Theoretical physics actually includes a lot of content.
Directions such as particle physics, quantum field theory, cosmology, etc. all belong to the category of theoretical physics.
Of course, regardless of the direction of refinement, the biggest difference between theoretical physics and experimental physics is that the former uses more mathematical methods to derive new discoveries on paper.
Therefore, in the physics community, people usually use one sentence to describe theoretical physicists and experimental physicists: theoretical physics is waste paper, and experimental physics is expensive.
Of course, based on the characteristics of theoretical physics, it is also the most suitable for Li Mu's ability.
After hearing Li Mu's words, the academicians present were not surprised.
"As expected, you still chose this."
Academician Ji Zhang sighed, then shook his head helplessly: "Okay, it seems it has nothing to do with me, but theoretical physics is indeed suitable for you. Of course, if you are also interested in nuclear fusion, you can also Come to me."
Academician Le Lin also said helplessly: "It's a pity that what I do is experimental condensed matter, not theoretical condensed matter. Otherwise, I can still fight for it."
Condensed matter is also divided into two directions: theory and experiment, and theoretical condensed matter also belongs to theoretical physics. As for experimental condensed matter, it is more inclined to verify the theory and derivative applications.
Other academicians also gave up.
Only Academician Yue Lang showed a smile on his face.
He is the only academician specializing in theoretical physics, especially in the fields of particle physics and quantum field theory.
He walked forward with a smile and patted Li Mu on the shoulder: "Very good. Theoretical physics is a very interesting subject. In it, you can understand the thoughts of many famous physicists in history, such as Einstein, Planck, Schrödinger.”
"When you study theoretical physics, you have a feeling of having a conversation with these physicists across time and space."
"Of course, the most important thing is that it requires mathematics."
"Your mathematical ability is beyond doubt, and I believe you will be able to thrive here."
Li Mu nodded and said with a smile, "I'm already looking forward to it."
"Hahaha! Okay!"
Yue Lang laughed.
Then he turned to look at the other academicians and said with a smile: "Brothers, I will accept it."
"You're lucky, old guy."
Several other academicians shook their heads, and then sent congratulations to Yue Lang.
As academicians of the same college, the relationship between them is naturally good, so there is not so much fussing over things.
At most, it's just a pity, losing a very outstanding student.
After confirming the mentor, Li Mu went to his office with Academician Yue Lang.
His office and laboratory are right next to each other, and there are a bunch of graduate students doing research inside.
When these students saw the big boss coming, they all shouted respectfully: "Hello, Academician Yue!"
Unlike Chen Shanping who personally leads students, Yue Lang's laboratory is a common laboratory arrangement in universities. Basically, junior tutors lead graduate students. As for himself, because he is usually busy, he rarely has time to take care of this. Graduate students, not to mention his own topic is not something ordinary students can study.
Therefore, it is rare for these graduate students to see the big boss.
Yue Lang was in a pretty good mood today. He responded to the students' greetings with a smile, and then said, "Here, let me introduce you to a new junior brother, Li Mu."
Li Mu also walked out from behind Yue Lang and waved to everyone in the laboratory, "Hello everyone."
Then, the graduate students present were stunned.
What?
Who is this……
Li Li Li...Li Mu? !
Oh my god, Li Mu has actually become their classmate?
Their big boss actually abducted Li Mu!
As for what Yue Lang said about his junior brother...
Just kidding, who dares to treat Li Mu as his junior brother?
Such a big guy...
Regardless of whether they are a doctor or a master, they can only express their admiration.
Of course, Yue Lang didn't waste any time and led Li Mu directly into his office.
"Let's not talk nonsense. I believe you don't like those trivial things either."
"Let's talk about academic matters directly."
"I have read all the physics-related papers you have written before. Generally speaking, they are very good and meet the graduation requirements of ordinary students."
"Of course, considering that you have already been so outstanding before, my graduation requirements for you will also be increased accordingly."
"I do not require that your graduation thesis must be submitted to top journals such as "Nature", "Science" or "PRL", but it must be like your "Electrodynamic Analysis of Electronic Behavior at the Interface of Two Types of Conductors". It can have a certain impact on the entire academic community.”
