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Published on: November 12, 2014
First Simulations of Axion Minicluster Halos
Benedikt Eggemeier1, Javier Redondo2,3, Klaus Dolag4,5
1Institut für Astrophysik, Georg-August-Universität Göttingen, D-37077 Göttingen, Germany.
Abstract:
We study the gravitational collapse of axion dark matter fluctuations in the postinflationary scenario, so-called axion miniclusters, with N-body simulations. Largely confirming theoretical expectations, overdensities begin to collapse in the radiation-dominated epoch and form an early distribution of miniclusters with masses up to 10^{-12} M_{⊙}. After matter-radiation equality, ongoing mergers give rise to a steep power-law distribution of minicluster halo masses. The density profiles of well-resolved halos are Navarro-Frenk-White-like to good approximation. The fraction of axion dark matter in these bound structures is ∼0.75 at redshift z=100.
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