Axion Miniclusters and Bose Stars
Abstract
Evolution of inhomogeneities in the axion field around the QCD epoch is studied numerically, including for the first time important non-linear effects. It is found that perturbations on scales corresponding to causally disconnected regions at T 1 \, GeV can lead to very dense axion clumps, with present density a 10-8\, g \, cm-3. This is high enough for the collisional 2a → 2a process to lead to Bose--Einstein relaxation in the gravitationally bound clumps of axions, forming Bose stars.
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