Dark Halos around Spirals; no role for collisionless Cold Dark Matter particles

From the analysis of high–quality optical rotation curves of 9 low–luminosity disk galaxies, we find that the properties of the dark halos around these objects are inconsistent with the halo density profile of the halos emerging in high resolution Cold Dark Matter N-body simulations. Dark halos around galaxies are almost constant density spheres, very different from the characteristic CDM ρ(r) ∝ r halos. This obviously challenges the theory (when the relevant particle is non–interacting), also because we find that the dark halo densities in the optical regions of spirals are unrelated to halos global properties, at gross variance with what it automatically occurs within this theory.