Singular disk of matter in the Cooperstock-Tieu galaxy model

Abstract

Recently a new model of galactic gravitational field, based on ordinary General Relativity, has been proposed by Cooperstock and Tieu in which no exotic dark matter is needed to fit the observed rotation curve to a reasonable ordinary matter distribution. We argue that in this model the gravitational field is generated not only by the galaxy matter, but by a thin, singular disk as well. The model should therefore be considered unphysical.

arXiv comment5 pages, no figures; minor linguistic corrections, minor corrections in equations 17, 18 and 20

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