"Astronomical Clock, Prague" by Jay8085 / CC BY 2.0

A Physicist Has Come Up With Math That Makes ‘Paradox-Free’ Time Travel Plausible

Sep 28, 2020

By David Nield

No one has yet managed to travel through time – at least to our knowledge – but the question of whether or not such a feat would be theoretically possible continues to fascinate scientists.

As movies such as The TerminatorDonnie DarkoBack to the Future and many others show, moving around in time creates a lot of problems for the fundamental rules of the Universe: if you go back in time and stop your parents from meeting, for instance, how can you possibly exist in order to go back in time in the first place?

It’s a monumental head-scratcher known as the ‘grandfather paradox’, but now a physics student Germain Tobar, from the University of Queensland in Australia, says he has worked out how to “square the numbers” to make time travel viable without the paradoxes.

“Classical dynamics says if you know the state of a system at a particular time, this can tell us the entire history of the system,” says Tobar.

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