First of all, let’s make it clear: time travel, with our current technology and knowledge, is not possible. This does not prevent scientists from elaborating theories on how to make them real, or trying to develop solutions to the problems that the concept presents, such as the “grandpa paradox”.
Anyone who has watched “Back to the Future” knows the concept: Marty McFly goes back in time, to the 50s, where he accidentally prevents the first meeting of his father and his mother. As a result, he runs the risk of “disappearing” (represented by a photo of him with his family, where he gradually fades away) and needs to fix the timeline and reunite his parents before it is too late.
A proposed solution would be to consider an “immutable” past, where the traveler is somehow prevented from carrying out actions that may result in a paradox, that is, he has no free will. A concept that is difficult to accept, since any action in the past could have unforeseen consequences in the future.
A physics student named Germain Tobar, from the University of Queensland, Australia, published an article in which he claims to have arrived at a mathematical model that solves the problem. Without going into details, according to him, spacetime can “adapt” to avoid these paradoxes.
Tobar’s work was supervised by Dr. Fabio Costa, from the University of Queensland. According to him, the calculations can have “fascinating” consequences for science. “Solid mathematics – and the results look like scientific fiction,” said Dr. Costa.
“Let’s say you have traveled back in time in an attempt to prevent COVID-19 zero patient from being exposed to the virus,” said Tobar. “However, if you prevented that individual from being infected, that would eliminate the motivation for you. go back and stop the pandemic first. “
With the new model “you can try to prevent patient zero from becoming infected, but in doing so, you will catch the virus and become patient zero, or someone else would,” said Tobar. “No matter what you did, important events would just be recalibrated around you “.
“That would mean that – regardless of your actions – the pandemic would occur, giving your younger self the motivation to go back and stop it.” No matter how much you try to create a paradox, events will always adjust, to avoid any inconsistencies. ” .
According to Tobar “the range of mathematical processes that we have discovered shows that time travel as a free will is logically possible in our universe, without any paradox”.
Source: Queensland University