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Self-similar solutions are commonly used to describe Newtonian gravitational collapse. We examine, here, the structure of general-relativistic spherical collapse solutions for a perfect fluid with a barotropic equation of state. We find that these solutions are quite different from the homogeneous Oppenheimer-Snyder dust collapse solution on which our intuition is so heavily based. The most amazing feature that we find is the generic appearance of naked singularities in these solutions.
Ori et al. (Wed,) studied this question.