I really don't want to lie down and win

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"You can call me Xiao Xu." Xu Mang said with a smile: "Can you let me see your calculation process? I like the universe... I am a lover of space, so I chose physics." Department, majoring in theoretical physics."

"???"

"???"

"???"

Can't see it!

This guy is actually engaged in physics, or in theoretical physics!

and many more,

Isn't this just right?

"Xiao Xu?"

"Unexpectedly, you still study theoretical physics, so you should understand the theory of relativity?" Tong Min asked.

"Okay."

"Let me take a look first?" Xu Mang was really curious about the content of their calculations. If these four people's calculations fail, they will not be able to solve the problem of oxygen fugacity in exoplanets. The problem of oxygen fugacity in exoplanets requires a lot of comparisons. Calculated, the intensity is high.

"Give!"

That Liu Yan generously handed over all the manuscripts to Xu Mang, but Lu Bo was a little dissatisfied with this. For such an important thing, he gave it as he said. No matter what, it was all his own knowledge. It's too childish.

But it was too late for him to refuse, Xu Mang was reading their calculations.

at first,

They thought it was just a calculation problem, but it turned out that there was not only a problem with the calculation, but also a problem with the whole direction of thinking. Take the functional relationship between the ability, momentum and time of the expanding universe that they needed to solve, they used the wrong formula!

Xu Mang returned the manuscript to them in disappointment, and said calmly, "You... used the wrong formula."

"This problem needs to use the Robertson Waker metric to describe space-time." Xu Mang said helplessly: "Get the non-zero components from the formula, then use the geodesic equation to calculate, and finally get the thinking momentum and basic momentum, including energy. "

words fell,

The few people present were surprised and looked at Xu Mang in disbelief.

"you..."

"You figured it out so quickly?" Tong Min asked in horror, "Just... just glanced at our calculation process?"

"Yup!"

"Actually, this question is quite simple." Xu Mang said with a smile: "After all, I am studying theoretical physics. Relativity and quantum mechanics are my majors. It is not difficult to get the result."

"Give!"

Xu Mang handed over the manuscript to the girl Liu Yan.

wrong!

This is not the case!

This theory of relativity is actually not the same as relativistic cosmology. If this guy is purely engaged in theoretical physics, it is impossible for him to come into contact with such profound issues, including the Robertson Waker metric. How does he know this?

Looking at the back of Xu Mang's departure, the two international students of astrophysics looked confused. They felt that they had seen a monster.

"he..."

"It's different!"

"It's not like an ordinary college student." Liu Yan said seriously: "To analyze the cause of the problem in such a short period of time is definitely not something that ordinary students can do. Have you ever seen such a person?"

Tong Min and Lu Bo shook their heads.

"never mind..."

"Maybe it's luck." Tong Min smiled wryly: "Then... the second question the professor set for us, assume that the early universe was composed of non-interacting particles and gases with zero mass, which are only affected by gravity. ..”

at this time,

Xu Mang walked to Xiaoman's side with a disappointed expression on his face, and sat on the chair silently without saying a word.

"Ugh?"

"What's the matter?" Yang Xiaoman asked with concern: "I was still in high spirits, why suddenly...been wilting?"

"Ugh..."

"I originally wanted these four people to help me solve the problem of oxygen fugacity outside the system, but these people's abilities are not good enough." Xu Mang said helplessly: "The computing ability is urgent, and there are also problems with professional ability, of course. ..limited to those two boys."

"Those two girls don't count?" Yang Xiaoman rolled her eyes and said hastily, "I want to eat corn... put a little hoisin sauce on it."

"Oh..."

Xu Mang obediently ran to the barbecue stove and grilled corn for Her Lady Queen.

at this time,

The four of them are solving the temperature dependence time of heat balance in the hypothetical universe, and the professors of Tong Min and Lu Bo need to let the two of them calculate the dependence.

Confused...

Completely confused!

Fortunately, the four people successfully calculated the number of photons whose frequency is between v and vdv in the volume Vt according to Planck's black body radiation theory at time t when the photon gas is in thermal equilibrium.

but...

Because the frequency will move, the volume will expand, and how to calculate this process is basically difficult for the four people present.

"It's over..."

"This has completely entered the stage of confusion." Tong Min said helplessly: "I found that this professor is deliberately messing with us... This question is too sharp."

"I think so..."

"This calculation is quite a lot. To be honest... I am a graduate student in the Department of Mathematics, but... I can't calculate it." Liu Yan smiled wryly: "Oh... I mean, do you two usually offend you? Professor, probably embarrassing you?"

"Don't bullshit!"

"We are usually very honest. I think...that bastard professor deliberately played tricks. I said...why did we call the two of us to the office alone at that time? That's the reason!" Tong Min said angrily: "This is intentional to prevent us from graduating!"

"impossible?"