ar X iv : g r - qc / 9 90 80 76 v 1 3 1 A ug 1 99 9 4 D Wormhole with Signature Change in the Presence of Extra Dimensions
نویسندگان
چکیده
A regular vacuum solution in 5D gravity on the principal bundle with the U (1) structural group is proposed as a 4D wormhole. This solution has two null hypersurfaces where an interchange of the sign of some 5D metric components happens. For a 4D observer living on the base of this principal bundle this is a wormhole with two asymptotically flat Lorentzian (Euclidean) spacetimes connected by a Euclidean (Lorentzian) throat. The 4D Lorentzian observer sees these two null hypersurfaces as electric charges.
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