We review a new traversable-wormhole solution of the gravitational field equation of general relativity without exotic matter.Instead of having exotic matter to keep the wormhole throat open, the solution relies on a 3-dimensional "spacetime defect," which is characterized by a locally vanishing metric determinant.We also discuss the corresponding multiple-vacuumdefect-wormhole solution and possible experimental signatures from a "gas" of vacuum-defect wormholes.Multiple vacuum-defect wormholes appear to allow for backward time travel.
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F. R. Klinkhamer (2024) studied this question.
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