"Okay, okay, a group of us who study physics, discuss biology here, it's a bit weird, right?" Steven Chu interrupted Junxin's discussion with a smile.

"Sorry, sorry, it's kind of addictive!" Junxin smiled awkwardly.

"Junxin, what do you think of the Yangmi equation?" Yang Zhenning suddenly asked. He's a top physicist, yes, the problem is that he's not a top mathematician, but he just put forward a top mathematician, and he can't solve it himself, and at the same time, other mathematicians can't solve it, which has become a regret in his heart, so after meeting Junxin, he couldn't help but ask.

As soon as Professor Yang Zhenning's words came out, the others immediately turned their eyes to Junxin. If we want to say what is the highest achievement of the Chinese in physics, especially theoretical physics, then nine times out of ten it is Yang Chenning's Yang-Mills equation, which has a very high status even in the world physics community. This is also because although Tsung-Dao Lee and Chen-Ning Yang won the Nobel Prize in Physics at the same time, Yang Chen-ning has always been a little higher than Tsung-Dao Lee in terms of status in the physics community.

Regarding this question, when Junxin came to the United States, he already had a premonition that if he met Professor Yang Zhenning one day, he would be asked this question. So be prepared for this question. Hearing this, he smiled and said, "Professor Yang should know that some time ago, I published a series of papers on superstring theory in Physical Review Letters, right?" ”

Not only Yang Zhenning nodded, but the others also nodded involuntarily. They do have a more or less understanding of the superstring theory that has been practiced recently.

"The so-called superstring theory is a new interpretation of the unified field theory formed by the combination of supersymmetry theory and string theory." Junxin explained that there were some things he had to make clear. This is a theory developed by Professor Schwartz of the University of Southern California. Originally, it was a theory used to explain strong interactions, but later because of the introduction of the concept of supersymmetry, it can explain both strong interactions, weak interactions, and electromagnetic interactions. Only when it comes to the problem of gravity is that there is trouble, which is why superstring theory has been tepid in the first few years. ”

"I started in physics in the late '80s and early '81, but because mathematics is relatively good, most of my understanding of physics is based on mathematics. So it's barely half a mathematical physics! The original intention of studying physics was to understand the Yang-Mills equation. ”

"There is no uniform solution to the Yangmi equation. I was thinking about how to build a model or how to use a new mathematical paradigm to explain the Yangmi equation, and by chance, I saw the possibility of combining supersymmetry theory and string theory, and finally came to the correct solution of the gravitational problem in string theory after splitting the Yangmi equation and assuming a part of the contents, thus establishing the first model of superstring theory. ”

"I don't think there is any point in solving this problem in the short term, because it is almost impossible to succeed. I've been working on it for more than a year, but I don't think it's possible to come up with an exact solution in the short term, at least until there is a big development in physics, or a new paradigm in mathematics! ”

Yang Zhenning shook his head, although this answer is new, but there is still no fixed answer, this is not the result he wants.

"Forget it, there is already a quantum gauge field, so leave this question for later!"

"I'm still interested in your superstring theory, can you tell us about your idea?" Wu Chien-shiung asked out loud at the right time. "From an experimental point of view, it's probably impossible for superstring theory to prove it, right?"

"You're talking about the unfalsifiability of string theory!" Jun believes clearly, "There is indeed a problem in string theory, in fact, it is not impossible to prove, but there are two problems that must be solved." One is to raise the energy to the level of being able to observe Planck, and the other is to process the results of string theory. ”

"Because of the peculiarities of string theory, almost any kind of experiment produced in the laboratory can be found in the assumptions of string theory, and you can almost never say that it is wrong!" So, the only way to do that is to raise your energy to the Planck level. Probably before the human race entered the third-level cosmic civilization, this was something to think about. Therefore, I have further studied the matter of proving the superstring theory, but in the end I am not very interested in it. I don't want to dwell too much on this issue, although I've thought too much about it, but that's about it. ”

Speaking of this, Jun Xin smiled slightly bitterly. Superstring theory is indeed a physical theory that is closest to the grand unification theory in Junxin's previous life. However, after the second revolution in superstring theory, its development has entered a bottleneck, and there has been no major breakthrough for decades, and it seems to have been accumulating until the outbreak of the third superstring theory revolution, but unfortunately, Junxin does not see the hope of the third superstring theory revolution.

"Oh? Why is this idea possible, is it the reason why all five hypothetical models of string theory are correct? "For the study of superstring theory, except for Junxin, there is no one sitting more clearly than Yang Zhenning.

"That's not it, in fact, I have discussed this problem with Professor Witten, in fact, I already have a relatively mature solution, and I have roughly estimated it, and there is no problem at all in mathematical calculations." Junxin said with a smile.

"Tell me about it!" For Junxin, although everyone sitting there is older than him, no one dares to underestimate him. Dare to underestimate this perhaps the youngest Ph.D. graduate in the history of Princeton University.

Junxin smiled and said: "The solution to the problem is very simple, if I take the five superstring theoretical models as the five values of a unified model in different limit cases, then wouldn't the problem be completely solved?" ”

"You mean the bigger one of the superstrings?" Ding Zhaozhong frowned and asked, but will it be true?

"That's what I'm good at!" Junxin said with a smile, "After solving the graviton problem, superstring theory mathematically processes five models under the gauge field of the Yangmi equation and turns the problem of physics into a mathematical problem, although it is a challenge for me, but it is also a good research topic." ”

"If Einstein's theory of relativity, Planck's quantum mechanics plus Newton's gravitational force, and the successive emergence of strong and weak interactions, the four forces can be explained in a unified way by the grand unified theory, then why don't I simply learn from Einstein and mathematically integrate the five superstring theoretical models into a standardized grand unified string theory?"

"You succeeded?"

"Come on!"