
Later among the works it cites.
H. Noh and J. Hwang, Class. Quant. Grav. 22 (2005) 3181
2005
Later among the works it cites.

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