Ultimate Scholar

Theoretical physics actually includes a lot of content.

Such as particle physics, quantum field theory, cosmology, etc., all belong to the category of theoretical physics.

Of course, no matter what the direction of refinement is, the biggest difference between theoretical physics and experimental physics is that the former uses mathematical methods to derive more on paper, so as to obtain new discoveries.

Therefore, in the field of physics, people usually use one sentence to describe theoretical physicists and experimental physicists: theoretical physics waste paper, experimental physics costs money.

Of course, based on the characteristics of theoretical physics, it is also the most suitable for Li Mu's ability.

Hearing Li Mu's words, the academicians present were not surprised.

"Sure enough, you still chose this."

Academician Ji Zhang sighed, then shook his head helplessly: "Okay, it seems that it has nothing to do with me, but theoretical physics is really suitable for you, of course, if you are also interested in nuclear fusion, you can also Come find me."

Academician Le Lin also said helplessly: "Unfortunately, all 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. Theoretical condensed matter also belongs to theoretical physics. As for experimental condensed matter, it is more inclined to verify theory and derivative applications. \b

Other academicians have also given up.

Only academician Yue Lang showed a smile on his face.

He is the only academician who specializes in theoretical physics, especially in particle physics and quantum field theory.

He walked forward with a smile, and patted Li Mu on the shoulder: "Very well, theoretical physics is a very interesting subject, in which you can understand the thoughts of many famous physicists in history, such as Einstein, Planck, Schrödinger."

"When you study theoretical physics, you have a sense of dialogue with these physicists across time and space."

"Of course, the most important thing is its requirement for mathematics."

"Your mathematical ability is unquestionable, and I also believe that you can play like a duck in water."

Li Mu nodded and said with a smile, "I'm already looking forward to it."

"Hahaha! Good!"

Yue Lang laughed.

Then he turned his head to look at the other academicians, and said with a smile: "Brothers, then I will accept it."

"Lucky you old bastard."

Several other academicians shook their heads, and then congratulated Yue Lang.

As academicians of the same academy, the relationship between them is naturally considered good, so there is not so much haggling.

At most, there is only a little pity, losing a very good student.

After confirming the mentor, Li Mu and academician Yue Lang went to his office.

His office and laboratory are together, and there are a bunch of graduate students doing research.

When these students saw the big boss coming, they all shouted respectfully: "Hello, Academician Yue!"

Unlike Chen Shanping who leads the students in person, Yue Lang's laboratory belongs to the common laboratory arrangement method in colleges and universities. Basically, the graduate students are led by the junior tutor. As for him, he is usually busy and has little time to take care of these things. Graduate students, not to mention his own topic is not something that ordinary students can study.

Therefore, it is rare for these graduate students to meet the big boss once.

But Yue Lang was in a pretty good mood today, he responded to the students' greetings with a smile, and then said, "Come on, 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, "Hi everyone."

Then, the graduate students present were immediately stunned.

What?

Who is this……

Li Li Li... Li Mu? !

Oh my god, Li Mu has become their fellow disciple?

Their big boss actually abducted Li Mu!

As for what Yue Lang said about the younger brother...

Just kidding, who dares to treat Li Mu as a junior?

This kind of boss...

Regardless of whether they are doctors or masters, they can only express their admiration.

Of course, Yue Lang didn't talk nonsense, and directly led Li Mu into his office.

"Let's not talk about other nonsense, I believe you don't like those trivial things."

"Speak directly about academic matters."

"I have read all the physics-related papers you wrote before, and they are generally very good, and they have reached the graduation requirements of those ordinary students."

"Of course, I also considered that you were already so outstanding before, so I will increase your graduation requirements accordingly."

"I don't require your graduation thesis to 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". The entire academic community can have a certain influence.”

"You've done it once, and I believe you can do it again."

"Usually, I won't interfere with your research. You can do whatever you want, and of course you can do projects with me."

"For now, if you don't have any ideas about the research direction, I suggest you come to my side first."

"Although the problems you have studied before have some overlap with the cutting-edge research fields of theoretical physics, the overlap is not much, 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 to study faster."

"It depends on how you choose."

"If you need funds, you can also tell me. I can provide a certain amount of funds every year according to the topics you want to do."

"That's about all there is to say, and you 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 is very clear about the training method, and he can't force him to do something.

Otherwise, it will only affect the display of his talent.

Li Mu thought for a moment, and then asked, "Academician Yue, what project are you working on now?"

Yue Lang smiled, then directly pulled a document from the side and handed it to Li Mu.

"This is it."

After Li Mu took this document, he saw that it said: [Verification of the Existence of Zcs State Containing Strange Quark and Charm Tetraquark State].

"Do you know what this is?"

Yue Lang asked with a smile, obviously thinking of testing.

But for Li Mu's knowledge reserve, this is very simple.

"According to the Standard Model of particle physics, in addition to the 'conventional' hadrons, which are mesons made of two quarks, or baryons made of three quarks, there could be four or five quarks, and the 'exotic' hadrons made of pure gluons."

"So this Zcs should belong to one of them."

"Equivalent to looking for a new kind of particle?"

Li Mu raised his head and looked at Yue Lang.

Yue Lang laughed, then nodded slightly: "That's very good, that's it."

"Theoretical physics cannot do without quantum theory, and quantum theory cannot do without these elementary particles."

"So the discovery of new particles has become a hot topic that our theoretical physics is most committed to researching."

