Typically, we imagine the universe as being made up of three spatial dimensions and a fourth dimension consisting of time, says Hannah Osborne, but mathematically time is not really separate from those other three dimensions. Instead, according to Ben Tippett at the University of British Columbia, Canada, “all four run together, simultaneously.”
Tippett and David Tsang, an astrophysicist from the University of Maryland, have figured out a mathematical principle that could actually make time travel possible. Their findings have now been published in the journal Classical and Quantum Gravity.
If you were inside the time machine making breakfast, the hands of your wristwatch would be moving forward and you would feel a “persistent acceleration,” Tippet explained. But if you were to look outside, things would get very strange.
“My work was to model a ‘time machine,’ where passengers inside of a box of limited size could travel along a circle through space and time, returning to their own pasts,” Tippett told Newsweek.