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" ... According to models and simulations, all galaxies should be embedded in dark matter halos, whose ... [+] densities peak at the galactic centers. On long enough timescales, of perhaps a billion years, a single dark matter particle from the outskirts of the halo will complete one orbit. The effects of gas, feedback, star formation, supernovae, and radiation all complicate this environment, making it extremely difficult to extract universal dark matter predictions, but the biggest problem may be that the cuspy centers predicted by simulations are nothing more than numerical artifacts. ... "
" ... Dark matter can explain these rotation curves, but it doesn’t do it as well as MOND. The numerical simulations for the halos that the simplest dark matter models produce do not quite match up with the observations; the halos are too “cuspy” in the center and too “fluffy” at the outskirts. (In technical terms, they appear to be more isothermal than we expect.) If these rotation curves were all we had to go on, MOND would be the clear frontrunner. ... "