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Journal Article

First simulations of axion minicluster halos


Dolag,  Klaus
Computational Structure Formation, MPI for Astrophysics, Max Planck Society;

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Eggemeier, B., Redondo, J., Dolag, K., Niemeyer, J. C., & Vaquero, A. (2020). First simulations of axion minicluster halos. Physical Review Letters, 125(4): 041301. doi:10.1103/PhysRevLett.125.041301.

Cite as: http://hdl.handle.net/21.11116/0000-0007-1907-6
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.