Thermalization, Fragmentation and Tidal Disruption: The Complex Galactic Dynamics of Dark Matter Superfluidity

Understand

The idea of self-interacting bosonic dark matter capable of exhibiting superfluidity is revisited.

• We show that the most interesting parameter space of the theory corresponds to fully thermalized dark matter halos.
• As a result the entire halo undergoes Bose-Einstein condensation due to high degeneracy.
• Since it is observationally preferable for the dark matter density profile to be similar to cold dark matter in the outskirts of the halo, we argue that the Jeans wavelength must be at least few times shorter than the virial radius.