The halo model for dark matter encounters continually lethal problems as I have repeatedly tried to tell in my blog postings and articles. But still this model continues to add items to the curriculum vitae of the specialists - presumably as long as the funding continues. Bad ideas never die.
Halo model predicts that the dwarf galaxies around massive galaxies like Milky should move randomly. The newest fatal blow comes from the observation that dwarf galaxies move along neat circular orbits in the galactic plane of Centaurus A.
Just like the TGD based pearls-in-necklace model of galaxies as knots (the pearls) of long cosmic strings predicts! The long cosmic string creates gravitational field in transversal direction and the dwarf galaxies move around nearly circular orbits. The motion along long cosmic string would be free motion and would give rise to streams. The prediction is that at large distances the rotational velocities approach constant just as in the case of distant stars.
Somehow it seems impossible for colleagues to get the heureka that dark matter could be concentrated along string like structures. Why this is so difficult, remains a mystery to me. I have been now waiting this discovery (and many other discoveries) for more than two decades but in vain.
For TGD based model of galaxies see for instance this .
See the chapter TGD and astrophysics of "Physics in Many-sheeted Space-time".
For a summary of earlier postings see Latest progress in TGD.