"Of course, speaking from a utilitarian point of view, as long as such a new particle is discovered, you can publish an article on nature or science."

"But in our academic world, it's better to be utilitarian."

Yue Lang smiled and continued: "This tetraquark particle is also 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 expert like you."

Li Mu nodded, and then he couldn't help asking curiously: "Where do we get the experimental data from? It's impossible for Shanghai Jiaotong University to have such a particle collider, right?"

Yue Lang waved his hands helplessly: "Of course it's impossible, if there is, I can wake up laughing from my dreams."

"Our project relies on the Shanghai Institute of High Energy Physics and analyzes the experimental data of the Shangjing Spectrometer III."

Li Mu nodded, expressing his understanding.

Shangjing Spectrometer III is a large-scale general-purpose magnetic spectrometer on the Shangjing Electron Positron Collider, which 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.

At present, there is no equipment that can help scientists directly observe this microscopic phenomenon.

Therefore, the most basic research method is based on 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 from them.

"How? Do you want to come and study this project with me?"

Li Mu pondered for a moment, then said: "Since you have suggested so, then I will try it first."

"good."

Yue Lang nodded, and then brought another stack of materials from the side. \b

"The information here is all related data, which contains the results of hundreds of thousands of collisions. I guess, if you can find it, you should be able to find it from these data."

"You can take a look first, and just ask me if you don't understand anything."

Li Mu took these materials, and the different types of materials inside have been separated with clips.

"This stack is the time-of-flight statistics, which measure the flight time of charged particles; this one is the statistical results of the shower counter, which records the energy of various particles."

"Then there is also the record position, beam brightness..."

Yue Lang taught Li Mu to understand these data hand in hand, and also told him the function 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 closely for a while, his brows could not help but frown.

"How do you feel that the data here... is a bit complicated? There are quite a few data that exceed the margin of error by several times."

Yue Lang smiled, with some helplessness on his face: "There is no way, our domestic particle colliders are like this, and there is still a certain gap between the advanced level and the top foreign colliders. , will always be disturbed by all kinds of noise.”

"You should also be able to imagine that in this kind of experiment process, noise is always inevitable, even the earth's magnetic field, gravity, plus ubiquitous electromagnetic interference, etc., will affect the accuracy of the measurement Therefore, why those of us who study high-energy physics dream of building a collider on the moon is because we can greatly get rid of this effect.”

"All right."

Li Mu had no choice but to accept this reality.

Also have to sigh with emotion.

Even if the research is theoretical physics, it still depends on experiments.

Just like Yang Zhenning and Li Zhengdao back then, after proposing the law of non-conservation of parity, the physics community couldn’t believe it, because it overturned the law of parity conservation that the physics community has always insisted on, so their papers were published together. It was not recognized at first.

It wasn't until later in another physicist Wu Jianxiong's well-designed experiment that the law of parity non-conservation was verified, and they won the Nobel Prize in Physics.

In this way, experimental physics and theoretical physics complement each other and coexist closely.

Afterwards, Li Mu continued to read, and it was rare for Yue Lang not to be busy with his own affairs, he waited quietly by the side, and occasionally went to the laboratory to ask his students how they were doing recently.

Time passed quickly, from noon to afternoon, Li Mu stayed in Yue Lang's office, looking at these 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 also relieved and moved.

Being able to look at these boring data for so long, it is no wonder that Li Mu can make such great achievements.

Afterwards, he greeted Li Mu: "Okay, let's go eat first, don't have to work too hard."

But Li Mu said at this time: "Go and eat first, I have some ideas about these data now."

"Huh? What do you think?" Yue Lang was taken aback for a moment.

Although it took a long time to watch it all afternoon, but what can you think about it?

Li Mu took the paper and pen from the side: "Reduce the noise of these data."

Yue Lang: "???"

It is indeed a common method to use mathematical methods to denoise experimental data, and it has always been the direction that researchers of major particle colliders have tried.

However, unlike Li Mu’s noise reduction method, their noise reduction generally determines the algorithm, and then writes it into the computer of the monitoring and statistics equipment, and then directly completes the noise reduction during the data collection process of these devices, so that It can also ensure that the real data in the particle collision process will not be affected.

However, Li Mu's method of directly starting from the obtained experimental data is likely to affect the real data. In the end, not only will the noise reduction not be achieved, but even the authenticity of the data will be affected.

This can no longer be called noise reduction, but "repair".

It's like restoring the low-quality movies of the last century to make them high-quality, which is very troublesome, and a careless one may cause the original picture to be distorted.

What's more, Li Mu has only watched it for how long, can he really do it?

Yue Lang couldn't help but have such doubts in his heart.

However, since Li Mu dared to do this, it showed that he was sure.

In fact, since he got this data, the computer in his mind has been thinking about it.

And with the help of the brain computer, it is far easier to do this than Yue Lang imagined.

In just a moment, Li Mu completed the restoration of the first collision energy data.

And this repaired data suddenly returned to within one time of the error range of the confidence interval!

Yue Lang next to him was shocked.

Just relying on this method of noise reduction, Li Mu can be invited by various high-energy physics research units all over the world!

even……

If this method is systematically summarized into a paper and published, maybe it will directly meet the graduation requirements he told Li Mu at noon?

Graduating on the first day of entry?

...

[Going out to do errands two days ago, it may be sunny today, and I'm a little depressed. I'm only 8k words today, and I'll continue after adding more]