Journal
PHYSICS OF THE DARK UNIVERSE
Volume 12, Issue -, Pages 50-55Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.dark.2016.02.003
Keywords
Dark matter; Ultralight axions; Solitons
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Funding
- Ministerio de Ciencia e Innovacion [FIS2014-58117-P, FIS2014-61984-EXP]
- Xunta de Galicia [EM2013/002]
- Ramon y Cajal program
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By performing numerical simulations, we discuss the collisional dynamics of stable solitary waves in the Schrodinger-Poisson equation. In the framework of a model in which part or all of dark matter is a Bose-Einstein condensate of ultralight axions, we show that these dynamics can naturally account for the relative displacement between dark and ordinary matter in the galactic cluster Abell 3827, whose recent observation is the first empirical evidence of dark matter interactions beyond gravity. The essential assumption is the existence of solitonic galactic cores in the kiloparsec scale. For this reason, we present simulations with a benchmark value of the axion mass m(a) = 2 x 10(-24) eV, which is somewhat lower than the one preferred for cosmological structure formation if the field is all of dark matter (m(a) approximate to 10(-22) eV). We argue that future observations might bear out or falsify this coherent wave interpretation of dark matter offsets. (C) 2016 The Authors. Published by Elsevier B.V.
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