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 Terminator, Donnie Darko, Back 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 a few years ago physics student Germain Tobar, from the University of Queensland in Australia, 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,” Tobar explained back in 2020.
“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.”
What the calculations show is that space-time can potentially adapt itself to avoid paradoxes.
To use a topical example, imagine a time traveler journeying into the past to stop a disease from spreading – if the mission was successful, the time traveler would have no disease to go back in time to defeat.
As movies such as The Terminator, Donnie Darko, Back 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 a few years ago physics student Germain Tobar, from the University of Queensland in Australia, 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,” Tobar explained back in 2020.
“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.”
What the calculations show is that space-time can potentially adapt itself to avoid paradoxes.
To use a topical example, imagine a time traveler journeying into the past to stop a disease from spreading – if the mission was successful, the time traveler would have no disease to go back in time to defeat.
The research smoothed out the problem with another hypothesis, that time travel is possible but that time travelers would be restricted in what they did, to stop them creating a paradox. In this model, time travelers have the freedom to do whatever they want, but paradoxes are not possible.
While the numbers might work out, actually bending space and time to get into the past remains elusive – the time machines that scientists have devised so far are so high-concept that for they currently only exist as calculations on a page.
We might get there one day – Stephen Hawking certainly thought it was possible – and if we do then this new research suggests we would be free to do whatever we wanted to the world in the past: it would readjust itself accordingly.
“Try as you might to create a paradox, the events will always adjust themselves, to avoid any inconsistency,” said Costa.
“The range of mathematical processes we discovered show that time travel with free will is logically possible in our Universe without any paradox.” [Classical and Quantum Gravity].
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The University of Queensland is smoking crack. If someone goes back in time with full intent and purpose to kill their grandparents, are we supposed to believe that some magical force will drop pianos in the way to prevent it? Such a force would necessitate omnipresence and intelligence. Sorry Queensland, you’re going to need to do more than just magical hand waving.
Time travel and time tampering are possible when one, you own a device and two, your name is CERN