What can physicists do to explain the contradiction between the law of cause and effect and time tra

You may have heard about time travel, going back to the past (future), faster-than-light time travel, etc., many times ago, but many people just follow the trend and may not have seriously considered these issues. But for these problems involving the laws of nature and the real world, physicists have been exploring them theoretically.

However, the most serious problem facing physicists is the law of cause and effect, which is the strongest of the laws of nature.

The so-called law of cause and effect means that all existing states in the universe are the result of the accumulation of all the previous states of the universe, and any state of motion is the result of the accumulation of previous states of motion. At the physical level, it is universal. Of course, this is also in line with materialism.

To put it more colloquially: plant melons and get melons, plant beans and get beans!

Under the premise of the law of cause and effect, time travel becomes quite difficult, even incomprehensible! Because whether it is you yourself or an object, as long as you can travel through time and space, then it will inevitably lead to a change in the existing state of the universe, and the law of conservation of energy will become invalid, because the existing time and space, energy will be missing, and the time and space you travel to will increase. This is not allowed on a physical level.

But in order to avoid these situations, physicists have come up with many interesting theories, and here I personally support the multiverse theory (parallel universe).

This theory explains that when you go back in time, if you try to save a friend who is dying, it goes well, you manage to save him, but when you go back to the present, you find that the person is still dead. Because if you go back to the past, it is equivalent to you creating another cosmic space-time, in that space-time, your friend was rescued by you, but in this space-time, although you are very unwilling, but your friend is dead and dead.

You may think that this theory is very capricious, but you must know that the proposition of traveling through time and space is even more capricious! And the theory of parallel universes does not violate the law of cause and effect, so even if this theory is very brain-opening, it is the best explanation from the theoretical level.

Because the theory of quantum mechanics is used to express that time and space travel changes the past or the future, that is, changes the reality of the situation, it contradicts the law of cause and effect.

You've probably heard about time travel, going back in time (future), ultralight time travel, etc., many people just go with the flow and enjoy it, maybe they don't think about it seriously. But for these problems involving the laws of nature and the real world, physicists have been exploring them theoretically.

Physicists have solved the contradiction with the parallel universe hypothesis. The changes made by human beings in the past and the future in time and space travel do not affect the facts that have already happened, but derive their parallel time and this time without interfering with each other.