Chapter 253: The scene is a bit out of control (one/three)

Cosmological constant,
A very magical existence.
Change to Xu Mang who was a minute ago. When facing this problem, he raised his hands in silence to indicate that he had surrendered. However, just after this minute, he evolved from a mortal to learn God, and he understood in an instant. The cosmological constant.
at this time,
The other students were sympathetic to Xu Mang’s experience. They didn’t mean to ridicule. After all, a terminally ill person had to be physically insulted at the last moment of his life. It was so miserable.
A male student sitting near Xu Mang said to Xu Mang cautiously: "Xu Mang's cosmological constant is a kind of cosmic field strength, a term proportional to the metric tensor."
however
The voice was so small that Xu Mang did not 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 letting me talk about the cosmological constant, I am afraid it will delay your class time and the students' acquisition and enjoyment of knowledge. happy."
"???"
"???"
"???"
Damn it!
Is this the flying self before dying?
The 30 or so students in the theoretical physics class that were present looked at Xu Mang in horror. Could this be the answer?
The professor is also a hard-tempered. He has long held great opinions on Xu Mang lying on the table all day. It is not because he is uneasy to learn. On the contrary, he holds a positive attitude towards Xu Mang’s IQ. It won't get so many achievements besides physics.
The professor was worried that Xu Mang's appearance of salted fish all day long would affect the surrounding students. The most important thing for learning is an atmosphere, and an example is needed.
It is clear,
Now this atmosphere is destroyed, and the example is gradually distorted.
"can!"
"The next time is your time 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, I'm used to taking classes at ordinary times. I take advanced mathematics classes for students majoring in optics."
After Xu Mang’s reminder, many talented people responded that he is actually a lecturer!
Nima,
It was also reported in September that everyone else was a double-department graduate student and became a lecturer in advanced mathematics, but he sat in the classroom and listened to the professor.
All are humans, why is the difference so big?
after that,
Xu Mang stood in front of the podium, returning a strange and familiar feeling.
"System I want all the contents of the cosmological constant!"
I rely on!
Is it so expensive?
However, the arrow had to be sent on the string.
Xu Mang could only pay 1,500 skill points.
By the way,
The memory mode is turned on.
After all, it took so many skill points to explain a cosmological constant, so why should we remember this knowledge?
"Ahem!"
"If you want to know what the cosmological constant is, then I must start with Einstein's general theory of relativity." Then Xu Mang wrote a field equation on the blackboard, and then turned around and said to the students: "You should know this. What is it, right? This is Einstein's field equation, depicting universal gravitation 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 abandoning the law of universal gravitation. The curvature of space is just a fine-tuning of Galileo and Newton's theories.
"Here is energy, and here is the shape of space-time." Xu Mang said: "This is an equation based on a static universe, used to calculate the universe."
"but"
"The equation calculated by this equation is a dynamic universe." Xu Mang paused: "Dynamic universe doesn't need me to explain, right?"
The students present shook their heads, showing that they don't want any special nonsense!
"Oh"
"At that time, Einstein believed that the universe was static and that the universe should remain still." Xu Mang wrote another field equation, but this time it included one 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 envisioned."
"As long as you give a certain value, you can keep the universe still and no longer change." Xu Mang continued: "Unfortunately, even if you add this cosmological constant, 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 committed the greatest crime in his life. The mistake of adding an unnecessary cosmological constant."
This
The professor standing under the podium was a little surprised listening to Xu Mang's popular science.
Originally thought Xu Mang was just a brief introduction to the cosmological constant. Who knew that this guy had recounted the past life of the cosmological constant, and the description was so concise and easy to understand, he was a talent!
the following
It should be the point!
Hope Xu Mang can bring some surprises!
The professor knows that the previous introduction is not important, but the latter content is important.
"However, a mistake made by Einstein unintentionally brought an unsolved mystery to the world." Xu Mang said solemnly: "The cosmological constant has been given the physical equivalent of vacuum energy, that is, it exists in the background of space. Energy, which is dark energy."
after that,
Xu Mang was out of control.
From dark matter speculation to overthrowing the theory of the Great Collapse, from the question of cosmological constants to the theory of quantum gravity, from the assumption that the vacuum has force properties to the theory of inflation.
