Spiralicity and Motion on Cosmic Scale
  We hypothesize a simple scenario to associate spiral-shaped trajectories and asymptotic tangential velocities according to observations found on deep space scales. As a difference with alternative Modified Newton Dynamics (MoND), in our scenario the dynamics at cosmic distances depends on the velocity of the rotating galaxy instead of its acceleration. We assume dark matter to exert a quadratic fluid resistance force with an added non-linear drag force in the radial direction. 
E. Canessa
physics.space-ph astro-ph.GA