"Model?" Dr. Lu's expression was full of confusion, and Yu Shan felt that the way this theoretical physics master looked at him was as if he was looking at an idiot. ~with~dream~small~say~щ~suimеng~lā

He coughed and said, "Yes, I want to make a theoretical model for this situation, so it's easier to conceive." I thought about some possibilities before, such as the end of the world line......"

"Wait a minute, what do you mean by the end of the world line?" Dr. Lu's strength to call for action has come up.

Yu Shan knows that most scholars like Dr. Lu have this problem, and he likes to call it true, especially in his professional field. If you don't say that you're ugly, Dr. Lu can spray you with unleaded gasoline. What's even more terrifying is that sometimes even if you can justify yourself, he can't find a reason to refute it, and he can shoot a copy of "A Brief History of Time" directly in your face.

Yu Shan said about the rules of the world line restraint, the more he said that Dr. Lu's face became darker, and after listening to Yu Shan's words patiently, Dr. Lu simply asked, "What kind of world line is this I have heard of for the first time, you invented it yourself?" ”

"No, it's a Japanese anime."

"Hah! Can you also take out cartoon stuff and talk about it? ”

Well, Dr. Lu has completely taken Yu Shan for an idiot. He pursed his lips disdainfully, saying, "This kind of baseless theory cannot be called a theory at all." Your theoretical level is somewhat ...... It's worrying, so let's go back and I'll make a list of books for you, you can take a good look at it, and let's talk about this issue later. ”

Yu Shan asked, "This model is completely impossible?" ”

Dr. Lu said, "In terms of probability, there may be such a possibility, but a closer analysis shows that it is not possible at all. The world line you just mentioned is constrained, there is too much subjective consciousness, and science is a method of objectively studying the world, so fundamentally speaking, your theory is not scientific. ”

Yu Shan was embarrassed, but also a little happy. It was embarrassing to be sprayed by Lao Lu, and happy that the rules of that door were not closed by the world line. As long as it's not a world line, maybe under some other unknown rules, he can return to the original timeline. There are people he dreams of, there is an environment he is familiar with, and there is a comfort that is completely different from the present.

After spraying Yu Shan, Dr. Lu took out a pen and paper from his bag, and said while writing and drawing, "You are planning to write, so let's not consider the operating principle of the door first, but consider its operating rules first." To understand the rules, we must first understand what time and space are...... Do you know what time is? ”

Yu Shan still knows this, and he blurted out, "Time is a variable that describes the change of things." ”

Unexpectedly, Dr. Lu said, "To be honest, I haven't figured out what time is. So far, the self-consistent quantum space-time theory has not yet been born, and the superstring theory and theory can only be realized in one-dimensional time, nine-dimensional space, or one-dimensional time and ten-dimensional space, which involves the question of how to return to one-dimensional time and three-dimensional space...... Well, you're writing anyway, and I'll try to tell you as simple as possible. ”

As he spoke, Dr. Lu had already drawn on the paper.

"I won't tell you about one-dimensional and two-dimensional, I'll start with three-dimensional. It's a piece of paper. "He drew a parallelogram and marked two points A and B at the two corners, followed by a rolled paper tube and marked the two points A and B that almost coincided." You see, ants are two-dimensional creatures, and if they go from A to B, they have to go as far as one side on this piece of paper, right? ”

"Yes."

"Okay, now we're curling the paper, this ant only needs to walk through the seam to get to point B, in the ant's opinion, is this a wormhole?"

"That's right."

"Very well, bending a two-dimensional paper to get a three-dimensional cylinder, does this mean that bending the two-dimensional space will give you a three-dimensional space? Keep this in mind, otherwise what you're going to say next won't be easy to understand. ”

"Four dimensions are one more dimension than three dimensions—time." Dr. Lu drew two people, connected by a line in the middle, "This is you a minute ago, this is you a minute later, and these two you are seen as two dots, and when they are connected, they are lines in four-dimensional space." You can't see the past you, and you can't see the future you, just like the ants I just said. The ant is a two-dimensional creature, so what it sees in three-dimensional space is always a cross-section. You are the same, you are a three-dimensional creature, and what you see in the four-dimensional space is always a cross-section, and what you see is you, me and him now, that is, at this moment. Do you understand? ”

Yu Shan nodded.

"Then let's move on. As three-dimensional beings, we are not aware of what happens in the fourth dimension. When we say that time goes by, it's really moving along the timeline. This line is the line in the four-dimensional space I just mentioned. In other words, we are moving forward along the line of the fourth dimension. If we were four-dimensional beings, we would see our past and future, but there was only one timeline. But what if not one timeline? ”

Yu Shan felt that he was starting to burn his brain a little.