"You've done it once, and I believe you can do it again."
"Normally, I won't interfere with your research. You can do whatever you want. Of course, you can also work on projects with me."
"For now, if you don't have any ideas about the research direction, I suggest you come to me first."
"Although the problems you have studied before have some overlap with the cutting-edge research areas of theoretical physics, there is not much overlap, such as particle physics and quantum field theory."
"My current project is closely related to these two aspects, and it can also help you figure out what you want to study faster."
"It depends on how you choose."
"If you need funds, you can tell me. I can provide a certain amount of funds every year based on the topics you want to do."
"That's pretty much all I have to say, you can decide for yourself."
After Yue Lang finished speaking, he picked up the teacup next to him and took a sip, waiting for Li Mu to make a decision.
For a genius like Li Mu, Yue Lang was very clear about the training methods and could not force him to do anything.
Otherwise, it will only affect the performance of his talent.
Li Mu thought for a moment, and then asked: "Academician Yue, what is the project you are working on now?"
Yue Lang smiled, then directly pulled a piece of information from the side and handed it to Li Mu.
"This is it."
Li Mu took the information and saw that it read: [Existence verification of Zcs, a hidden charmed tetraquark state containing strange quarks].
"Do you know what this is?"
Yue Lang asked with a smile, obviously thinking of a test.
But for Li Mu's knowledge base, this is very simple.
"According to the standard model of particle physics, in addition to the 'traditional' hadrons, which are mesons composed of two quarks, or baryons composed of three quarks, there may also be four quarks or five quarks. and 'strange' hadrons made of pure gluons."
"So this Zcs should be one of them."
"It's like looking for a new kind of particle?"
Li Mu raised his head and looked at Yue Lang.
Yue Lang laughed, and then nodded slightly: "That's very good, that's it."
"Theoretical physics cannot be separated from quantum theory, and quantum theory cannot be separated from these elementary particles."
"So the discovery of new particles has become a hot topic that our theoretical physics is most committed to research."
"Of course, from a utilitarian point of view, as long as such a new particle is discovered, you can publish an article on nature and science."
"But in our academic world, it's better to be more utilitarian."
Yue Lang smiled and continued: "This four-quark particle can be considered one of them. The purpose now is to analyze the possibility of its existence from various experimental data, so what is especially needed is a mathematical master like you."
Li Mu nodded, and then asked curiously: "Then where do our experimental data come from? We can't have such a particle collider at Shanghai Jiao Tong University, right?"
Yue Lang waved his hands helplessly: "Of course this is impossible. If it were possible, I would be able to wake up laughing in my dreams."
"Our project is based on the Shangjing Institute of High Energy Physics and is analyzed based on the experimental data of the Shangjing Spectrometer III."
Li Mu nodded, expressing understanding.
The Shangjing Spectrometer III is a large-scale general-purpose magnetic spectrometer on the Shangjing Electron Positron Collider. It is mainly used to monitor and record relevant data generated in particle collisions.
It is obviously impossible for particle physicists in theoretical physics to directly observe what happens when particles collide.
There is currently no equipment that can help scientists directly observe this microscopic phenomenon.
Therefore, the most basic research method is to use various data recorded by the equipment, such as particle energy, trajectory, etc., and then use mathematical methods to process these data, and finally analyze the results.
"How about it? Do you want to come and study this project with me?"
Li Mu pondered for a moment and then said: "Since you have suggested so, let me give it a try first."
"good."
Yue Lang nodded, and then took another pile of information from the side.
"The information here is all relevant data. It contains the results of hundreds of thousands of collisions. I estimate that if it can be found, it should be able to find it from these data."
"You can take a look first. If you don't understand anything, just ask me."
Li Mu took the information, and the different types of information inside had been separated with clips.
"This stack is the statistics of flight time, and what is measured in it is the flight time of charged particles; this is the statistical result of the shower counter, which records the energy of various particles."
"Then there is also the recording position and beam brightness..."
