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Axion Stars
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The particle that makes up the dark matter of the universe could be an axion or axion-like particle. A collection of axions can condense into a bound Bose-Einstein condensate called an axion star. It is possible that a significant fraction of the axion dark matter is in the form of axion stars. This would make some efforts to identify the axion as the dark matter particle more challenging, but it would also open up new possibilities. We summarize the basic properties of isolated axion stars, which can be gravitationally bound or bound by self-interactions. Axions are naturally described by a relativistic field theory with a real scalar field, but low-energy axions can be described more simply by a classical nonrelativistic effective field theory with a complex scalar field.
Forward citations
Cited by 2 Pith papers
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Nonrelativistic Proca stars: Spherical stationary and multi-frequency states
Nonrelativistic Proca stars have a ground state with constant polarization (linear or circular depending on the sign of the spin-spin coupling), and a symmetry-enhanced sector with λs=0 contains a continuum of multi-f...
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Preheating Axions in String Cosmology
Preheating of closed-string axions in fibre inflation can overproduce dark matter, yielding new upper bounds on the axion mass and constraints on model parameters.
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