Miss Lawrence was still very capable of execution, and was back in Witten's office just a dozen minutes later, just after Witten had just finished reading a discussion of the conjecture of supersymmetry and string theory published by the late Professors Scheker and Schwartz in '79.

"Professor, there is indeed an article in this issue of Physical Review Letters about supersymmetrical chord theory, the author is called Junxin, and the corresponding unit is the Department of Physics, Shuimu University, China."

"Oh? He should be a math student, right? How did you become a physics student again? Forget it, Miss Lawrence, put this article here, I guess it will take a long time to calculate. Could you please make me a cup of coffee? ”

"Okay, Professor, wait a minute!"

University of Cambridge, UK.

For the University of Cambridge, there is no such thing as a physics department, but the world-famous Cavendish Laboratory is synonymous with the physics department of the University of Cambridge in the United Kingdom.

"Davis, what do you think of this article?" Hawking, who was in a wheelchair, asked his colleague, the famous theoretical physicist P.C.W. Davis, in his distinctive metallic voice.

"The combination of supergravitational symmetry chord theory is a very interesting idea, and Michael from the physics department at Queen Mary recently pitched it to me when he talked to me." Davis said in a mocking tone, "I don't think the model that solves supersymmetric chord theory is important, what matters is whether the mathematical problem of combining string theory and supergravitational symmetry has a solution, divergence or convergence, although this article solves the problem of divergence, but does not give an exact mathematical solution." ”

"So you're against superstring theory?" Hawking asked.

"No, no, no, I don't object to this theory Stephen, to be honest, I am interested in the theory that can solve the black hole problem of graviton, but although this so-called superstring theory has various flaws, it is still a very interesting model, I think I should really take a good look at and understand the article written by this Chinese." What do you think? Stephen? ”

"I have little interest in superstring theory, although his theory has a perfect mathematical structure, but after mathematical calculations, I found that not only does the mathematical equation for building the model not have an exact solution, but also there are many abnormal problems, such as the Yang-Mills energy field defect standard equation is a big problem, if the author does not solve this problem, then it is impossible to include the theory of relativity in the category of quantum mechanics."

"Stephen, I know that for the theory of relativity, its perfect geometric picture is indeed impeccable, and it can even be said to be flawless, but it is undeniable that the effect of relativity in the macroscopic scene cannot explain the microscopic effect of the subatomic particle world, quantum mechanics and relativity are the natural opposites of the two, and if you want to unify the two, you will either incorporate the results of quantum mechanics in the framework of relativity, or incorporate the results of relativity theory on the basis of quantum mechanics, compared to the former, I'm more sure that the latter is what I'm after. ”

"On the contrary, people's cognition always goes from the macrocosm and then gradually goes deeper into the microcosm, which starts with Newton's discovery of the gravitation theorem and then the discovery of quantum mechanics and relativity on this basis, which is enough to show that going from the macrocosm to the microcosm is a feasible way, but the gradual deduction of the macrocosm from the microcosm is God's work, just like the Big Bang."

"Isn't that good? It would be interesting to be able to reproduce the particle generation mechanics and scenes of the Big Bang, wouldn't it? Davis disagreed with Hawking's words and continued, "Moreover, from the current discoveries of physics, it is not without examples that the microcosm cannot be explained by the theory of relativity, and the failure of the KK theory has shown that it is time for us to take a different path." ”

"In the theory of relativity, it is said that the Big Bang began as a singularity with no time and no space, and there are no particles in nature, in other words, any rules of physics have no meaning at the singularity of the Big Bang, so it is a bit unrealistic to explain the force model of the unity of the universe from this point of view. So in my opinion, the so-called superstring theory is just the Chinese's conjecture, but it happens to conform to a certain mathematical formula and theorem, just like string theory was just a model used to explain strong interactions when it was first born, but it happens to be consistent with the Eulerian β function, so it has been taken seriously by the world, but the results show that quantum chromodynamics is better in this regard. ”

But quantum chromodynamics only explains strong interactions, and the other three forces, gravity, weak interaction, and electromagnetism, are not part of quantum chromodynamics. In fact, it is an undeniable fact that among the theories that have been proven to be right, there is no theory that can be used to perfectly explain the existence of gravitons, which cannot but be said to be a tragedy, but this article on superstring theory has made me see the prospect that the problem of gravity can be solved, so I will revise the direction of my research and engage in the study of superstring theory. Davis said in a firm tone.

"It seems that I can't convince you, but that's fine, maybe one day I'll follow the theory of the unification of the universe that you're pursuing, so good luck when you go first, Davis." Although Hawking's words are still the same kind of electronic-metal mixture, everyone can hear the deep regret in his words.

"I would like to write to invite this Chinese scholar to Cambridge for an academic visit, what do you think of this proposal?" After talking about academic issues, Davis also relaxed his serious expression, but his expression was still reserved.

Hawking was silent for a while, and said: "You can decide this matter, but I think it is better to ask for the opinions of Manu and others, if they all agree, then we can use the name of Trinity College of Cambridge University or Cavendish Laboratory of Cambridge University to invite this Mr. Junxin whom none of us know to do an academic visit, of course, you can also discuss it with Professor Michael Green of Queen Mary, I think Michael will be very happy to see this Mr. Junxin visit." ”

"Okay, I'll inform him, that's it for now, I'll go write first." Davis gestured to Hawking's head before turning and leaving the office.