Multiple Ultralight Axionic Wave Dark Matter and Astronomical Structures

Hoang Nhan Luu; S. -H. Henry Tye; Tom Broadhurst

doi:10.1016/j.dark.2020.100636

paper

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 $m_{1} ≃ 1 0^{- 22}$ 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 $m_{2} ≃ 1 0^{- 20}$ eV, with the possibility of a third axion with mass $m_{3} ≳ 0.5 \times 1 0^{- 18}$ eV. We also argue that the relative mass densities measured for these axions are consistent with their cosmological production via the mis-alignment mechanism.

arXiv commentThe new version includes a dynamical analysis of UFD galaxies and consistency check for cosmic relic abundance

Multiple Ultralight Axionic Wave Dark Matter and Astronomical Structures

Abstract

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