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In fiction, time travel is typically achieved through the use of a device known as a time machine. The idea of a time machine was popularized by H. G. Wells's 1895 novel The Time Machine. [1] It is uncertain whether time travel to the past would be physically possible. Such travel, if at all feasible, may give rise to questions of causality.
The theoretical study of time travel generally follows the laws of general relativity. Quantum mechanics requires physicists to solve equations describing how probabilities behave along closed timelike curves (CTCs), which are theoretical loops in spacetime that might make it possible to travel through time. [1] [2] [3] [4]
Although traveling back in time is almost-universally considered physically impossible, theoretical research has explored whether it might be possible. [8] It has also been speculated by scientists such as J. Richard Gott, Ronald Mallet [9] and others [10] [11] that humans may someday be able to time travel to the past. [12]
Theoretically, scientists say time travel is possible. The challenging part is recreating time travel in real life.
A scientist has mathematically proven the physical feasibility of paradox-free time travel. But once you go back, you might not like what you find. ... A Scientist Proved Paradox-Free Time Travel ...
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In other words, any travel that is faster-than-light will be seen as traveling backwards in time in some other, equally valid, frames of reference, [39] or need to assume the speculative hypothesis of possible Lorentz violations at a presently unobserved scale (for instance the Planck scale).
A possible type of effect that would accomplish this is a buildup of vacuum fluctuations on the border of the region of spacetime where time travel would first become possible, causing the energy density to become high enough to destroy the system that would otherwise become a time machine.