Dark matter halos: CDM vs 2cDM inelastic dark matter

A multicomponent dark matter (DM) model is a promising paradigm, which has a great potential of resolving longstanding cosmological problems on sub-galactic scales. The simplest two-component DM (2cDM) model with inelastic interactions has been shown, via N-body cosmological DM-only simulations, to robustly resolve the "missing satellites", "core-cusp", and "too-big-to-fail" problems. Here we analytically and numerically investigate the properties of the inner DM halos with an inelastic rate, n〈σv〉, being a nondecreasing function of particle's velocity, v, using the hydrodynamic equations with mass and momentum loss. We found self-similar equilibrium solutions and studied their stability, as well as studied the nonlinear collapse phase. Implications of the obtained results are discussed, in particular to the problem of the early, rapid formation of seeds of supermassive black holes.