A physicist has applied mathematics to make ‘paradox-free’ time travelable


No one has yet managed to travel through time – at least to our knowledge – but the question of whether such a valor is theoretically possible to fascinate scientists.

Movies like the Terminator, Donnie Darko, Back to the future And as many others point out, moving around over time creates a lot of problems for the basic rules of the universe: if you go back in time and prevent your parents from meeting, for example, going back in time How could you possibly exist in the first place?

It’s a monumental head-scratching, known as the ‘Grandfather Paradox’, but in September last year Jermaine Tobar, a physics student from the University of Queensland, Australia, said she had “taken the numbers” to make time travel workable Class “. Without contradictions.

Tobar stated in September 2020, “Classical dynamics say that if you know the state of a system at a particular time, it can tell us the complete history of the system.”

“However, Einstein’s theory of general relativity predicts the existence of time loops or time travel – where an event can occur in both the past and the future – theoretically turning the study of dynamics on its head.”

What the calculations show is that space-time can possibly adapt itself to avoid contradictions.

To use an occasional example, imagine a time traveler traveling in the past to prevent a disease from spreading – if the mission was successful, the time traveler would have no illness to return to at the time of defeat.

Tobar’s work suggests that the disease will still overcome the contradiction, in some other way, through a different route or by a different method. Whatever time traveler did, the disease would not stop.

Tobar’s work is not easy to dig into for non-mathematicians, but it looks at the effect of deterministic processes (without any randomness) on an arbitrary number of fields in the space-time continuum, and shows that both time-bound curves. (As predicted by Einstein) may fit with the laws of free will and classical physics.

“Mathematics checks – and the results are similar to science fiction,” said physicist Fabio Costa of the University of Queensland, who supervised the research.

Fabio Costa (left) and Jermaine Tobar (right). (Ho wu)

New research settles the problem with another hypothesis, that time travel is possible but travelers will be restricted to stop creating contradictions in what they did at the time. In this model, time travelers have the freedom to do anything they wish, but contradiction is not possible.

While numbers can work out, bending space and time to actually get into the past is elusive – the time machines scientists have designed so far are so highly-conceptualized that currently they are only on one page of calculations Exist in the form.

We can get there one day – Stephen Hawking certainly thought it was possible – and if we do then this new research suggests that we in the world are free to do whatever we wanted to do in the past Will: It would be unfair on its own accordingly.

“As you can try to create contradictions, events will always adjust themselves, to avoid any inconsistencies,” Costa says. “The mathematical processes we discovered show that time travel is logically possible with free will in our universe without contradiction.”

The research has been published in Classical and quantum gravity.

A version of this article was first published in September 2020.

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