Home Science Time travel is mathematically possible but still unrealistic – What’s missing?

Time travel is mathematically possible but still unrealistic – What’s missing?

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The good news is that, from a mathematical point of view, we can travel in the past. The bad news is that basically this is not possible.

TARDIS is what the time machine is called in the Doctor Who series, but it’s also the name of this gadget “used” by physicists. Here, TARDIS stands for Traversable Acausal Retrograde Domain in Space-time, writes Curiosity.

In essence, the theory refers to space-time curvature. The two researchers, David Tsang and Ben Tippet, who conducted this study, argue that “the four dimensions (the three spatial dimensions + time) can be imagined to be connected, so the (theoretically) time can be curved in a circle like on the below image.

If you could enter the time machine, you would feel a persistent acceleration and the clock would move forward. But if you were looking outside the gadget (TARDIS), you would see time going backwards. Those outside would see two versions of the person inside: one moving forward in time and one moving backward.

It sounds too good to be true. The machine should be fed with an “exotic matter” that was not (yet) found in nature. Tippet states that “although mathematically feasible, it is not yet possible to build a time machine.”