On Novel Superfluids Inside Of Dark Matter Halos

We study dark matter models admitting phase transitions to novel superfluid states. We demonstrate that this can occur in broad classes of both fermionic and bosonic dark models, and focus on axion dark matter with higher derivative interactions. These higher derivative terms impact the symmetry breaking phase transition, and are encoded in physical properties of dark matter halos (e.g. the density profile). We identify observable signatures from both the late and early universe, providing a suite of complimentary observable to probe the superfluid nature of dark matter.