Abstract
Self-interacting vectors are seeing a burst of interest where various groups demonstrated that the field evolution ends in finite time. Two nonequivalent criteria have been offered to identify this breakdown: (i)the vector constraint equation cannot be satisfied beyond a point where the breakdown occurs, (ii)the dynamics is governed by an effective metric that becomes singular at the breakdown. We show that (i)identifies a coordinate singularity, and can be removed by a change of coordinates. Hence, it does not signify a physical problem, and cannot determine the validity of a theory.
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