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By adding the trivial term -dt^2 one can convert the four-dimensional (positive-definite) Newman-Unti-Tamburino line element into a static solution of the five-dimensional vacuum Einstein equations. Interpreted `ala Kaluza and Klein, the solution describes a monopole with a charge-to-mass ratio of 2 in rationalized Planck units. Although it is a perfectly regular five-geometry it appears singular from a four-dimensional perspective.
Rafael D. Sorkin (Mon,) studied this question.
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