CCPP Brown Bag
Hadronically-interacting Dark Matter
If Dark Matter has hadronic interactions with ordinary matter and a mass in the GeV range, scattering from gas in the Galactic disk tends to draw it into co-rotation with the Sun. Limits from direct detection experiments can be evaded, because the relative velocity (and hence energy deposit) is reduced. This scenario provides the first potentially viable explanation for numerous instances of correlation between structure in rotation curves and baryonic density profiles. Constraints on and tests of such a scenario are discussed. A possible 6-quark bound state with mass < 2 m_p is proposed as the DM particle. If it exists, it could naturally have the observed relic abundance, and would not be excluded by laboratory and other constraints. An accelerator experiment to discover it pointed out. Time permitting, the new explanation this may provide for the Baryon Asymmetry of the Universe, will be discussed.