In the simplest models of DM self-interactions, a Yukawa-type potential and a force carrier φ mediates between two dark matter particles.
Over cosmological time scales this results in isothermal cores in the central region of dark matter haloes.
If the self-interacting dark matter is in hydrostatic equilibrium, its pressure and density follow: where
Self-interacting dark matter has also been postulated as an explanation for the DAMA annual modulation signal.
[6][7][8] Moreover, it is shown that it can serve the seed of supermassive black holes at high redshift.