Ruling Out Bosonic Repulsive Dark Matter in Thermal Equilibrium

Understand

Self-interacting dark matter (SIDM), especially bosonic, has been considered a promising candidate to replace cold dark matter (CDM) as it resolves some of the problems associated with CDM.

• Here, we rule out the possibility that dark matter is a repulsive boson in thermal equilibrium.
• We develop the model first proposed by Goodman (2000) and derive the equation of state at finite temperature.
• Isothermal spherical halo models indicate a Bose-Einstein condensed core surrounded by a non-degenerate envelope, with an abrupt density drop marking the boundary between the two phases.