MTL - Bringing the Supermarket to the Apocalypse-Chapter 494 Time paradox
Time paradox usually refers to the logical conclusion that contradictory conclusions can be derived from time travel or shuttle time and space. It is a common feature of all paradoxes to assume that two or more premise cannot be established at the same time.
Time paradox was first mentioned in science fiction. The necessary premise of this paradox is that humans can control the "fourth dimension" after the three-dimensional space - time, as desired, and can travel to the past or the future.
As far as serious physics theory is concerned, there is indeed the possibility of changing time without violating known physical laws. But more is just a scientific fantasy. In order to solve the "time paradox", there are also various hypotheses, such as the more prevalent "parallel universe" hypothesis, that our world has many similar "cloning worlds" in the universe. When someone returns to the past, he Entering another parallel world (that is, the world in which the future has changed because of his actions) [2] may also have created many other sub-worlds in the main world, while the vice world is at some point (maybe you are back yourself) The past moments have collapsed and disappeared, and it may be the same as the original, but the laws and conditions of each world may not be the same.
a back to the past, killing a grandfather before a father's birth. Since a grandfather of a is dead, there will be no father of a; a father without a will not have a. Since a does not exist, it is impossible to go back to the past and kill a grandfather.
Time is a developing line, and there is a causal relationship between everything you do. According to Example 1, when you first want to cross back and kill your grandfather, it is reasonable to be here. After you successfully kill your grandfather, at the moment your grandfather dies, anything related to your grandfather will change. The people your grandfather knows, and the friends or relatives of people you know with your grandfather will not exist. Then, according to the butterfly effect, the world will disappear because you killed your grandfather.
Someone arrives in the future and learns that an unfortunate result will occur. He returned to reality to make an action that avoids the result, and the result b. Then the result a does not happen at all in the future, and it is impossible for him to know the result a.
a Back to the past, try to avoid the car accident of b, who knows that it is a advice to make b insist on driving, and then a car accident. This paradox is similar to the self-fulfilling prophecy.
a drank a cup of toxic coffee, and over time, the poison in the coffee played a role. He sent a message to the past himself telling the past that he should not drink the cup of coffee. You didn’t drink the cup of coffee in the past. Then the question is coming. If you didn't drink the cup of coffee, how can you send that message?
After the birth of the time paradox, there was once a very interesting problem - twins. A pair of twins a and b, a on the earth, b by rocket to do interstellar travel, after a long time to return to Earth. Einstein asserted by the theory of relativity that the two experienced different times, and b would be younger than a at the reunion. Many people have doubts that a see b is in motion, b see a is also moving, why can't a be younger than b? Because the earth can be approximated as the inertial system, b has to undergo the acceleration and deceleration process, which is the variable acceleration reference frame. The real discussion is very complicated, so this Einstein has already discussed the problem clearly because many people mistake the theory of relativity as a contradiction. It would be much easier to discuss this problem with the concept of space-time maps and world lines, but with a lot of mathematical knowledge and formulas. This is just a language to describe one of the simplest situations. However, only the language can not explain the details in more detail. If you are interested, please refer to some books on relativity. Our conclusion is that b is younger than a in any reference frame.
In order to simplify the problem, only this situation is discussed. The rocket accelerates to the sub-light speed in a very short time. After a period of flight, it turns around in a very short time, flies for a while, and decels with 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. The Rockets are always moving clocks. When they meet again, b is younger than a. In the rocket reference system, the earth is a moving clock during the constant speed process, and the time course is slower than the rocket, but the most critical part is the process of the rocket turning around. In the U-turn process, the Earth traveled far from the rear of the rocket through a half-circle in a very short time, reaching far away in front of the rocket. This is a "superluminal speed" process. It is only this kind of superluminal speed that is not contradictory to relativity. This "superluminal speed" does not convey any information, not the superluminal speed in the true sense. Without this U-turn process, the rocket and the Earth cannot meet. Because there is no uniform time for different reference systems, it is impossible to compare their ages and only compare them when they meet. After the rocket turns around, b can't directly accept the information of a, because the information transfer takes time. The actual process seen by b is that the time of the earth has suddenly increased during the U-turn process. In the view of b, a reality is younger than b, and then quickly aging when turning around. When returning, a is slower than aging. When I meet again, I am still younger than a. In other words, there is no logical contradiction in relativity.
If time travel is possible, why are we still not surrounded by time travellers from the future world? The subtext of this question is: Time travelers have not come to us, the most likely reason is that time travel has not been realized in the long time - that is, forever.
The scientists of the last days did not regard such problems as a serious theoretical martyrdom of the time machine. However, his question has caused some physicists to think, and they have found a possible answer: that is, what we know so far is possible to realize the theoretical model of time travel, and one is likely to have universality. The common feature is that it does not allow time travelers to return to the era before the time machine existed.
Now Lin Feng has killed the white from the past, which means that there has been a distortion of the space a long time ago, and the former Naiya believers used the space distortion to cross the present time to catch people.
Although the time public opinion Lin Feng has already seen it in the science magazine in his supermarket, but still can't figure it out now, maybe this is a bottleneck point of time energy. When Lin Feng communicates with the time and correctness of time, his time ability There will be a big improvement.
On the way back, Lin Feng regretted one thing. If he didn't kill Xiaobai, could he get the ability to cross the space from him?
...
