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Science & Technology

Physicist solves time travel paradox problem

By T.K. Randall
September 28, 2020 · Comment icon 15 comments

Is it really possible to travel backwards through time ? Image Credit: Pixabay / TheDigitalArtist
Physics student Germain Tobar has come up with the mathematics for what he calls 'paradox-free' time travel.
From 'Doctor Who' to 'Back to the Future', time travel has been a staple science-fiction technology in movies, books and TV shows for years. But could it really be possible to travel into the past ?

One of the longest-standing problems when it comes to time travel is the paradox - a concept that would seem to make the idea of changing events in the past a total impossibility.

As an example, imagine traveling into the past to stop a deadly disease. If you succeeded, there wouldn't have been a disease to travel back in time to stop - hence the paradox.

Now though, physics student Germain Tobar from the University of Queensland in Australia believes that he has come up with the mathematics necessary to avoid paradoxes entirely.

According to his calculations, space-time is actually capable of adapting itself to avoid them from happening. In the example mentioned above, this could manifest as the disease breaking out regardless of efforts to travel back in time to stop it, thus making it an inevitable occurrence.
"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," said Tobar.

"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."

Of course all of this is purely hypothetical - it remains to be seen whether or not time travel is actually possible and even it is, it isn't certain how it would work and whether or not things could be changed.

Tobar's work on the subject however has at least proven to be quite compelling

"The maths checks out - and the results are the stuff of science fiction," said physicist Fabio Costa.

Source: Science Alert | Comments (15)

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Recent comments on this story
Comment icon #6 Posted by jpeniel333 4 years ago
At this point, I am entirely convinced that "Physicists" is another word for "Glorified and Advanced Morons".
Comment icon #7 Posted by jpeniel333 4 years ago
Comment icon #8 Posted by acute 4 years ago
YEP! Constant revision of events, with an unfathomable number of decision points, yet we only perceive one result.
Comment icon #9 Posted by jpeniel333 4 years ago
Comment icon #10 Posted by acute 4 years ago
Why not? Please explain.
Comment icon #11 Posted by jpeniel333 4 years ago
Because nothing larger than a single subatomic particle can travel through time (forward or backward) due to the commonly forgotten factor of timespace expansion D(2.4x10^18)^s.  Any attempt to arrive in the past or the future would create an immediate misalignment of atomic structure resulting in an explosion similar or larger than that of the Tunguska event.  Travel through the use of Quantum entanglement is probably possible via information exchange only but this would not allow visible changes to time 'less those changes were duplicated even of a different internal nature. (for example,... [More]
Comment icon #12 Posted by Cosmic Horror 4 years ago
I don’t see it being a truly viable thing.  If there are separate universes that correlate to different instances in time there would have to be an infinite amount of these universes.  Further to this, would there be intervals?  As in, would there be a new universe say for every second, or millisecond, and then there would be universes sprouting of the alternate universe.  It’s too messy. The alternative is that the alternate branching universe is created at the moment you initiate time travel, meaning that an entire universe is created out of nothing, which would be... Rather problema... [More]
Comment icon #13 Posted by jpeniel333 4 years ago
Perhaps the problem is that people are unaware of how timespace actually works; whereas time is not linear insomuch as one's perspectives and perceptions are.  If the universe had to be created from something (otherwise you get something from nothing) then perhaps the universe is self-created by an alternate view of timespace other words, time is not as linear as you think.  It expands into both past and future simultaneously (as results from the double slit experiment has even demonstrated).  This is to say that, in the quantum world, there is no cause and effect...  there is "cause... [More]
Comment icon #14 Posted by SmartAZ 4 years ago
If you travel back in time, how fast do you travel? To travel in time requires time to exist in at least two dimensions. Time must exist in at least three dimensions so you can avoid colliding with other travelers. Get back to us when you observe such a thing.
Comment icon #15 Posted by quiXilver 4 years ago
Time is not a thing. No one travels through time.  Time has no direction.   Time is a function of human memory and is based on comparison of memory and current perceptual input. It is a function of our perceptual modeling process.  There is only awareness... unfolding in presence.   There is only now.  Every thought you've ever had, was in the now. Every thing you remember doing, you're remembering it now. When you were doing it, you were doing it in the now. Every time you plan for, or consider the future, you do it now.   Now is what is unfolding within awareness.  This is what is. In... [More]

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