Dark Matter Superfluidity and Galactic Dynamics

by Lasha Berezhiani (Max Planck Institute for Physics)

Thursday 19 Dec 2024, 16:00 → 18:00 Australia/Sydney

After a brief overview of empirical correlations between dark and baryonic sectors within galaxies, I will discuss a theory of dark matter superfluidity as a potential explanation of this observation. One of the ideas is to have an emergent long-range interaction between baryons mediated by superfluid phonons. To support this claim on emergent forces, I will demonstrate the effect using an explicit toy model. In particular, I will show that in a theory with a mass-gap, there are emergent long-range interactions upon Bose-Einstein condensation. Setting aside this exotic feature, I will show on the example of a vanilla self-interacting scalar dark matter model that dark matter halos might indeed have an interesting superfluid substructure with phenomenological implications.