Yue Lang taught Li Mu step by step how to understand these data, and also told him the functions of these data.
After all, it was the first time for Li Mu to get this kind of information, so of course he had to introduce Li Mu first.
Soon Li Mu initially grasped the meaning of these data and how they were obtained.
But after looking at it carefully for a while, his brows couldn't help but frown.
"Why do you feel that the data here... is a bit mixed? There are many data that exceed the error range several times."
Yue Lang smiled, with some helplessness on his face: "There is no way, our domestic particle collider is just like this. There is still a certain gap between the advanced level and the top foreign collider. When we compile the statistics, There is always a lot of noise. ”
"You should also be able to imagine that during this kind of experiment, noise is always inevitable. Even the earth's magnetic field, gravity, and ubiquitous electromagnetic interference will affect the accuracy of the measurement. Sex, so why those of us who study high-energy physics dream of building a collider on the moon is because we can greatly escape this influence."
"All right."
Li Mu had no choice but to accept this reality.
I have to sigh with emotion.
Even if the research is theoretical physics, it still relies on experiments.
Just like Yang Zhenning and Li Zhengdao, after proposing the law of non-conservation of parity, the physics community couldn't believe it, because this overturned the law of parity conservation that the physics community had always insisted on, so their paper was published in It was not recognized at first.
It was not until later that another physicist Wu Jianxiong carefully designed experiments that the law of parity non-conservation was verified, allowing them to win the Nobel Prize in Physics.
This is how experimental physics and theoretical physics complement each other and coexist closely.
Next, Li Mu continued to read. Yue Lang rarely went about his own business and waited quietly beside him. He occasionally went to the laboratory to ask how his students were doing recently.
Time passed quickly. From noon to afternoon, Li Mu stayed in Yue Lang's office, looking at the data.
When it was time for lunch, Yue Lang returned to the office from the laboratory. Seeing Li Mu's serious look, his eyes were filled with relief and emotion.
Being able to look at these boring data for so long, it is no wonder that Li Mu has made such great achievements.
Then, he greeted Li Mu: "Okay, let's go eat first, don't worry too much. "
But Li Mu said at this time: "You go and eat first. I have some ideas about these data now."
"Huh? What do you think?" Yue Lang was stunned.
Although I watched it all afternoon, it was indeed quite a long time, but what can I think about it?
Li Mu took the paper and pen from the side: "Denoise these data."
Yue Lang: "???"
Using mathematical methods to denoise experimental data is indeed a common method, and it has always been a direction attempted by researchers at major particle colliders.
However, unlike Li Mu's noise reduction method, their noise reduction methods generally determine the algorithm and then write it into the computer of the monitoring and statistical equipment. Then, during the process of data collection by these equipment, the noise reduction is completed directly. In this way It also ensures that the real data during particle collision will not be affected.
However, if Li Mu starts directly from the experimental data that has been obtained, it is very likely to affect the real data. In the end, not only will the noise reduction not be achieved, but it will even affect the authenticity of the data.
This can no longer be called noise reduction, but rather "repair".
It's like repairing those low-quality movies from the last century to make them higher-quality. It's very troublesome. If you're not careful, the original picture may be distorted.
What's more, how long has Li Mucai been watching, can he really do it?
Yue Lang couldn't help but have such questions in his heart.
However, since Li Mu dares to do this, it means that he is already sure.
In fact, his brain computer has been thinking about this since he got this data.
And with the help of the computer in his mind, doing this was far easier than Yue Lang imagined.
In just a moment, Li Mu completed the repair of the first collision energy data.
And this repaired data suddenly returned to within the error range of twice the confidence interval!
Yue Lang next to him was shocked.
Just relying on this noise reduction method, Li Mu was invited by various high-energy physics research institutions around the world!
even……
If this method was systematically summarized into a paper and published, maybe it would directly meet the graduation requirements he told Li Mu just at noon?
Can you graduate on the first day of entry?
…
[I went out to do errands the past two days. I may have been in the sun today and am a little out of sorts. I’ll just write 8k words today. I’ll continue after more updates]
(End of chapter)
