"Yes, I don't have any objection to the Higgs mechanism of the mass generation mechanism, on the contrary, I think that in quantum chromodynamics, the QCD mass generation mechanism plays a very important role, and it is also a very correct theory, and the predicted elementary particles have also been realized one by one in the high-energy accelerator."

"However, while the mass-generation mechanism has a large role to play in solving strong interactions, this is not enough to change the fact that it is only effective in the field of strong interactions. So in another theory of strong interactions, string theory, came into my eyes. ”

"What do you think of superstrings?" Witten asked.

"This is the most likely model for unifying relativity and quantum mechanics." Jun Xin said succinctly.

"Do you have any ideas?" Witten asked eagerly, he seemed to have found a trace of inspiration in Junxin's words, but the inspiration flashed, and he didn't catch it, so he hoped that Junxin would say more so that he could remember that inspiration.

"Okay, Professor!" Junxin nodded and said. At this point, he didn't notice that he had become a focal point of the discussion. Witten is known to professors and students here, once an undergraduate student studying history, later transferred to physics, and even taught and did research at Harvard University. I just came to Princeton University last year to teach physics department, but because I often participate in afternoon tea discussions in the mathematics department, my reputation in the mathematics department may be greater than that of physics.

It is precisely because of the familiarity with Witten that I know that the purpose of studying mathematics at Witten is to study physics, but most of the mathematics students at Princeton University are engaged in the study of pure mathematics, and almost none of them are in the direction of mathematical physics. Now there were people talking to Professor Witten, and Professor Witten seemed to be excited, and they couldn't help but think about what the two of them were talking about. So they gathered around Junxin.

"String theory, or now superstring theory, the most urgent thing to do now is how to introduce supersymmetry, that is, to introduce fermions, to expand the boson-fermion supersymmetric string theory into boson-fermion supersymmetric string theory, I just have some very superficial ideas about this, you know, in the end, I have only been in contact with physics for less than a year, and there are many things that are still in ignorance."

"That's a shame!" Witten said with a regretful sigh.

"But I think it's still necessary to talk about this kind of superficial idea, after all, this is also the direction of my recent research!" Junxin said after thinking about it.

"Say it!" Witten had a good impression of Junxin at this time, so he naturally attached more importance to his ideas, although Junxin said that it only took him a year to learn physics. But it only took me two or three years to learn physics to get to where we are today, and time is nothing to them.

"Although Professor Schwartz and Raymond and others introduced the concept of supersymmetry in 1971, I read their theory, and I have to say that this is a very subtle concept, the introduction of supergravity theory has eliminated the problem of tachyons, although the so-called gravitons cannot be found when solving the gravitational problem of the old Bose string theory, but the conformity theory itself shows that perhaps superstrings are gravitons." Junxin began to sort out his thoughts and said.

"But I have to say that the Bose string theory, which is sublimated into superstring theory, has some abnormal problems, which leads to the unsustainable superstring theory, because of the problem of supersymmetry, so superstring theory also has almost infinite supersymmetry options, which makes it difficult for us to describe accurately, because often these theories or selectivity itself contradict itself, so, what to do next?"

"While I was thinking about this question, my classmate Wei Donglai from the Department of Mathematics of Mizuki University gave me a very enlightening hint, he was the same as me at Mizuki University, although he was only a freshman in the Department of Mathematics and is now a sophomore, but he was studying the problem of kinks, trying to find a kink invariant, which gave me the inspiration whether there is something constant in these contradictory anomalous theories, just like the invariants of kinks. So I'm looking for something like that, because I think that only by finding invariants can we find a corresponding theory, and maybe this method can eliminate the anomalies in superstring theory. Junxin finally concluded.

"So do you have any conclusions?" Seeing that Junxin was finally about to say the main point, Witten couldn't help but ask.

"When I was studying the Yang-Mills equation, which is why I studied physics, I found that if you use the supersymmetric model of N=1, there is such an interesting fact, this model has two models, open and closed strings, the open string zero membrane describes the Young-Mills equation, and the closed string zero membrane describes the supergravitational theory, which I think is a very interesting breakthrough." Junxin finally finished his words.

However, Witten fell into thinking, and did not speak, Junxin's model touched him greatly, he has been studying physics these days, in fact, whether it is quantum mechanics or relativity, it has natural defects, otherwise Einstein would not have conservatively rejected quantum mechanics in order to maintain the theory of relativity in his later years, although Einstein's achievements in quantum mechanics are not comparable to him. But it is enough to show that both theories are flawed and need to be unified.

After Einstein, the Higgs mechanism of quantum chromodynamics, the gauge field of the Yang-Mills equation, and the gravitational field equation left by Einstein himself vaguely controlled the architectural model of physics. However, the superstring that Junxin said broke the status quo of the separation of the three and unified the three in a model, which was his lifelong pursuit, and now it was about to be realized in front of his eyes.

"Be my graduate student, I can give you the best research conditions and guidance directly." After being silent for a long time, Witten suddenly said. Immediately, there was an uproar around.

"Huh?" Junxin was a little dumbfounded. Although Junxin was a student of Witten in his previous life, Junxin had completed a doctorate in physics from Princeton University at that time. It wasn't until he entered the Institute for Advanced Studies as a postdoctoral researcher that he officially became a disciple of Witten. Today, on the contrary, he was valued by Witten all of a sudden, and wanted to accept him as a student, which made Junxin's brain crash all of a sudden.

"Professor, you..."

"I said, be my graduate student, it doesn't matter if you have a master's degree or a doctorate, as long as you want to, I dare to give it." Witten said with a serious expression.