Abstract
The objective of this brief comment is to point out several problems associated with the general framework underpinning the letter `Scalar fields as dark matter in spiral galaxies' (Matos T and Guzman S 2000 Class. Quantum Grav. 17 L9) and with its application in this work in particular. Concretely we will focus on three points, namely, the singularity of the scalar field configuration, the analysis of the geodesics and the way in which the authors `add' velocities in trying to account for the effects of the luminous mass on the motion of the test particles.
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