The f * ck?
God Lu?
My idol!
When Zhang Zhongqing saw the person standing up, he nearly dropped his glasses on the ground.
When he thought about how this big name sat in his classroom and listened to his lecture for half a day, he was both surprised and happy. It was like he had won the lottery. He was surprised because he didn't notice. He was happy because he could brag to people that he taught a Nobel Prize winner.
However, even though Zhang Zhongqing had mixed feelings, Lu Zhou didn't feel anything.
The classroom itself was one of the places for academic exchanges.
When he was at Princeton, he often asked his students to lecture for him.
In his opinion, academic exchanges didn't care about status or honor.
"Professor Lu, please." Professor Zhang immediately made a gesture and respectfully stepped away from the podium.
"No need to be so polite, I just have some ideas."
Lu Zhou looked at his humble gesture and smiled awkwardly.
Being polite would waste too much time.
Not to mention, he wasn't a polite person.
Lu Zhou walked in front of the blackboard and picked up a piece of chalk.
"This kind of problem isn't something an undergraduate student can solve. In addition to a deep understanding of quantum chromodynamics, it also requires a deep mastery of functional analysis."
Lu Zhou paused for two seconds before he continued, "However, it's actually not as complicated as everyone thinks."
Lu Zhou printed the chalk on the blackboard. He wrote on the blackboard while he did some calculations.
"Starting from the field theory, make a Feynman diagram, and use the Feynman rule to calculate the scattering amplitude, we can get …"
[iM = (ig ²/| p '-p | ² + mφ ²) 2m ^ ss' · 2mδ ^ r ']
[…]
"Where mφ represents the mass of the corresponding boson, and g comes from the coupling constant in the interaction Lagrangian. Combined with Professor Zhang's previous calculation steps, V (q) can be obtained from the scattering cross section … "
[V (q) = -g ²/(| q | ² + mφ ²)]
Lu Zhou stopped writing and looked back at the classroom. The students were either muddled or listening attentively. He smiled and spoke.
"The above is considered simple, but the next step will require some techniques."
All the students: "…"
MMP！
How was it simple???
Zhang Zhongqing, who was watching from the side, was also at a loss.
It wasn't that he couldn't understand it, but he couldn't believe that someone could deduce these things on the spot in such a short period of time.
Could it be that this person didn't even need to spend time thinking about calculations?
If that was the case, then it would be too terrifying …
Lu Zhou didn't stop at all. He turned around and faced the blackboard again as he spoke casually.
"Perform an inverse Fourier transform on it!"
The sound of chalk rubbing against the blackboard was getting faster and faster, and Zhang Zhongqing, who was standing at the side, was getting more and more shocked. As for the students in the audience, they looked at the blackboard blankly. Even the top student who had already flipped through the textbook was at a loss when faced with the complicated calculation process.
Lu Zhou didn't notice their expressions; he was completely immersed in his own world.
Admittedly, these were some very basic things, but they weren't basic enough to appear on an exam paper.
However, as he thought about these basic problems, as more and more steps appeared on the blackboard, he began to understand more and more.
Why can the strong interaction force only work at a very short distance?
Or in other words, why can nucleons only form atomic nuclei at a very short distance?
The answer was obvious …
[…]
[V (r) = -g ²/4πr · e ^ (-mφr)]
The chalk in Lu Zhou's hand stopped writing. He looked at the calculations on the blackboard and spoke slowly.
"The electromagnetic interaction exchanges photons, and the photon mass is zero. Therefore, for the electromagnetic interaction, V is proportional to 1/r.
"The nuclear force is provided by the meson between the nucleons, which has a mass of about 200 MeV. The calculation shows that only the distance is on the order of 10 to the minus 14. Only the nuclear force between the two protons can offset the electromagnetic repulsion between the protons, resulting in a fusion reaction. "
The first row of students began to applaud.
It was like a wave crashing against the shore, spreading to the back.
Professor Zhang, who was standing next to him, also began to clap.
For most students, this was just a show.
However, for Lu Zhou, he saw a simpler solution for the nuclear force distance … At least it was much simpler than the two methods he remembered.
Unbelievable, all of this was done in less than ten minutes …
At this moment, he was the only one who knew how shocked he was.
On the podium.
Although the classroom was filled with applause, Lu Zhou, who was standing in front of the blackboard, was still immersed in his own world. When the applause stopped, he did not even notice it.
For the previous simple problem, this step was the end of the calculation.
However, this wasn't the only problem he was thinking about.
According to quantum field theory and quantum chromodynamics, the four fundamental forces and traditional particles could be unified.
For example, the components of the electric field could be constructed as non-commutative operators at different locations in spacetime. When constructing the Hilbert space of these operators, the traditional particles, such as electrons, could be reinterpreted as the quantization of the Dirac field.
This way, the difference between the field and particles would disappear.
Could a simple mathematical form be used, like the Einberg Salam-Glasho weak electric unified theory, which used a unified way to describe the electromagnetic force and the weak interaction force, to describe the strong interaction force and unify it with the electromagnetic force?
Answering this question wouldn't solve the miniaturization of controllable fusion, nor would it bring any degree of innovation to existing controllable fusion technology. However, intuition told Lu Zhou that if he could solve this problem theoretically, he might be able to provide a clue or a way to solve this problem …
Of course, this wasn't easy to do.
For example, the strong interaction force was different from the weak interaction force, it had a very typical problem …
The bell rang, but Lu Zhou was still standing there, as if he was thinking about something.
Zhang Zhongqing saw that Lu Zhou didn't respond, so he didn't want to interrupt Lu Zhou's train of thought.
About ten minutes had passed.
Lu Zhou stared at the concise calculations on the blackboard and suddenly spoke to himself.
"How do I explain the existence of the Yang-Mills existence and mass gap in mathematical terms?"
When Zhang Zhongqing heard this question, he paused for a second. His face turned red, and he stuttered like a student.
"… I really don't know how."
"I didn't ask you, you definitely don't know how …"
Lu Zhou spoke to himself and left the blackboard full of equations. He then turned around and left the classroom, leaving the stunned professor and students behind.
No one could answer this question.
After all, this was one of the most difficult unified field theories in particle physics.
It was also one of the seven millennium problems recognized by the international mathematics community …
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