Dr. Lu said, "To give you a simple example, when you graduated from university, you chose to start a business, so you have what you have now. And if you had chosen to take the civil service exam, you would probably be a bureaucrat now. These are two timelines that intersect and give rise to a new dimension, which is the fifth dimension. In the five-dimensional space, you can see yourself as an entrepreneur, you can also see yourself as a bureaucrat, and in general, you can see different branches of your future. Remember what I just said about ants? Now it's you. Now you are going to visit the past you, what should we do? It's easy to understand that bend a timeline of four-dimensional space so that you can jump back in time and meet your previous you. In other words, in five-dimensional space, you can travel through a timeline of the past. ”

Yu Shan thought about it carefully, nodded towards Dr. Lu, and said, "I can understand, you go on." ”

"Okay, I'm talking about six-dimensional space now. Let's take you as an example, now you feel that starting a business is very difficult, and you want to live a comfortable bureaucratic life. In the five-dimensional space, you can go back to the time when you graduated from college and tell you at that time, don't start a business, go to the civil service exam. But it's very risky, and you're likely to have countless branches, and you won't necessarily be a bureaucrat in the future. Think about the ants before, we directly bend the five-dimensional space to produce the six-dimensional space, so that you who are the entrepreneur can directly travel to the timeline of you as a bureaucrat. ”

Dr. Lu scratched his head with a pen, frowned, and said, "It seems a bit too much......" He looked up at Yu Shan and asked, "You can understand it by now, right?" ”

"It's okay, it's all understood."

"Oh, that's fine. Now let's talk about how your door works, and if you think about what I just said, think about whether there is anything similar? ”

In fact, without Dr. Lu asking, Yu Shan has already discovered the similarities. Calibrating the ninety-eight years as a point, Yu Shan's every round trip will produce a new timeline, which is almost the same as the five-dimensional space model mentioned by Dr. Lu!

The timeline transition model that Yu Shan had thought of before could be embedded in the five-dimensional space model. The difference is that Yu Shan has always thought and worried that once the timeline jumps, the former timeline will disappear without a trace. And according to the five-dimensional space model, the former timeline has not disappeared at all, and Yu Shan just can't find a way to go back!

And that door is not a simple door of time, but a door of time and space that allows three-dimensional creatures to enter the five-dimensional space. Since its principle is a five-dimensional space, theoretically speaking, it will definitely allow Yu Shan to return to the original timeline.

This discovery made Yu Shan very excited, although he didn't know the method at all now, but at least he knew the possibility of going back.

"That door can make ...... People enter the five-dimensional space? ”

Dr. Lu looked at Yu Shan with a teachable expression, and said, "Yes, although there is a slight difference, it is almost the same meaning." But you're not sure if there's a five-dimensional space around us. However, Professor Randall is a strong supporter of the idea that five-dimensional space exists all around us, and she once did an experiment in which some particles disappeared. She thinks the particles are entering a higher dimension. But most scientists believe that after the Big Bang, the other six dimensions have curled up, and that the six-dimensional space will only unfold when our current four-dimensional space collapses. ”

At this time, Lu Jing came over with her mobile phone, and said while sitting down, "You two are talking quite speculatively?" ”

Yu Shan said very seriously: "I asked Lao Lu for some theoretical physics knowledge, and I benefited a lot. ”

Dr. Lu shook his head casually, "I can't talk about it, it's just some basic common sense." ”

Well, this guy is talking to death again.

Lu Jing burst out laughing, and it took a long time before she said, "Second brother, what are your plans to come back this time?" Do you still want to go back to the UK? ”

Dr. Lu shook his head and said, "I have interviewed several times at several universities in the UK, and the results have not been satisfactory. This time, I plan to find a job at a university and continue my research in theoretical physics. ”

Theoretical physics is a discipline that is different from other disciplines, and it is difficult to produce results. If you study a microscopic particle or something, you can produce a paper by doing an experiment, but a theory is like a philosophy, and you can't guarantee that you will be able to produce results. If you're lucky, you're the next Einstein, Hawking, and if you're unlucky, it's useless.

In addition, with the continuous development of the domestic economy and the increasing investment in teaching and scientific research, sea turtles are not as popular as they were more than ten years ago. It's hard to say whether Dr. Lu will be able to find a good job when he comes back this time.

After Dr. Lu finished speaking, Lu Jing glanced at Yu Shan quite meaningfully, and Yu Shan immediately understood, so he said, "Old Lu, you have a general goal in mind, right?" You can go and see it first, if you don't like it, I will help you contact Shenzhen-Hong Kong University, I am very familiar with several deans of Shenzhen-Hong Kong University, and I can help you introduce you. ”

Dr. Lu pursed his lips and said, 'Say more', obviously a little disdainful of Shenzhen-Hong Kong University. It is estimated that this proud son of heaven is holding back his strength to work hard in first-class and second-class colleges.

Yu Shan didn't care, he had gained a lot from Dr. Lu today, and it could be said that he saw another possibility.

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