New model of density distribution for fermionic dark matter halos

TL;DR

This paper introduces a new density distribution model for warm dark matter halos based on a single microphysics parameter, successfully reproducing simulation results and predicting core sizes for dwarf galaxy halos.

Contribution

The paper presents a novel, microphysics-based density profile model for warm dark matter halos that links particle mass to halo structure predictions.

Findings

Reproduces cored profiles from N-body simulations.

Calculates core radii for dwarf spheroidal galaxies.

Models halo density profiles using a single parameter.

Abstract

In this paper, we formulate a new model of density distribution for halos made of warm dark matter (WDM) particles. The model is described by a single microphysics 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 case of initial Fermi-Dirac distribution, we successfully reproduce cored dark matter profiles from N-body simulations. Also, we calculate the core radii of warm dark matter halos of dwarf spheroidal galaxies for particle masses $m_\text{FD}=$100, 200, 300 and 400 eV.