Time Travel: Travel to the Past

Time Travel: Travel to the Past

Stephen Hawking believed that this journey was impossible because of the paradoxes that arise. One of the paradoxes is that the time traveler goes back in time to his past and kills his grandfather before he has children (the grandfather paradox). What will happen next? The answers are different. One of the answers is that the nephew also disappears. Another answer is that nothing will happen because his grandfather was completely different from what the time traveler knew. Another answer says that the grandson will go to the parallel universe and after he kills his grandfather, the grandson will disappear from the parallel universe.

If time travel was invented somewhere in the future of mankind, why do we not notice traces of these inventions? Why isn't the passenger trying to save the Titanic from sinking? Similarly, there are several answers. It is possible that the passenger tried to warn the captain of the Titanic but was ignored (Novikov's sequencing principle). Or maybe a passenger in the past was the cause of the sinking of the Titanic. Or, as in the answer above, the time traveler returned to the Titanic in a parallel universe, not our universe. Another answer (to the question why we don't see the effects of time travel if it was invented somewhere in the future) is that travel to the past is only possible from the future back to the time when the time travel device was invented. And here would be the possibility that the Earth would be destroyed in a major cataclysm or nuclear war, and time travel would not be automatically invented.

Tipler Cylinder

The Tipler Cylinder, also called the Tipler Time Machine, is a hypothetical object that allows you to travel to the past (theoretically). This approach is designed to work based on our current knowledge of physics, especially general relativity. But more recent results have shown that the Tipler cylinder can only travel in time if its length is infinite. Tipler's cylinder was discovered as a solution to the GR equations by Willem Jacob van Stockum in 1936 and Corneille Lanczos in 1924 but was not recognized as a closed time curve since Frank Tipler's analysis in 1974, published in the book "Rotating Cylinders and the Possibility violations of global causality".

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