I Don’t Want to Win Lying Down

cosmological constant,

A very magical existence.

If it were Xu Mang a minute ago, when faced with this question, he would have silently raised his hands to indicate that he had surrendered. However, just a minute later, he evolved from a mortal to a god of learning, and he understood it in an instant. The thing about the cosmological constant.

at this time,

The other students sympathized with Xu Mang's experience. They didn't mean to laugh at it. After all, a terminally ill person was humiliated by physics at the last moment of his life. It's so fucking tragic.

A male student sitting near Xu Mang cautiously said to Xu Mang, Xu Mang's cosmological constant is a cosmic field strength, a term proportional to the metric tensor.

However

The voice was so low that Xu Mang didn't hear it.

professor!

Are you asking me to talk about the cosmological constant? Xu Mang stood up and said with a serious face, If you insist on asking me to talk about the cosmological constant, I'm afraid it will delay your class time and the time for students to acquire and enjoy knowledge. hapiness.

???

???

???

Fuck!

Is this the release of self before death?

The thirty or so students in the theoretical physics class present looked at Xu Mang in horror. Could it be that this is the flashback?

The professor is also a tough-tempered person. He has long had a big opinion on Xu Mang lying on the table all day long. It's not because he dislikes Xu Mang's hard-to-learn, but he has a positive attitude towards Xu Mang's IQ. Nor will there be so many achievements other than physics.

What the professor was worried about was that Xu Mang's acting like a salty fish all day long would affect the surrounding students. The most important thing in learning is an atmosphere, and a role model is needed.

It is clear,

Now this atmosphere is destroyed, and the role models are gradually distorted.

Can!

The next time is for you to talk about the cosmological constant. The professor nodded.

Then me

Can I stand in your place? Xu Mang said with a smile on his face, I'm sorry, Professor, but I'm used to taking classes as usual, and I teach advanced mathematics for students majoring in optics.

After Xu Mang's reminder, many people realized that he was actually a lecturer too!

Nima,

It was also reported together in September. Others are graduate students with dual departments and have become a lecturer in advanced mathematics, while I am sitting in the classroom and listening to the professor's lecture.

They are all human, why is there such a big difference?

after,

Xu Mang stood in front of the podium, and a strange yet familiar feeling came back.

I want all the contents of the cosmological constant for the system!

I rely on!

so expensive?

However, the arrow had to be fired on the string.

Xu Mang could only pay 1,500 skill points reluctantly.

By the way,

Memory mode is on.

After all, it took so many skill points to explain a cosmological constant, why should we remember this knowledge?

Ahem!

If you want to know what the cosmological constant is, then I have to start with Einstein's general theory of relativity. Afterwards, Xu Mang wrote down a field equation on the blackboard, then turned around and said to the students, You should know this What, yes, the Einstein field equations, which describe gravity as the curvature of space.

The concept of space curvature,

All the students present understood that this concept has been verified in the macroscopic universe. Of course, this does not mean abandoning the law of gravity. The curvature of space is just a fine-tuning of Galileo and Newton's theories.

This is energy, and this is the shape of space-time. Xu Mang said, This is an equation based on the static universe, used to calculate the universe.

but

This equation calculates a dynamic universe. Xu Mang paused for a moment, I don't need an explanation for the dynamic universe, does it?

The students present shook their heads one after another, expressing that they don't want to talk nonsense!

oh

At that time, Einstein believed that the universe was static, and the universe should remain static. Xu Mang wrote down another field equation, but this time it included a term, the gv universe term.

By the way,

Under this universe item, two wavy lines are drawn.

This is when Einstein raised his hand, and suddenly added something, which is the cosmological constant gv. Xu Mang paused, and said silently, It is an unknown cosmic energy he imagined.

As long as a certain value is given, the universe can be kept static and no longer change. Xu Mang continued, Unfortunately, even if this cosmological constant is added, the calculated universe is still dynamic.

Later

Edwin Hubble discovered that the universe is expanding, how he discovered it, and how he proved it, Mr. Xu will not explain too much here. Xu Mang smiled: Then Einstein felt that he had made the biggest mistake in his life. mistake, adding an unnecessary cosmological constant.

this

The professor standing under the podium was a little surprised when he heard Xu Mang's science popularization.

Originally, I thought Xu Mang was just briefly introducing the cosmological constant, but who would have thought that this guy would describe the past life of the cosmological constant in such a concise and easy-to-understand manner, what a talent!

under

It should be the point!

I hope Xu Mang can bring some surprises!

The professor knows that the previous introduction is not important, but the latter content is important.

However, one of Einstein's mistakes unintentionally brought an unsolved mystery to the world. Xu Mang said seriously: The cosmological constant is endowed with a physical equivalent to vacuum energy, which exists in the background of space. energy, dark energy.

after,

Xu Mang was out of control.

