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“The fun thing is that the outside viewer would see two version of you: One where time was moving forward in time (cracking and frying eggs) and the other moving backward in time (un-stirring the cream in their coffee).” But will such a machine ever exist? Tippet says no. “Our paper included a careful analysis of this geometry, and the problems it would have in being built,” he says. “Generally speaking, backward time travel usually causes singularities (places where there are holes in the universe) or instabilities which would cause them to collapse into a black hole if they get poked the wrong way.
So unfortunately, I don’t foresee this as being feasible." Marika Taylor, professor of theoretical physics at the University of Southampton, commented on the study. She tells Newsweek over email: “Mathematical models for time travel all use the idea of creating shortcuts in a spacetime. In the study the authors explore a version of this idea, bubbles in a spacetime. “However the main problems in all these models are that quantum effects [effects that cannot be explained by classical physics] often destroy the spacetime shortcuts and that exotic forms of matter are required to create the shortcuts.”