Xueba starts with change

Chapter 631

In the eyes of all the students inside and outside the classroom, Chen Zhou stepped onto the podium.

"Students, good afternoon, long time no see..."

Flipping through the textbook, Chen Zhou said with a smile.

As Chen Zhou said, after the last trial class in the Department of Mathematics and Department of Physics, he never taught these students again.

Of course, the number theory class that just ended in the morning is definitely not counted.

"Professor Chen, you should also come to give us more classes! We like to listen to your classes!"

"That's right, Professor Chen, young people should be with young people. You are always with those middle-aged old men, and your mentality is getting old!"

Students in the physics department seem to be skinier than students in the mathematics department.

As soon as Chen Zhou finished speaking, some of the students in the audience started booing.

Hearing this, Chen Zhou couldn't help laughing.

These students are really not afraid of those professors, and they actually called someone else's old man...

If those professors knew about this, they would probably be depressed for a long time.

"Okay, I promise you..." Chen Zhou pressed his hands down to stop the kind noise, "As long as I have time, I will come to teach you, okay?"

"it is good!"

Almost in unison, the students inside and outside the classroom shouted together.

Their expressions also looked a little excited.

Seeing this scene, Chen Zhou smiled again.

Raising his hand and looking at his watch, Chen Zhou said: "Now I have promised you, then, we will officially start the class! Please turn the book to Chapter 3, the one-dimensional steady state problem, we will Let's start from here..."

The textbook for the course Quantum Mechanics in the Physics Department of Yanda University was written by Zeng Jinyan, a professor of Yanda University.

In addition to the basic knowledge of quantum mechanics, Professor Zeng also included in the book the main new developments in quantum mechanics in experiments and theory in the past 20 years, and gave a systematic introduction.

Compared with Chen Zhou's previous study at Yanda University, this textbook has also been revised again.

However, the content is roughly the same.

Chapter 3 One-dimensional steady state problem, starting from the general properties of one-dimensional steady state, to square potential well, one-dimensional scattering, one-dimensional harmonic oscillator, delta potential, the relationship between bound energy level and scattering amplitude pole, etc... …

Although there was a lot of content, Chen Zhou was the same as in the morning. He spoke in a regular and rhythmic manner, using a detailed and appropriate method, and finished his speech quickly.

Then there is Chapter 4, on the expression of mechanical quantities by operators.

When talking about this chapter, Chen Zhou explained the contents of the book in detail.

When he talked about the eigenvalues ​​and eigenfunctions of the Hermitian operator, he also explained to this group of students the new formula about the eigenvalue eigenvariables that he discovered.

The content of the new formula itself is not too difficult.

The main thing is the practical application.

It just so happens that there are examples here, so Chen Zhou briefly explained them.

The students listening to the class in the audience quickly recognized that what Chen Zhou was talking about was the result of his previously published thesis.

For a moment, these people were as excited as if they had been injected with chicken blood.

In addition to the two ears that have been pricked up, the pens in their hands are also rapidly recording.

At noon, they heard that Chen Zhou explained the content of the distribution deconstruction method to the students in the number theory class.

They are still envious.

Unexpectedly, this kind of happiness came to him in the afternoon.

This great sense of satisfaction is indescribable.

Soon, news of what Chen Zhou was talking about, and what it was, also spread inside and outside the classroom.

The atmosphere of the entire classroom has also become more intense.

Whether in the classroom or outside the classroom.

Every student looked at Chen Zhou with a hint of excitement.

You know, this is tantamount to a simple report meeting, or the kind that teaches you by hand.

How can these students not be excited?
Chen Zhou also noticed the changes in the students, and he just smiled knowingly.

Still according to his own rhythm, explain this part of the content to these students in an orderly manner.

It's just that the content of the textbook in the first two chapters is not as long as the explanation of Chen Zhou's new formula...

"... From this, we can also see that this formula has a very practical role in solving the eigenvalues ​​and special variables. You can understand it well. eigenfunction, a great help..."

It took nearly half an hour before Chen Zhou finished the "simple" explanation.

Glancing at the teaching materials on the desk, Chen Zhou didn't push the content of Chapter 5 in a hurry, but gave these students some time to digest the content just now.

Although Chen Zhou felt that the new formula itself was not too difficult.

But compared with the content in the textbook, the depth of the new formula is still deeper.

After waiting for about 5 minutes, Chen Zhou no longer gave these students too much time.

He began to advance this lesson to the next chapter, which is Chapter 5, the deepening and symmetry of forces over time.

"5.1 The evolution of mechanical power over time is the content of the introduction. You can see for yourself, so I won't talk about it..."

"5.2 The movement of the wave packet and the Ellenfest theorem are relatively simple, you can see for yourself, but if you want to know more about the Ellenfest theorem, you can study the Heisenberg painting , Hamiltonian mechanics, and the famous Schrödinger equation, it's quite interesting..."

"The same is true for the Schrödinger image, Heisenberg image, and interaction image of 5.3. The content of the textbook is a bit simple, and the depth is not enough. If you want to study it, you can check some literature..."

Chen Zhou quickly skipped the first three quarters.

The content of these three verses, as he said, is interesting.

However, the depth of the textbook is not enough to reach the level of interest.

And the content in the textbook, Chen Zhou felt that these students could just read it by themselves.

If you really want to learn more, then rely on self-study to check the literature.

This is also a skill that university students most need to master.

Glancing at the content of "5.4 Preliminary Analysis of the Relationship between Conserved Quantity and Symmetry" in the textbook, Chen Zhou just wanted to continue the rhythm just now and skip this part of the content.

When it came to the mouth, it became: "In classical mechanics, the symmetry of the conservation of momentum is the invariance of space translation, the symmetry of the conservation of angular momentum is the invariance of space transfer, and the symmetry of the conservation of energy is the invariance of time translation... ..."

After saying this, Chen Zhou glanced at the textbook again.

Immediately, he began to combine the textbooks and began to explain this part of the content in detail.

The reason for such a change was the reason why Chen Zhou's words changed again.

All because the relationship between conserved quantities and symmetry is also part of his current research topic.

That's right, part of the study of gauge theory and the Yang-Mills equations...

(End of this chapter)