After returning from Professor Liang Zhiyuan, Zhou Chen returned to the dormitory and started another round of calculations, and what he needed to do now was to supplement the thesis!

His thesis is close to perfection, but in reality it is still not perfect. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

The equation that Liang Zhiyuan handed him was like a key to open the door to a new world, allowing him to realize something that he had forgotten but was extremely important.

As mentioned earlier, a Kerr black hole has two event horizons, and as its rotational speed increases, the angular momentum increases, and the position r+ of the outer horizon and the position r- of the inner horizon will continue to get closer, and the unidirectional membrane region will become thinner.

When the angular momentum is increased to such that the square of a (angular momentum per unit mass) is equal to the square of the field source mass M, r+ is equal to r- is equal to the black hole field source mass M, and the one-way membrane becomes a thin film, and the Kerr black hole becomes an extreme Kerr black hole.

If the rotational speed is increased at this time and additional angular momentum is given, the square of the angular momentum a per unit mass will be greater than the square of the field source mass M, which is not allowed by the "cosmic supervision".

Zhou Chen has used mathematical means to prove that the "cosmic supervision hypothesis" is the third law of black holes, that is, the real core is the critical value of "r+=r-=M", and increasing the angular momentum can reach the condition of "a^2=M^2", so that "r+=r-=M" is true. If it exceeds one point, it will cross the critical value and the strange ring will be exposed!

So can other behaviors reach this threshold?

In fact, there are other conditions that can be met, and there is more than one!

In another black hole (R-N black hole), its event horizon r+ and r- are determined by the total mass and total charge, so increasing its charge can reach the condition of "Q^2=M^2", so that "r+=r-=M" is established, beyond one point, the critical value is crossed, and the odd ring is exposed!

In other words, there is a limit to the total charge of such extreme black holes.

There is also a kind of black hole, which is a combination of these two black holes, which is the equation "a^2+Q^2=M^2" given to him by Liang Zhiyuan, at this time, the event horizon r+ and r- are determined by the total mass, total charge, and angular velocity.

The formation of a mature theory is inevitably a process of constant unification and expansion. It will encounter special situations one after another, and what theorists have to do is to incorporate these special situations, and finally form a unified description that can reflect various situations, which is a mature theory.

With previous derivation experience, the derivation of the remaining two types of black holes becomes very simple.

It didn't take much time for Zhou Chen to complete the derivation of three black holes: Kerr black hole, R-N black hole and Kerr-Newman black hole, and finally formed a unified formula.

It's just that when he saw the formula, Zhou Chen was completely speechless. If the surface gravitational expression of extreme Kerr black holes can be described as cumbersome, then the general expression of the combination of the three is more like a monster, which seems so unfriendly.

Although it fits perfectly into the subsequent calculations, it is not beautiful if it is not beautiful, and there is no room for justification.

"Dandan, do you think this formula can be further optimized?"

After looking at this expression for a long time, he felt very awkward, and Zhou Chen called for a laydown in his heart, hoping that it could give a solution.

The projection of Dan Dan appeared on the table, and I saw it slowly glance at the expression, and quickly gave an answer.

"The reason why this formula looks so ugly is related to the mathematical system architecture of the earth's civilization, and if you want to simplify it, you must reconstruct the mathematical system and introduce new mathematical rules."

Dandan's answer made Zhou Chen stunned for a moment, but he also understood what Dandan's expression meant.

Due to the limitations of the current mathematical framework, we always rely on the original basis when deriving some unknown models, which leads to the subsequent results becoming more and more complex.

For example, it is very easy to ask a primary school student to do a primary school problem, and four mixed operations and a simple introduction of unknowns can be solved, but if a primary school student is asked to do a high school problem or a college problem, not to mention whether he can do it, even if he can, use the mathematical tools he originally mastered to solve it, the whole process must be very cumbersome.

After all, formulas and theorems are actually simplifications that human beings have obtained in the process of discovery, such as useful tools such as calculus, which can often turn decay into magic and solve the original unsolvable problems at once.

So at the end of the day, it's a matter of mathematical architecture.

But when it comes to mathematical architecture, it's not a trivial issue. At least with Zhou Chen's current strength, it is difficult to solve.

"Forget it, if it's complicated, it's complicated."

Although the expression looks awkward, you can get a good result after the operation, so instead of spending more energy to beautify it, let's use it first.

Zhou Chen quickly gave up the idea of "reconstructing the mathematical system" and was ready to save this matter for later to find a way to solve it.

"By the way, how are the Earth's fleet repairs going?"

Speaking of serious things, there is nothing more worrying about Zhou Chen than the progress of the maintenance of the Earth Fleet. Although he has been busy revising his thesis these days, the progress of the maintenance of the Earth fleet is something that he has to keep track of every day as a commander.

The Earth Fleet is the foundation of his life, and there is no room for slackness.

"The maintenance of the flagship 'Lanqiong' has completed 85% of the overall progress, basically restoring the main functions of the hull, and the 'Meteorite' and 'Poseidon' have completed 73% and 64% respectively, and have also restored some functions, and the remaining ships are more seriously damaged, and the maintenance priority is also ranked after the 'Lanqiong', 'Meteorite' and 'Poseidon', and it is expected that it will take 75 Earth days." Dandan replied.

Zhou Chen nodded to show that he understood, and had no objection to Dandan's arrangement.

As the largest, most important, and most complete of the three ships, the maintenance of the Lanqiong, the Meteorite, and the Poseidon is naturally extremely important.

Although I can't wait to repair all the fleets right away, I can't do this with realistic capabilities, and I have to eat the meal in one bite, and the foundation has to be laid down little by little.

"Let's do our best to repair it as planned." With a wave of his hand, he gave an order that hadn't changed in days.

"Commander, I have good news for you, according to the information that the probe has just sent back from the orbit of Jupiter, our repair progress is expected to be advanced." Dan Dan suddenly squinted his eyes very realistically, and said with a thief in his face.

"Oh? What is the situation? ”

Zhou Chen immediately came to his senses.

"The Exploration 1561 probe, which is traveling near Jupiter, made a major discovery when it scanned the Trojan Group asteroids and discovered a special planet."

"The planet is 167 kilometers long and 116 kilometers wide, and after depth element detection, it was found that the surface of the planet is attached to a rocky layer about 34 kilometers thick, but its interior contains a large amount of iron, aluminum, zinc, copper, magnesium and other metal elements, the total amount is expected to exceed 60 billion tons."

60 billion tons!

Hearing this, Zhou Chen's eyes lit up suddenly.

What is the concept of a planet with metal reserves of 60 billion tons? Proper ready-made materials!

Since becoming the commander of the Earth Fleet, Zhou Chen has truly understood one thing. That is, raising a huge fleet is no different from raising a gold-devouring beast! This feeling is especially strong when the fleet is damaged and needs to be replenished with metal.

In order to find the resources needed to repair the Earth fleet faster, he sent countless probes to all directions of the solar system, and the area around Jupiter was specially taken care of as the location of the future fleet.

In the past few days, there have been news from probes one after another, but this is the first time that such a huge "metal planet" has been discovered like today.