From the speculation of dark matter to overthrowing the theory of big collapse, from the problem of the cosmological constant to the theory of quantum gravity, from the assumption that the vacuum has force properties to the theory of inflation.

Xu Mang went farther and farther on the road of pretending,

Don't look back.

And the scene gradually began to get out of control.

Is it over?

Is it over?

You can't stand on it, can't you?

The students were going crazy. Apart from marveling at Xu Mang's profound knowledge, they felt that this was a large-scale pretense scene, and he became the innocent background behind Xu Mang's pretense.

A simple cosmological constant actually involves so many things, and even some theories are unheard of, such as the extremely nonsense theory of the Great Rip in the Universe, what will happen after 90 billion, what a joke!

at this time,

Xu Mang was talking about the quantum field theory of curved space-time. This concept is used to prove the thermal radiation of black holes proposed by Professor Hawking, that is, Hawking radiation.

But the students turned their attention to the professor, hoping that he could stop this large-scale pretense scene.

pity

The professor was very interested in Xu Mang's opinion, and he was fascinated by it.

a full hour and a half,

It wasn't until Xu Mang talked dry on stage that he realized that get out of class was over.

Ahem!

Professor, my voice is hoarse. Xu Mang looked at the professor next to him, and said helplessly, Can you finish class?

get out of class is over!

suddenly,

All the students fled the scene one after another, for fear of being caught by Xu Mang too late.

Just when Xu Mang was about to go to the sophomore classroom of optics with his physics book, he was caught by the professor.

Xu Mang?

When did you learn astrophysics secretly? The professor asked curiously, It seems to be very good.

When dreaming. Xu Mang said with a smile.

Don't make trouble in front of me, or you will have to retake my compulsory course, you know? the professor said helplessly with a dark face.

I go!

This is really the same as teachers all over the world, isn't this my way of threatening students majoring in optics?

then what

Professor, what's your surname? Xu Mang asked curiously.

It's November! The professor looked at Xu Mang and said seriously, Two months have passed, and you still can't remember my name?

Well

It's really raining and I have nothing to do. Xu Mang said, I didn't take many classes in two months. Either I was caught as a coolie by this one, or I was caught as a laborer by that one.

Hearing Xu Mang's complaint, the professor smiled and said silently, I'm very interested in your light pressure conjecture. You said that light pressure may cause accelerated expansion of our four-dimensional universe. What's your point of view?

I'm talking nonsense

Student fooling you. Xu Mang didn't know why the system guessed the light pressure, and then said: It may be because when the gravity of a star is less than the light pressure, the star will expand, and when the gravity is equal to the light pressure, the star will be at Stable state, from this point of view, it can be deduced that light pressure is related to dark matter.

oh?

interesting!

This is a very bold guess.

When the professor was about to speak, Xu Mang hurriedly said, Professor, I'm going to give a lecture, it's too late!

words fall,

Xu Mang ran away.

Looking at this figure, the professor came up with an idea.

Academician Fang.

Xu Mang's physics level is very high! The professor found Director Fang of the Department of Physics, and said seriously, We can't let Xu Mang run around anymore, it's a waste of his talent!

Director Fang looked confused. Xu Mang's physics level is very high?

Are you kidding me?

Professor Zhong!

Are you sure Xu Mang has a high level of physics? Director Fang asked incredulously, You're not talking about optics, are you?

No no no!

In terms of relativity, quantum mechanics, and astrophysics, his level is very high! The professor said seriously: He gave me a huge surprise today. Although there is a lot of nonsense, some bold ideas surprised me.

What?

What did this kid do again? Director Fang asked.

I asked him to explain the cosmological constant, but it took him an hour and a half to pull out a lot of things for me. The professor laughed: The details of the content are simply outrageous, even some of which I haven't touched, and he actually Know.

this

is it possible?

When Director Fang heard the professor's words, he immediately fell into doubt. Two and a half hours ago, he was an idiot who knew nothing about physics, but now he suddenly transformed into a genius who crushed university professors.

Professor Zhong!

Are you sure he's not making up nonsense? Director Fang asked, Xu Mang's performance in theoretical physics before was simply appalling.

I wonder too!

Let me inquire. Apart from listening carefully to lectures and taking notes carefully in the first few days of school, Xu Mang can hardly afford to lie down in the rest of the time. The professor was also full of doubts: Why is he so powerful all of a sudden?

for a while,

The two fell into confusion.

finally,

Director Fang decided to give Xu Mang a separate test, and issued a very comprehensive test paper, including relativity, quantum mechanics, optics, solid state electronics, macroscopic quantum states, and so on.

Academician Fang.

Who published this paper? the professor asked.

I'll come in person!