So what happens to the matter in the space that has been vacated/occupied by the time travelling entity?
It's shunted aside or turned into photons or whatever. I guess you'd want to evacuate the receptacle so you haven't got air molecules flying around when your time traveller arrives.
https://en.m.wikipedia.org/wiki/Mass–energy_equivalence
@frankenbike started
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So what happens to the matter in the space that has been vacated/occupied by the time travelling entity?