We show that it is not possible to smooth out the metric on the Deutsch-Politzer time machine to obtain an everywhere nonsingular asymptotically flat Lorentzian metric.
DOI:https://doi.org/10.1103/PhysRevD.50.R2353
©1994 American Physical Society
Andrew Chamblin, G. W. Gibbons, and Alan R. Steif
Vol. 50, Iss. 4 — 15 August 1994
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