Abstract
Abstract The absence of dark matter (DM) in stars is interpreted as an important constraint on its allowable kinematics rather than implying extremely small cross sections. A model for the motions of DM particles in the vicinity of stars and spiral galaxies is developed assuming internal motions in a DM particle can couple to its translational motion. A DM particle having rapid “spin” must move in a tight helix around its guiding center world line, in a manner similar to an ion moving in a magnetic field. Compared to ordinary matter particles, DM particles cannot enter deep gravitational wells because their total angular momentum is too high. Numerical examples seem reasonable. It is very doubtful that this DM can be found in the solar system, or be present in stars or protostars, or be found in the interior regions of galaxies.
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