reax; Time paradox usually refers to logically deduced contradictory conclusions caused by time travel or traveling through time and space. At the same time, it assumes two or more premises that cannot be established at the same time, which is a common feature of all paradox problems.

The time paradox was first mentioned in science fiction. The necessary premise of this paradox is that human beings can freely control the "fourth dimension" time after the three-dimensional space, and can travel to the past or the future.

As far as serious physical theories are concerned, it is indeed possible to change time without violating the known laws of physics. But it's more of a science fantasy. In order to solve the "time paradox", there are also various hypotheses, such as the more popular "parallel universe" hypothesis, which believes that our world has many similar "clone worlds" in the universe. Just entered another parallel world 2. It may also be that many other sub-worlds were created in the main world, and the sub-world collapsed and disappeared at a certain moment, or it may remain the same as before, but the laws of each world and the situation may not be the same.

a went back to the past and killed a's grandfather before a's father was born. Since a's grandfather is dead, there can be no father of a; without a father, there can be no a. Since a does not exist, it is impossible to go back in time and kill a's grandfather.

Time is a developing thread, and there is a cause and effect in everything you do. According to example 1, when you first want to travel back in time and kill your grandfather, it is reasonable to come here. After you successfully kill your grandfather, at the moment your grandfather dies, everything related to your grandfather will change, people your grandfather knew, and friends or relatives of people your grandfather knew will no longer exist , then according to the butterfly effect, the world will also disappear because you killed your grandfather.

Someone travels into the future and learns that an unfortunate outcome a will occur. He comes back to reality and takes actions that avoid the outcome, outcome b. Then the result a will not happen in the future at all, so it is impossible for him to know the result a.

A goes back to the past and tries to avoid b's car accident, but it is a's persuasion that makes b insist on driving, and then a car accident occurs. This paradox is similar to a self-fulfilling prophecy.

A drank a cup of coffee that was poisoned, and over time, the poison in the coffee took effect, he sent a message to his past self telling his past self not to drink that cup of coffee, past you did not drink that cup of coffee , so here comes the question, since you didn't drink that cup of coffee, why did you send that message

After the time paradox was born, there was once a very interesting and difficult problem, the twin paradox. A pair of twins a and b, a is on the earth, b takes a rocket to go on an interstellar journey, and returns to the earth after a long time. Einstein asserted from the theory of relativity that the two experienced different times, and b will be younger than a when they meet again. Many people have doubts, thinking that a is moving and b is moving, why can't a be younger than b? Since the earth can be approximated as an inertial system, b has to experience acceleration and deceleration processes, and it is a variable acceleration motion reference system. The real discussion is very complicated. Therefore, this problem that Einstein has discussed clearly has been misunderstood by many people as the theory of relativity is a self-contradictory theory. It would be much easier to discuss this problem with the concept of space-time diagram and world line, but it needs to use a lot of mathematical knowledge and formulas. Here we just use language to describe the simplest situation. However, the details cannot be explained in more detail only with language. If you are interested, please refer to some relativity books. Our conclusion is that b is younger than a in whatever frame of reference.

In order to simplify the problem, we only discuss this situation. The rocket accelerates to the sublight speed in a very short time, and after flying for a period of time, it turns around in a very short time, flies for another period of time, and decelerates in a very short time to meet the earth. The purpose of this processing is to ignore the effects of acceleration and deceleration. It is easy to discuss in the reference system of the earth, the rocket is always a clock, and b is younger than a when they reunite. In the reference system of the rocket, the earth is a clock in the process of constant speed, and the time progress is slower than that in the rocket, but the most critical point is the process of the rocket turning around. During the U-turn process, the earth crosses half a circle in a very short time from a place far behind the rocket, and reaches a place far in front of the rocket. This is a "superluminal" process. It’s just that this super-light speed does not contradict the theory of relativity, and this “super-light speed” cannot transmit any information, and it is not super-light speed in the true sense. Without this U-turn process, the rocket and the earth cannot meet, because different reference systems do not have a unified time, so their ages cannot be compared, only when they meet. After the rocket turns around, b cannot directly receive the information from a, because it takes time to transmit the information. b The actual process is that during the U-turn process, the time progress of the earth is accelerated rapidly. In fact, ba is younger than b, and then ages rapidly when turning around, and when returning, a is aging slower than himself. When they reunited, they were still younger than a. That is to say, there is no logical contradiction in the theory of relativity.

If time travel is possible, why haven't we been surrounded by time travelers from the future world? The subtext of this question is: time travelers have not come around us, the most likely reason is that time travel is in the long river of time. In other words, it has never been realized.

End-time scientists do not take such a question as a serious theoretical challenge to the time machine. However, his question got some physicists thinking, and they found a possible answer: that is, the theoretical model of time travel as we know it is possible, there is a very likely universal The common feature is that time travelers are not allowed to go back to the era before the existence of time machines.

Now that Lin Feng has solved the crisis of the world of death, all that remains is to find another hidden base, that is to say, there was a phenomenon of space distortion a long time ago, and the former Naia believers used space distortion to travel to the present time to destroy.

Although the time paradox Lin Feng has been published in the science magazine in his supermarket, he still can’t figure it out. Maybe this is a bottleneck of time energy. When Lin Feng comprehends the order and correctness of time travel, his time ability will have Great improvement.

When thinking about it again, Lin Feng regretted one thing. If he could get the energy of Kuna Jieer, would he be able to get the ability to travel through space from him? To be continued.

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