"Within the DM paradigm the Tully-Fisher law must arise from galaxy formation since it connects luminosity of baryonic matter with a dynamical property, rotation, which is seen as dominated by the DM halo. But it has not been easy to derive Tully-Fisher from any natural connection between the two components. And as R. H. Sanders has pointed out, the messiness of galaxy formation is hardly the natural backdrop for such a sharp correlation between galaxy properties. The sharpness needs a dynamical reason as opposed to an evolutionary one."
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Jacob Bekenstein
Jacob Bekenstein (May 1, 1947 – August 16, 2015) was a Mexican-born Israeli-American theoretical physicist, winner of the Wolf Prize in Physics (2012) and the Einstein Prize (2015).
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