Dark Matter Superfluidity

Abstract

In these lectures I describe a theory of dark matter superfluidity developed in the last few years. The dark matter particles are axion-like, with masses of order eV. They Bose-Einstein condense into a superfluid phase in the central regions of galaxy halos. The superfluid phonon excitations in turn couple to baryons and mediate a long-range force (beyond Newtonian gravity). For a suitable choice of the superfluid equation of state, this force reproduces the various galactic scaling relations embodied in Milgrom's law. Thus the dark matter and modified gravity phenomena represent different phases of a single underlying substance, unified through the rich and well-studied physics of superfluidity.

arXiv comment21 pages, 1 figure, Submitted to SciPost Physics Lecture Notes, Les Houches Summer School Series. v2: corrected typos and added references

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Cited by in corpus (7)

• A statistical investigation of the mass discrepancy-acceleration relation
• Unified Superfluid Dark Sector
• A Universe Without Dark Energy: Cosmic Acceleration from Dark Matter-Baryon Interactions
• The Equation of State of Dark Matter Superfluids
• Baryon-Interacting Dark Matter: heating dark matter and the emergence of galaxy scaling relations
• Science from an Ultra-Deep, High-Resolution Millimeter-Wave Survey
• CMB-HD: An Ultra-Deep, High-Resolution Millimeter-Wave Survey Over Half the Sky