I didn't notice this paper, until it was featured today on TR: http://www.technologyreview.com/blog/arxiv/25214/?ref=rss http://arxiv.org/abs/1005.3537 MONDian Dark Matter Chiu Man Ho, Djordje Minic, Y. Jack Ng (Submitted on 19 May 2010) We provide a holographic dual description of Milgrom's scaling associated with galactic rotation curves. Our argument is based on the recent entropic reinterpretation of Newton's laws of motion. We propose a duality between cold dark matter and modified Newtonian dynamics (MOND). We introduce the concept of MONDian dark matter, and discuss some of its phenomenological implications. At cluster as well as cosmological scales, the MONDian dark matter would behave as cold dark matter, but at the galactic scale, the MONDian dark matter would act as MOND.