It turns out that time travel to the past is actually relatively easy. All you need to do is rotate the universe.
The famous mathematician Kurt Gödel was a friend and neighbor of Albert Einstein at Princeton University. He became very interested in Einstein’s general theory of relativity, which linked the existence of matter and energy to the distortions and distortions of space and time, and the distortions and distortions to the behavior of matter and energy. connect to
Gödel was interested in whether the theory of relativity would allow time travel to the past. Einstein’s theory is claimed to be the ultimate framework for the nature of space and time, and as far as we know, time travel to the past is forbidden. Gödel therefore thought that general relativity should automatically forbid it.
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And Gödel found that in fact general relativity had no problem with time travel to the past. The trick is to move the universe.
Gödel built a relatively simple, artificial model universe to prove his point. This universe is spinning and has only one component. Its component is the negative cosmological constant that resists the centrifugal force of rotation to keep the universe static.
Gödel discovered that following certain paths in this spinning universe could lead you to your own past. You’d have to travel incredibly far and billions of light-years to do that, but it’s possible. When you travel, you get caught up in the rotation of the universe. It is not only the rotation of matter in the universe, but the rotation of space and time itself. increase.
You will embark on a journey, never move faster than the speed of light, and even when you return to your starting point, you will find yourself in your past.
The possibility of reverse time travel creates paradoxes and violates our understanding of causality. Thankfully, all observations show that the universe is not rotating, thus shielding us from Gödel’s problem with retrograde time. But why general relativity has no problem with this seemingly impossible phenomenon remains a mystery to this day. Gödel used the example of a spinning universe to argue that general relativity is incomplete, and he may still be right.