http://arxiv.org/abs/1811.03771
An ultralight scalar boson with mass $m_1 \simeq 10^{-22}$ 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 $m_2\simeq 4 \times 10^{-20}$ eV, with the possibility of a third axion with mass $m_3 \gtrsim 6 \times 10^{-18}$ eV.
T. Broadhurst, H. Luu and S. Tye
Mon, 12 Nov 18
41/68
Comments: 7 pages, 4 figures
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