Bose-Einstein condensation of dark matter axions.

Abstract

We show that cold dark matter axions thermalize and form a Bose-Einstein condensate (BEC). We obtain the axion state in a homogeneous and isotropic universe, and derive the equations governing small axion perturbations. Because they form a BEC, axions differ from ordinary cold dark matter in the nonlinear regime of structure formation and upon entering the… (More)
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@article{Sikivie2009BoseEinsteinCO, title={Bose-Einstein condensation of dark matter axions.}, author={Pierre Sikivie and Q. Yang}, journal={Physical review letters}, year={2009}, volume={103 11}, pages={111301} }