Is it theoreticaly possible to phase shift between alternate universe and/or realities?

It's something that's been used several times as a plot device on Star Trek, notably in the TOS episode "The Tholian Web", and the TNG episodes "The Next Phase" and "The Pegasus". I'm certain it's appeared elsewhere as well, but here's my question: Is it theoretically possible, as we currently understand physics, for physical objects to pass from one reality or dimension or phase into another, and back again? It could be through some natural but heretofore undocumented phenomena, or via a technological device. Either is fine. :)

The reason I'm asking this is that for a story I'm working on, I'm hoping to use it as a variation of "The Flying Dutchman" myth, but if the science isn't there it suddenly gets harder to justify. Thanks in advance.

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Is it theoreticaly possible to phase shift between alternate universe and/or realities?

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