Chapter 254

The cosmological constant,

is a very magical existence.

A minute ago, Xu mang raised his hands in silence to show that he had surrendered when facing this problem. However, just one minute later, he evolved from a mortal to a God, and instantly understood the universal constant.

At this time,

other students sympathized with Xu Mang's experience, and they didn't mean to laugh at him. After all, a man suffering from a terminal illness had to be insulted by physics at the last moment of his life. It was so tragic...

a male classmate sitting near Xu mang carefully said to him, "Xu mang... The constant of the universe is a kind of universe Field strength, a term proportional to the metric tensor. "

However...

the voice was too small for Xu mang to hear.

"Professor!"

"You want me to talk about the constant of the universe?" Xu mang stood up and said solemnly: "if you insist on asking me to talk about the cosmological constant, I'm afraid it will delay your class time and students' enjoyment of knowledge."

“？？？”

“？？？”

“？？？”

Sleeping trough!

Is this the release of self before death?

Thirty or so students in the theoretical physics class on the spot looked at Xu Mang in horror. Could it be that this is a reflection?

The professor is also a hard tempered man. He has long held great opinions about Xu mang lying on the table all day long. He is not disgusted with Xu Mang's learning difficulty. On the contrary, he holds a positive attitude towards Xu Mang's IQ. Otherwise, he would not have achieved so much except physics.

What the professor is worried about is that Xu Mang's appearance of salted fish all day long will affect the students around him. The most important thing in learning is an atmosphere and an example is needed.

Obviously,

now the atmosphere has been destroyed and the example has been distorted.

"Yes!"

"The next time is when you talk about the constant of the universe." The professor nodded.

"Then I..."

"can I stand in your position?" Xu mang said with a smile: "sorry, Professor, I'm used to... Usually I also have classes, for optical students, on advanced mathematics."

After Xu Mang's reminder, many talents responded that he was actually a lecturer!

Nima,

it was also reported in September that others were both graduate students of two departments and became a lecturer in advanced mathematics, while she was sitting in the classroom listening to the professor's lecture.

It's all human. Why is it so different?

After that,

Xu mang stood in front of the platform, feeling strange and familiar.

"System... I want the whole content of the cosmological constant!"

BR) > < 1 500 of the universe's ability values!

Is it so expensive?

However, there is no choice but to send.

Xu ninmang can only pay one thousand five hundred skills.

By the way,

turns on the memory mode.

After all, it takes so much skill value to explain a universal constant. How can you remember this knowledge?

"Cough!"

"To know what a constant is, I have to start with Einstein's general theory of relativity." After that, Xu wrote down a field equation on the blackboard. Then he turned to the students and said, "you should know what this is. Yes... This is Einstein's field equation, which describes gravity as the curvature of space."

The concept of space curvature,

all the students present understand that this concept has been verified in the macro universe. Of course, this is not to abandon the law of universal gravitation, but to fine tune Galileo and Newton's theory.

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

"But..."

"this equation calculates a dynamic universe." Xu mang pauses: "the dynamic universe does not need me to explain?"

The students at the scene shook their heads in succession, showing no special nonsense!

"Oh..."

"Einstein at that time believed that the universe was static, and that the universe should remain stationary." Xu mang wrote another field equation, but this time included a term, namely Λ * G_ UV cosmic term.

By the way,

under this cosmic term, two wave lines are drawn.

"This is Einstein raised his hand, suddenly added a thing, namely the cosmological constant - Λ * G_ uv。” Xu mang pauses for a moment and says in silence, "that is, an unknown cosmic energy he imagined."

"Given a certain number, we can keep the universe still and never change." "Unfortunately, even if we add the cosmological constant, the calculated universe is still dynamic," Xu said"Later..."

"Edwin Hubble discovered that the universe was expanding. How to discover it and how to prove it, Mr. Xu has no more explanation here." Xu mang laughed: "then Einstein felt that he had made the biggest mistake in his life, adding an unnecessary constant of the universe."

This is...

the professor standing under the platform, listening to Xu Mang's science popularization, looks a little surprised.

Originally thought Xu mang just introduced the cosmological constant briefly. Who knows this guy narrated the past life of the cosmological constant again, and the narration is so concise and easy to understand. He is a talent!

The following...

should be the key point!

Hope Xu mang can bring some surprises!

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

"However, a mistake made by Einstein inadvertently brings an unsolved mystery to the world." Xu said solemnly: "the cosmic constant is given the physical equivalent of vacuum energy, that is, the background energy existing in space, that is, dark energy."

After that, Xu mang was out of control.

