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Straight out of science fiction: Physicist discovers that paradox-free time travel is mathematically possible

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Illustration: © Getty Images / Maciej Frolow
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A physics student from the University of Queensland in Australia says he has unravelled the maths behind time tinkering and made it 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,” researcher Germain Tobar explained. “However, Einstein’s theory of general relativity predicts the existence of time loops or time travel – where an event can be both in the past and future of itself – theoretically turning the study of dynamics on its head.” 

The researcher used the example of the coronavirus pandemic to explain his incredibly dense math. If a time traveller journeyed to the past to stop the disease from spreading, if they were successful there would have been no disease to send them back to eliminate.

Fabio Costa (left) and Germain Tobar (right). © University of Queensland



However, Tobar’s work found that the virus would still escape in some other way. No matter what the time traveller did, the disease wouldn’t be stopped, so the paradox is removed.

The deeply theoretical work focuses on the influence of deterministic processes on an arbitrary number of regions in the space-time continuum. Tobar demonstrated how both closed timelike curves (which were predicted by Albert Einstein) can fit in with the rules of free will and classical physics. 

“The maths checks out – and the results are the stuff of science fiction,” said physicist Fabio Costa from the University of Queensland, who supervised the research.

Tobar’s study was published in the Classical and Quantum Gravity journal.

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