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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.

Physical Review Letters
|August 16, 2020
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Summary
This summary is machine-generated.

Axion dark matter fluctuations collapse to form miniclusters in the early universe. These structures merge, creating a power-law mass distribution, with 75% of axion dark matter bound by redshift 100.

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Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • Axion dark matter is a leading candidate for non-baryonic dark matter.
  • Axion miniclusters are predicted to form from primordial density fluctuations of axions.
  • Understanding their formation and evolution is crucial for dark matter studies.

Purpose of the Study:

  • To investigate the gravitational collapse of axion dark matter fluctuations.
  • To characterize the formation and mass distribution of axion miniclusters using N-body simulations.
  • To determine the abundance of axion dark matter within these structures at early times.

Main Methods:

  • Utilized large-scale N-body simulations to model the dynamics of axion dark matter.
  • Tracked the collapse of overdensities in the post-inflationary, radiation-dominated epoch.
  • Analyzed halo properties, including mass distribution and density profiles.

Main Results:

  • Confirmed theoretical predictions of early collapse forming miniclusters with masses up to 10^-12 M☉.
  • Observed ongoing mergers after matter-radiation equality, leading to a steep power-law mass distribution.
  • Found that well-resolved halos exhibit Navarro-Frenk-White-like density profiles.
  • Determined that approximately 75% of axion dark matter resides in bound structures by redshift z=100.

Conclusions:

  • Axion miniclusters form efficiently in the early universe and evolve through mergers.
  • The simulated minicluster properties align well with theoretical expectations and observational constraints.
  • This study provides key insights into the nature and distribution of axion dark matter in the early cosmos.