Xu Mang went further and further on the road of pretending to be forced,
Never looking back.
And the scene gradually started to get out of control.
""
""
""
Endless?
Is it over?
You can't get down from standing on it, right?
The classmates were going crazy. After marveling at Xu Mang's knowledge, they felt that this was a large-scale acting scene, but they became the innocent backdrop behind Xu Mang's acting.
A simple cosmological constant involves so many things, and even some theories are unheard of, such as the extremely nonsense theory of the Great Rupture of the Universe. What happens after ninety billion yuan, you say a thread!
at this time,
Xu Mang is talking about quantum field theory in curved space-time. This concept is used to prove the black hole thermal radiation proposed by Professor Hawking, namely Hawking radiation.
But the students turned their attention to the professor, hoping that he could stop this large-scale coercion scene.
unfortunately
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 about his dry mouth on stage that he realized that the get out of class was over.
"Ahem!"
"Professor, my voice is dumb." Xu Mang looked at the professor beside him, and said helplessly: "Can get out of class be dismissed?"
"get out of class end!"
Suddenly,
All the students fled the scene one after another, for fear of being caught by Xu Mang late.
When Xu Mang was holding a physics book and was about to go to the sophomore classroom of optics, he was caught by the professor.
"Xu Mang?"
"When did you learn astrophysics secretly?" the professor asked curiously: "It looks good and good."
"Dream." Xu Mang said with a grin.
""
"Don't make trouble in front of me, otherwise, you have to retake my compulsory course, know?" The professor said with a black face and helplessly.
I go!
This is really what teachers all over the world are like. Isn't this my means to threaten optical students?
"Then what"
"Professor your name?" Xu Mang asked curiously.
""
"November!" The professor looked at Xu Mang and said seriously: "Two months have passed, you can't remember my name?"
"Uh"
"It's really raining and I don't know what to do." Xu Mang said, "I had not many classes in two months. I was either caught by this as a coolie or by the other as a laborer."
Hearing Xu Mang's complaint, the professor smiled and said silently: "I am very interested in your light pressure conjecture. You said light pressure may cause accelerated expansion of our four-dimensional universe. What is your opinion?"
"I'm talking nonsense"
"Fucking classmate." Xu Mang didn't know why the system gave the light pressure conjecture, and then said: "It may be because when the gravitational force of a star is less than the light pressure, the star will expand, and when the gravitational force is equal to the light pressure, the star will be in In a stable state, it is deduced from this viewpoint that light pressure is related to dark matter."
Oh?
interesting!
This is a very bold guess.
As the professor was about to speak, Xu Mang hurriedly said: "Professor, I am going to give a lecture, it's too late!"
Words fall,
Xu Mang ran away directly.
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, Fang, and said with a serious face: "You can't let Xu Mang run wild anymore. This is a waste of his talent!"
Director Fang looked confused, Xu Mang's physical level is very high?
Are you kidding me?
"Professor Zhong!"
"Are you sure Xu Mang's physics level is very high?" Director Fang asked incredulously, "Should you say it was optics?"
"No no no!"
"His level is very high in the three aspects of relativity, quantum mechanics and astrophysics!" The professor said seriously: "Today he gave me a huge surprise. Although nonsense, some bold ideas surprised me."
"what?"
"What did this kid do?" 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 and said, "The details of the content are simply outrageous, and even some of them are not covered by me. know."
This
is it possible?
When Director Fang heard the professor's words, he was immediately caught in doubt. Two and a half hours ago, he was an idiot who knew nothing about physics. Now he suddenly transformed himself into a genius who crushed university professors.
"Professor Zhong!"
"Are you sure he's not making up nonsense?" Director Fang asked: "The level of Xu Mang's performance in theoretical physics before, UU reading www.uukanshu.com is simply horrible."
"I wonder too!"
"Let me ask, Xu Mang, except for the first few days of school to listen to the lectures carefully, and take notes attentively, he almost can't afford it in the rest of the time." The professor was also full of doubts: "Why is it so powerful all of a sudden?"
For a while,
The two were lost in 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 states, etc.
"Academician Fang."
"Who made this paper?" the professor asked.
"I will come personally!"