Novel Substructure and Superfluid Dark Matter. (arXiv:1901.03694v1 [astro-ph.CO])

Novel Substructure and Superfluid Dark Matter. (arXiv:1901.03694v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Alexander_S/0/1/0/all/0/1">Stephon Alexander</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bramburger_J/0/1/0/all/0/1">Jason J. Bramburger</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McDonough_E/0/1/0/all/0/1">Evan McDonough</a>

The recent observation of the distribution of accreted stars (SDSS-Gaia DR2)
suggests that a non-trivial fraction of dark matter is contained within halo
substructure. With this in mind, in this letter we construct novel solutions to
the equations of motion governing condensate dark matter candidates, namely
axion Bose-Einstein condensates and superfluids. These solutions are highly
compressed along one axis and thus have a disk-like geometry. We discuss linear
stability of these solutions, consider the astrophysical implications as a
large-scale dark disk or small scale substructure, and find a characteristic
signal in strong gravitational lensing. If observed, such substructure is a
smoking gun signal of condensate models of dark matter. This indicates that
dark matter substructure is a powerful new observable window for testing the
nature of dark matter.

The recent observation of the distribution of accreted stars (SDSS-Gaia DR2)
suggests that a non-trivial fraction of dark matter is contained within halo
substructure. With this in mind, in this letter we construct novel solutions to
the equations of motion governing condensate dark matter candidates, namely
axion Bose-Einstein condensates and superfluids. These solutions are highly
compressed along one axis and thus have a disk-like geometry. We discuss linear
stability of these solutions, consider the astrophysical implications as a
large-scale dark disk or small scale substructure, and find a characteristic
signal in strong gravitational lensing. If observed, such substructure is a
smoking gun signal of condensate models of dark matter. This indicates that
dark matter substructure is a powerful new observable window for testing the
nature of dark matter.

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