The math involved in all of this is enough to make Will Hunting scratch his head, but Tobar, like another Matt Damon character, has been able to “science shit” out of theorizing how to travel through time without causing the annoying logical paradoxes that begevil many a science-fiction protagonist.One such example is the so-called grandfather paradox, in which, as their paper puts it, “a time traveler could kill her own grandfather and thus prevent her own birth, leading to a logical inconsistency.” Or someone who goes back in time to prevent the COVID-19 pandemic from happening would then nixe the very reason why they ever traveled through time. Yes, it’s like the arguments about time travel in Avengers: Endgame again!
“This is a paradox – an inconsistency that often leads people to believe that time travel cannot occur in our universe,” Costa said. “Some physicists say it is possible, but it is logically difficult to accept because it would affect our freedom to take any arbitrary action. That would mean you can travel in time, but you can not do anything that could cause a paradox to arise. ”
Tobar basically said, hold my beer and went around proving that one can theoretically travel through time, exercise free will and not create such logical paradoxes.
Because classical dynamics and Einstein’s theory of relativity contradict each other in the case, Tobar’s paper calculated how closed time-like curves (CTCs) “are not only compatible with determinism and with the local ‘free choice’ of operations, but also with a rich and diverse range of scenarios and dynamic processes. “
Or as popular mechanics briefly puts it, “as long as only two pieces of an entire scenario within a CTC are still in ‘causal order’ when you leave, the rest is subject to local free will.”
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Tobar’s calculations show how theoretically one could travel and exercise free will in a way that would not prevent the reason why they went back in time. But it could make them wish they had never traveled in time to begin with:
“In the coronavirus patient’s zero example, you can try to prevent patient-zero from becoming infected, but by doing so you would catch the virus and become patient zero, or someone else would. calibrate around you. Try as you might create a paradox, events will always adjust themselves to avoid inconsistency. “
In the words of the venerable time travel experts Bill S. Preston, Esq. and Ted “Theodore” Logan: False!
For more scientific coverage, learn about the possibility of life on Venus, evidence for a parallel universe where time runs backwards, why the moon rusts, and the discovery of underground lakes on Mars.