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[Slashdot] - Researcher Discusses Whether Time Travel Could Prevent a Pandemic

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University of Queensland student Germain Tobar who worked with UQ physics professor Fabio Costa on a new peer-reviewed paper "says he has mathematically proven the physical feasibility of a specific kind of time travel" without paradoxes, reports Popular Mechanics: Time travel discussion focuses on closed time-like curves, something Albert Einstein first posited. And Tobar and Costa say that as long as just two pieces of an entire scenario within a closed time-like curve are still in "causal order" when you leave, the rest is subject to local free will... In a university statement, Costa illustrates the science with an analogy "Say you travelled in time, in an attempt to stop COVID-19's patient zero from being exposed to the virus. However if you stopped that individual from becoming infected, that would eliminate the motivation for you to go back and stop the pandemic in the first place. This is a paradox, an inconsistency that often leads people to think that time travel cannot occur in our universe. [L]ogically it's hard to accept because that would affect our freedom to make any arbitrary action. It would mean you can time travel, but you cannot do anything that would cause a paradox to occur...." But the real truth, in terms of the mathematical outcomes, is more like another classic parable: the monkey's paw. Be careful what you wish for, and be careful what you time travel for. Tobar explains in the statement: "In the coronavirus patient zero example, you might try and stop patient zero from becoming infected, but in doing so you would catch the virus and become patient zero, or someone else would. No matter what you did, the salient events would just recalibrate around you. Try as you might to create a paradox, the events will always adjust themselves, to avoid any inconsistency."

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