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2018

Multiple Ultralight Axionic Wave Dark Matter and Astronomical Structures

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

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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 $m_2\simeq 10^{-20}$ eV, with the possibility of a third axion with mass $m_3 \gtrsim 0.5 \times 10^{-18}$ eV.

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