New Model of Density Distribution for Fermionic Dark Matter Halos

  • A. V. Rudakovskyi Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Sci. of Ukraine; Taras Shevchenko National University of Kyiv; Main Astronomical Observatory, Nat. Acad. of Sci. of Ukraine
  • D. O. Savchenko Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Sci. of Ukraine; Main Astronomical Observatory, Nat. Acad. of Sci. of Ukraine
Keywords: dark matter: warm, cold, dark matter halo profile, cores, Navarro–Frenk–White profile

Abstract

We formulate a new model of density distribution for halos made of warm dark matter (WDM) particles. The model is described by a single microphysical parameter – the mass (or, equivalently, the maximal value of the initial phase-space density distribution) of dark matter particles. Given the WDM particle mass and the parameters of a dark matter density profile at the halo periphery, this model predicts the inner density profile. In the case of initial Fermi–Dirac distribution, we successfully reproduce cored dark matter profiles from N-body simulations. We calculate also the core radii of warm dark matter halos of dwarf spheroidal galaxies for particle masses mFD = 100, 200, 300, and 400 eV.

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Published
2018-09-24
How to Cite
Rudakovskyi, A., & Savchenko, D. (2018). New Model of Density Distribution for Fermionic Dark Matter Halos. Ukrainian Journal of Physics, 63(9), 769. https://doi.org/10.15407/ujpe63.9.769
Section
Fields and elementary particles