Does the Observed Phase Space Density of Dwarf Galaxies Indicate a Consistent Value for the Mass of the Dark Matter Particle?

Recent studies have suggested that the phase space densities (Q) of Milky Way dwarf satellite galaxies imply a keV-scale dark matter particle mass. To go beyond this order-of-magnitude estimate, we examine trends in the phase space density data and consider their implications for the relationship between the primordial Q ($Q_P$), which depends directly on the dark matter particle mass, and the presently observed values of Q ($Q_0$). We then determine whether the application of a consistent $Q_P$-$Q_0$ relationship to the $Q_0$ data yields a consistent and more well-defined value of the dark matter particle mass.