Scholar’s Starry Sea

"There are still many important problems in high-energy Physics that have not been solved. There are also some wonderful Mathematics structures in superstring theory. If you are interested in it, you may wish to learn more about differential geometry. And topology."

Talking with the contemporary theory of Physics Master, the topic will inevitably involve the most popular string theory now, and it is most likely to become the string theory of the Physics Grand Unified Theory.

Although Mr. Yang is now 95 years old, he is still very energetic when he talks about the field he is familiar with. The few points he occasionally mentions made Wu Bin very educated.

"You look very interested?" Old Yang looked at Wu Bin slightly smiled, as if he saw the flame of interest in his eyes.

"I'm very interested in unknown things."

When I change to a general teacher, I usually sigh when I meet Wu Bin who does some research on everything. , I think he can't get things done with a hammer.

But Yang Zhenning in front of him is different. He himself is the kind of person who has made great contributions to innovation in many fields. How can he narrowly think that scholar should be exhausted in one specialization field? What about a lifetime?

So Yang Zhenning was very happy to hear Wu Bin’s answer, and continued: "If you think this direction is right, then you may be disappointed in the future because the idea of ​​Superstring is too much in contact with actual Physics. Less."

"It seems more like a Mathematics problem now." Wu Bin thought for a while and said.

"Yes, but in my academic career, I have seen too many theories that have little contact with actual Physics and it is difficult to succeed in the end."

Drink a sip of hot tea Yang Zhenning continued: "However, the digital structure of the superstring is very wonderful. If you can absorb the subtleties in it, it may be helpful for you to develop some kind of real problem-solving ideas in the future. From this standpoint, I suggest You can do superstrings."

Lao Yang said at a moderate pace, but his tone still revealed a little disagreement with the superstring theory.

"I will try." Wu Bin nodded and said seriously.

Yang Zhenning listened to slightly nodded: "The insights that came up from abstract Mathematics, which later can be greatly successful in Physics, are very few examples. I hope you can understand this before you study."

From Yang Lao’s words, Wu Bin read that he was afraid that he would be disappointed if he did nothing after studying the superstring, so he replied it straightforwardly:

"Actually, I personally I am not very entangled in the right or wrong result. What I pursue is just the fun of getting involved."

"Ha...ha...ha."

A burst of rhythmic feeling Laughter, the expression on Yang Zhenning's face revealed a little satisfaction.

After laughing, Yang Zhenning picked up a notebook on the coffee table, then took out the pen in his jacket pocket and wrote on it.

【Mathematics (1)】-【Physics Theoretical Structure (2)】-【The Combination of Theory and Experiment (3)】-【Experiment (4)】

Pushing the notebook in front of Wu Bin, Yang Zhenning continued: "This is the relationship between Mathematics, theoretical Physics, and experiment. Combining 2 and 3 is theoretical Physics. A theoretical pure structure is connected to the experiment through the second part. Yes."

Hearing this, Wu Bin couldn't help but catch the conversation, "But if the pure structure cannot be connected with the experiment for a long time, it will definitely lose its place in Physics..."

Yang Zhenning smiled and nodded after listening: "Yes, the values ​​in Physics must come from experiments in the end. The reason why Superstring is so controversial is because it has not passed the second part. Connected with the experiment."

Looking at Wu Bin looked thoughtful, Yang Zhenning continued: "When I was in the United States, there were students who argued with me. They said that when I did the normative field theory in 1954, I didn’t Is it also a pure structure that has nothing to do with the experiment?"

Changed a posture, Yang Zhenning continued: "Indeed, it did not have much to do with the experiment at that time, but if they had read it carefully My article will find that at that time it has a close relationship with two theoretical structures that have a solid experimental basis. They are..."

"Isospin conservation and Maxwell equation?" Wu Bin couldn't help but Answered a wave.

"Ha...Ha...Ha."

After listening to Wu Bin's "Quick Answer", Yang Zhenning burst into a rhythmic laughter and was very happy Looking at Wu Bin, he said, "I wish you were sitting down when I talked about this topic in class last time."

After being praised, Wu Bin smiled shyly and said: Fortunately to be able to listen to Professor Yang's class once."

"Ah..." Lightly sighed, Yang Zhenning shook his head and said, "A few years ago, I could bring a group of students to class, but now there is no such thing. Physical strength."

After speaking, looking at Wu Bin who was about to speak, Yang Zhenning waved his hand: "Don't say anything about the polite words that I look young. I will understand my own body. But let’s talk about you. I heard that you have learned all the contents of the four major mechanics in college?"

Wu Bin shook his head and replied: "I can only say a rough understanding, no Dare to say that you are finished."

"Very humble." Yang Zhenning took a sip of tea, and then said: "At that time in 1971, I went back to China many times and found out what the so-called Physics department The "Four Mechanics" suppressed the students' breath. Of course, I do not deny the importance of the Four Mechanics. They are the backbone of Physics, but only the backbone of Physics is just a skeleton, and flesh and blood are needed. It is living Physics."

"Then what is the flesh and blood of Physics?" Wu Bin asked curiously.

"New things, living things, things that are closely related to phenomena, the vernacular is to pay more attention to the frontiers of research, and in my eyes, you are now a flesh and blood Physics person."

Faced with this sudden high evaluation, Wu Bin was a little startled.

Without giving Wu Bin a chance to reply, Yang Zhenning continued: "In your paper, I read the innovative spirit of fearing nothing in Heaven or Earth. You dare to make breakthroughs and are willing to make breakthroughs. Making drastic changes based on previous studies. I like this spirit very much."

Wu Bin: "I am very happy to get your affirmation from Professor Yang."

"It's eating."

Hearing the sound from the kitchen, Yang Zhenning said to Wu Bin along the way: "Let’s eat first."

Wu Bin: "Okay."

However, for the two of Tan Xing Zhengnong, sitting at the dinner table is just a change of place for conversation. After three hours have passed, the topics they talked about have changed several times. The rice was barely moved.

It wasn't until Weng Fan put the reheated ribs soup on the table for the third time, Yang Zhenning laughed at Wu Bin and said, "Eat first, and then the taste is really wrong."

"Okay." After listening, Wu Bin immediately moved the chopsticks in his hand and swept it on the table without forgetting to move towards Weng Fan and said a few words here: "Your craftsmanship is so good. ."