Many physicists believe that time travel is impossible, although not all scientists agree.. One of the reasons for the impossibility of time travel concerns the famous " He suggests that the time traveler, when he returns to the past, may, through his actions, prevent his grandfather from having children.. Simply put, a person can cause the death of his grandfather. This means that the time traveler himself will disappear. The authors of a new study published in the journal Classical and Quantum Gravity believe they have found a solution to this paradox, which means time travel is at least theoretically possible, Live Science writes..

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The current understanding of time is based on Newtonian physics, which assumes a linear progression of events from the past to the future.. At the same time, Einstein's theory of relativity suggests that there are closed timelike curves in the Universe. These are peculiar paths through space-time in the form of loops that close on themselves, which means that with their help you can theoretically travel in time. Such time loops arise due to the strong curvature of space, when a strong curvature of time occurs, according to the theory.

Thus, if a person on a spaceship flies along such a loop, then he can theoretically return back to the starting point not only in space, but also in time. Physicists believe that closed timelike curves can create black holes around themselves.

At the same time, one of the biggest problems with time travel is the paradoxes it creates.. And the “murdered grandfather paradox” is just one of the most famous examples of such paradoxes. Such problems arise because the laws of thermodynamics, which govern heat and energy in the universe, are believed to operate normally in a time loop.

The authors of the study believe that the law of increasing entropy, that is, a thermodynamic quantity that measures the degree of disorder in a system, is the only law of physics that distinguishes between the past and the future. Entropy is the only reason why people remember the past and can predict the future, physicists say.

The authors of the study believe that the laws of thermodynamics change greatly in a closed timelike curve. In such a time loop, quantum fluctuations arise that can erase entropy.

Physicists believe that quantum fluctuations in the time loop with a decrease in entropy can lead to the disappearance of a person’s memories, and aging will be reversed, that is, a time traveler can, on the contrary, become younger. This phenomenon can make even irreversible events, such as the murder of a grandfather, temporary in a time loop. Thus this paradox disappears.

Physicists, using the principle of self-consistency (it states that when returning to the past, the probability of an action occurring that will change existing events is close to zero), suggest that the self-consistency of history naturally follows from the laws of quantum physics.

Based on this research, time travel is theoretically possible, as predicted by Einstein's theory of relativity.. But no one has yet been able to prove that closed timelike curves exist in the Universe. Many physicists do not believe in their existence. More than 30 years ago, physicist Stephen Hawking even proposed a hypothesis about the security of chronology, according to which the laws of physics inherently prevent the creation of time loops.

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