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.”
In 2020, a University of Queensland student and physics professor discovered that time travel with free will is mathematically possible without paradox. The research was published in a peer-reviewed paper in Classical and Quantum Gravity.
The physicists say that time is self-healing, and changes in the past wouldn’t necessarily cause a universe-ending paradox. However, the research also states that time travel can only be consistent and free of logical paradoxes if the outputs of all but two space-time regions are fixed.
Some say that the paper’s headline is misleading because it assumes time travel is possible, rather than proving it.
According to some, time travel is theoretically possible, but not in the way you might expect.
According to NASA, time travel is possible through “time dilation”. Albert Einstein’s theory of relativity says that time and motion are relative to each other, and nothing can go faster than the speed of light.
According to Wikipedia, time travel to the past is theoretically possible in certain general relativity spacetime geometries. These include cosmic strings, traversable wormholes, and Alcubierre drives.
According to the BBC, traveling into the future is achievable, but traveling into the past is either wildly difficult or absolutely impossible.
According to Stephen Hawking, backward time travel is not supported by his theories. This is because new matter would need to be created.
According to Space.com, no person has ever demonstrated the kind of back-and-forth time travel seen in science fiction.
In 2020, University of Queensland student Germain Tobar and physics professor Fabio Costa published a paper in Classical and Quantum Gravity that mathematically proves time travel with free will is possible without paradox.
The paper’s mathematical model explains that time travelers can act freely without creating paradoxes. The research argues that no matter what action a time traveler takes, events will eventually fall into place.
Costa, who supervised the research, said, “The maths checks out – and the results are the stuff of science fiction”.
Time travel is a hypothetical activity of traveling into the past or future. It’s a widely recognized concept in fiction, particularly science fiction. In fiction, time travel is typically achieved through the use of a hypothetical device known as a time machine
Some scientists believe that time travel is theoretically possible. However, time travel is still considered impossible because theories can’t be tested practically.
According to NASA, time travel is possible through “time dilation”. Albert Einstein’s theory of relativity states that time and motion are relative to each other, and nothing can go faster than the speed of light. However, many in the scientific community believe that backward time travel is highly unlikely.
According to Stephen Hawking, backward time travel is not supported by his theories. Hawking’s theories state that new matter would need to be created in order to travel back in time.
Time travel also violates the second law of thermodynamics, which states that entropy or randomness must always increase. Time can only move in one direction.
The grandfather paradox is a type of temporal paradox that involves time travel. It was first described by science fiction writer Nathaniel Schachner in his short story Ancestral Voices, and by René Barjavel in his 1943 book Le Voyageur Imprudent (Future Times Three).
The grandfather paradox is a conundrum that involves traveling back in time to kill your grandfather before he has children. Some say that the grandfather paradox can be resolved if the time traveler begins on a timeline where the grandfather survives long enough to have offspring. After traveling back and killing the grandfather, the time traveler will continue along a parallel timeline where they will never be born.
Germain Tobar, a physics student at the University of Queensland, worked out how to make time travel viable without paradoxes. Tobar’s work suggests that the disease would still escape some other way, removing the paradox. Whatever the time traveler did, the disease wouldn’t be stopped.
According to some physicists, time travel can be consistent and free of logical paradoxes. However, this requires the outputs of all but two space-time regions to be fixed.
Tobar and Costa’s model shows that if only one universe exists, it is possible to allow for paradox-free time travel. This work also has other implications, including the unification of quantum theory with general relativity.
However, some theoretical physicists argue that time travel cannot be possible because if it was, we would already be doing it. They also argue that it is forbidden by the laws of physics, like the second law of thermodynamics or relativity.
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