Alternative dark matter candidates: Axions
February 27, 2017
June 20, 2017
The axion is arguably one of the best motivated candidates for dark matter.
For a decay constant $\gtrsim 10^9$ GeV, axions are dominantly produced
non-thermally in the early universe and hence are ``cold", their velocity dispersion
being small enough to fit to large scale structure. Moreover, such a large decay
constant ensures the stability at cosmological time scales
and its behaviour as a collisionless fluid at cosmological length scales.
Here, we review the state of the art of axion dark matter predictions and
of experimental efforts to search for axion dark matter in laboratory experiments.
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