Multiple Ultralight Axionic Wave Dark Matter and Astronomical Structures
arXiv:1811.03771 · doi:10.1016/j.dark.2020.100636
Abstract
An ultralight scalar boson with mass eV is gaining credence as a Dark Matter (DM) candidate that explains the dark cores of dwarf galaxies as soliton waves. Such a boson is naturally interpreted as an axion generic in String Theory, with multiple light axions predicted in this context. We examine the possibility of soliton structures over a wide range of scales, accounting for galaxy core masses and the common presence of nuclear star clusters. We present a diagnostic soliton core mass-radius plot that provides a global view, indicating the existence of an additional axion with mass eV, with the possibility of a third axion with mass eV. We also argue that the relative mass densities measured for these axions are consistent with their cosmological production via the mis-alignment mechanism.
The new version includes a dynamical analysis of UFD galaxies and consistency check for cosmic relic abundance