From the conjecture of dark matter to the overthrow of the big collapse theory, from the cosmological constant problem to the quantum gravity theory, from the assumption that vacuum has the force property to the theory of inflation.

Xu mang went further and further on the road of "forced", and never looked back.

And the scene began to get out of control.

"..."

"..."

"..."

is it over?

Is it over?

You're standing on top of it, aren't you?

The students are going crazy. They are amazed at Xu Mang's profound knowledge and feel that this is a large-scale forced scene, but they have become the innocent background board behind Xu Mang's decoration force.

A simple cosmological constant actually involves so many things, even some theories are unheard of. For example, the extremely ridiculous theory of the great tear of the universe, what will happen after 90 billion years, you can say something!

At this time,

Xu mang is talking about the quantum field theory in curved space-time, which is used to prove the thermal radiation of black hole proposed by Professor Hawking, namely Hawking radiation.

But the students have turned their eyes to the professor, hoping that he can stop this large-scale installation scene.

Unfortunately...

the professor is very interested in Xu Mang's views, and he is fascinated by it.

For a whole hour and a half,

it was not until Xu mang said on the stage that his mouth was dry and his tongue was dry.

"Cough!"

"Professor... I'm hoarse." Looking at the professor on the edge, Xu mang said helplessly, "can we finish the class?"

"Class over!"

All of a sudden,

all the students fled the scene for fear of being caught by Xu mang.

When Xu mang was preparing to go to the sophomore classroom of optics major with his physics book, he was caught by the professor.

"Xu mang?"

"When did you learn astrophysics secretly?" The professor asked curiously, "it seems good, very good."

"When you dream." Xu mang said with a smile.

"..."

"don't make noise in front of me, or I will take this compulsory course again, do you know?" The professor said with a black face.

I'll go!

This is really the same as the teachers all over the world. Isn't this my way to threaten the students majoring in optics?

"What...

" Professor, what's your name? " Xu asked curiously.

"..."

"November!" The professor looked at Xu Mang and seriously said, "two months have passed, you can't remember my name?"

"Er..."

"this is really rain, I have no melon." "In two months, I didn't have many classes. I was either caught as a coolie by this one or a laborer by that one," Xu said

Hearing Xu Mang's complaint, the professor laughed and said quietly, "I'm very interested in your conjecture of light pressure. You say that light pressure may accelerate the expansion of our four-dimensional universe. What's your opinion?"

"What I said..."

"fooling my classmates." Xu mang did not know why the system gave the light pressure conjecture, and then said: "it may be because when the gravity of the star is less than the light pressure, the star will expand, and when the gravity equals the light pressure, the star will be in a stable state. From this point of view, it is inferred that the light pressure is related to dark matter."

Oh?

It's interesting!

This is a very bold guess.

When the professor was about to open his mouth, Xu mang said in a hurry: "Professor, I'm going to give a lecture... It's too late!"

Xu 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 the director of the physics department, and said seriously: "you can't let Xu mang run around any more. It's just a waste of his talent!"

Director Fang is confused, Xu Mang's physical level is very high?

You're not kidding, are you?

"Professor Zhong!"

"Are you sure Xu Mang's physics level is very high?" Director Fang asked in disbelief, "can't you say optics?"

"No, no, no!"

"He has a high level of relativity, quantum mechanics and astrophysics." The professor said seriously: "today, he gave me a great surprise. Although he was full of nonsense, I was surprised by some bold ideas."

"What?"

"What did the boy do?" Director Fang asked.

"I asked him to explain the constant of the universe, and it took him an hour and a half to pull a lot of things out for me." The professor said with a smile: "the details of the content are so disgusting that I didn't even touch on some of them. He even knew them."

Is this...

is this possible?

Hearing the professor's words, director Fang immediately fell into doubt. Two and a half hours ago, he was an idiot who knew nothing about physics. Now he suddenly changed and became the genius of a professor in crush University.

"Professor Zhong!"

"Are you sure he's not making up nonsense?" Director Fang asked, "before Xu Mang's level of theoretical physics, that is simply unbearable."

"I wonder, too!"

"I ask, Xu Mang in addition to the first few days of class, listen carefully, take notes carefully, the latter time almost can't get up." Professor is also full of doubts: "how suddenly so powerful?"

For a moment,

they fell into confusion.

Finally,

director Fang decided to give Xu mang a separate test and produce a comprehensive test paper, including relativity, quantum mechanics, optics, solid-state electron theory, macroscopic quantum state and so on.

"Academician Fang."

"Who wrote the paper?" Asked the professor.

"I'll come myself!"

......

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