Bringing the Supermarket to the Apocalypse Chapter 494: Time paradox

The time paradox usually refers to the logic that can lead to contradictory conclusions caused by time travel or time and space. It is also a common feature of all paradox problems that two or more premises cannot be established at the same time.

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

In terms of serious physics theory, there is indeed the possibility of changing time without violating known laws of physics. But more is just a scientific fantasy. In order to solve the "time paradox", there are also many assumptions, such as the relatively prevalent "parallel universe" hypothesis, that our world has many similar "cloned worlds" in the universe. When someone returns to the past, he He entered another parallel world (that is, a world that has changed in the future because of his actions) [2] may also create many other sub-worlds in the main world, and the sub-world is due to a certain moment (may be you return In the past, it collapsed and disappeared, or it may remain the same as before, but the laws and conditions of each world may not be the same.

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

Time is a developing line, and everything you do has a causal relationship. According to Example 1, when you first want to cross back to kill your grandfather, it is reasonable to be here. After you successfully kill your grandfather, at the moment of your grandfather ’s death, anything related to your grandfather will change, and the people your grandfather knows, and the friends or relatives of those you know will not exist , Then according to the butterfly effect, this world will also disappear because you killed your grandfather.

Someone reaches the future and learns that unfortunate outcome a will occur. He went back to reality and took actions to avoid results, and results b. Then the result a does not happen in the future at all, and he cannot know the result a.

a goes back to the past and tries to avoid the car accident of b, but the advice of a is that b insists on driving, and then the car accident occurs. This paradox is similar to self-fulfilling prophecy.

a drank a cup of toxic coffee, and as time passed, the poison in the coffee played a role. He sent a message to the past self to tell the past self not to drink that cup of coffee, the past you did not drink That cup of coffee, then the question is coming, since you did n’t drink that cup of coffee, how could you send that message

After the birth of the paradox of time, 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 is taking a rocket to do interstellar travel, and after a long time returns to the earth. Einstein asserted from the theory of relativity that the two experienced different times and that b will be younger than a when they meet again. Many people have doubts that a sees that b is in motion and b sees that a is also in motion. Why can't it be that a is younger than b. Since the earth can be approximated as an inertial frame, b has to undergo acceleration and deceleration processes and is a reference frame for variable acceleration movement. It is really complicated to discuss, so this problem that Einstein has already discussed has been mistaken by many people for the theory of relativity as a contradictory theory. It is much simpler to discuss this problem with the concepts of space-time graphs and worldlines, but it requires many mathematical knowledge and formulas. here only uses language to describe a simplest situation. However, it is impossible to explain the details in more detail in words. If you are interested, please refer to some relativity books. Our conclusion is that no matter in which reference frame, b is younger than a.

To simplify the problem, only discuss this situation. After a short period of time, the rocket accelerates to sub-light speed. After flying for a period of time, it will turn around in a very short time, and then fly for a period of time, and will meet the earth in a very short time. The purpose of this treatment is to omit the effects of acceleration and deceleration. It is well discussed in the Earth Reference System that the rocket is always a moving clock, and b is younger than a at the reunion. In the rocket reference frame, the earth is moving clock at a constant speed, the time course is slower than in the rocket, but the most critical place is the process of the rocket turning around. During the U-turn, the earth crossed a half circle from a place far behind the rocket in a very short time, and reached a place far away in front of the rocket. This is a "super speed of light" process. It's just that this kind of superluminal speed doesn't contradict the theory of relativity. This kind of "superluminal speed" can't convey any information. It's not really superluminal speed. Without this U-turn process, the rocket and the Earth cannot meet. Since different reference systems do not have a unified time, they cannot relatively their age. Only when they meet can they be relatively. After the rocket turned around, b could not directly receive the information of a, because the information transmission took time. The actual process that b saw was that during the U-turn, the earth ’s time progressed rapidly. From the perspective of b, a reality is younger than b, and then quickly ages when turning around, and when returning home, a is slower than his own. At the reunion, he was still younger than a. In other words, there is no logical contradiction in the theory of relativity.

If time travel is possible, why is there not yet time travellers from the future world around us? The subtext of this question is: Time travellers have not come around us. The most likely reason is that time travel has not been realized in the whole time stream-that is, forever.

apocalypse scientists have not regarded such a problem as a serious theoretical criticism of the time machine. However, his question still caused some physicists to think, and they found a possible answer: that is, the theoretical model that we currently know is possible to achieve time travel, there is a possibility that is universal The common feature is that time travellers are not allowed to return to the time before the time machine existed.

Now Lin Feng has killed Xiaobai from the past, that is to say, there was a phenomenon of space distortion a long time ago, and the former Niya believers used the space distortion to travel through the time to catch people.

Although the time paradox Lin Feng has been seen in the scientific magazine in his supermarket, it is still unthinkable. Perhaps this is a bottleneck point of time energy. When Lin Feng communicates the sequence and correctness of time crossing, his time ability There will be a great improvement.

On the way back, Lin Feng regrets one thing. If Xiaobai is not killed, can he get the ability to pass through space from him?

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