Meet the principal

It takes a genius to remember the address of this website in one second: (Vertex Chinese), the fastest update! No ads!? "General Relativity..."

Mr. Braggs gently read the name of this theory and felt that there was some attractive power in it.

"In addition to some conclusions of the special theory of relativity, the general theory of relativity also extends two principles."

Reiner explained further.

"The first is the equivalence principle, that is, the dynamic effects of the inertial force field and the gravitational field are locally indistinguishable, because under the framework of general relativity, gravity is not a force in the traditional sense, but is caused by mass. The interaction caused by the distortion of space and time, and the equivalence principle brings gravity back to the original scope of discussion. Under certain limited conditions, gravity can still be discussed as a fundamental force."

The equivalence principle is actually a bridge connecting classical magic and the magic system under the framework of relativity. Just like Alberton's mechanics is similar to quantum mechanics at macroscopic low speeds, this principle regularizes the law of universal gravitation proposed by Sir Alberton. We focus on general situations and discuss special cases separately.

"The second is the general principle of relativity, which means that all physical laws take the same form in any reference system. Compared with the previous special principle of relativity, the general principle of relativity expands it from the inertial frame to all reference systems. system, which is also an indispensable cornerstone for mages to pursue the truth."

After redefining gravity, the principle of special relativity can naturally be expanded into the principle of general relativity. The meaning of this principle is the formula derived by the mages. The form of the determined theorem is unified in any reference system. In other words In other words, there is truth in this world, and the theory will not be different due to different reference systems.

After explaining the two basic principles of general relativity, Reiner glanced at the Netherworld Gate not far away.

"The phenomenon of gravity and space-time distortion reminds me of goldfish in a fish tank. If goldfish also had human-like intelligence, they would see a distorted view of the outside world through a spherical fish tank, but for those who have been living in it since childhood, This is normal for a goldfish grown in a fish tank."

He paused, then spoke.

"If a goldfish is lucky enough to leave the fish tank without dying, it will see the 'normal' world, which is contrary to its original knowledge, but this is the real world, and the reason why its previous knowledge is The deviation occurred because of the existence of the fish tank.”

Reiner's words caused the mages to fall into deep thought. Now it seems that the fish tank is obviously a gravitational field, which is the distortion of space and time caused by massive objects.

In the distortion of space and time, the path of light will change, so the measured speed of light will also be different, and the speed of light, under the framework of the theory of relativity, is a constant in the universe.

In other words, even the constants of this universe may not be fixed. No one knows whether there is a black hole in the galaxy where this planet is located, and the space-time distortion it brings changes the speed of light.

When people laugh at the goldfish in the fish tank, can they imagine that they might be in a bigger fish tank?

But the general theory of relativity tells the wizards that even if the constants are different, the physical laws are the same form in any reference system. At least the laws mastered by the wizards are universal.

The significance of this is extraordinary.

This means that although the mages are physically restrained in the fish tank, their minds have touched the complex and chaotic world outside. This is a victory for the mind.

The two legendary mages felt a little emotional. It was this kind of truth that they had been pursuing all their lives. At this moment, it was proposed by a young mage. While they were relieved, they were also a little regretful.

After Reiner concluded the general theory of relativity, he also had some mixed feelings.

It was only after he mastered powerful magic and reached the pinnacle of personal strength in this world that he actually observed the phenomenon of light bending and even came into contact with the black hole-like gate of the netherworld based on traceable ideas.

The general theory of relativity of this world was obtained through derivation.

But in another world, a young man could sit at his desk and gain insight into the truth of the universe just through calculations with pen and paper.

What wisdom this is.

After thinking for a moment, Reiner continued.

"Based on the phenomena we have observed now, the original theory of relativity did not take into account the problem of gravity and was flawed. Therefore, it was revised. In the general theory of relativity, we can predict that when the mass of an object is concentrated at a certain point, its The surrounding space-time distortion will become so strong that even light cannot escape. I call this point a singularity, and I call this area a black hole."

Reiner's conclusion is based on reasonable inference supported by general relativity. It is an extreme situation and a prediction.

"Black hole..."

Lord Alberton also thought of the Nether Gate not far from the Abyss Submarine. However, compared to the dark black hole that Reiner mentioned that even light cannot escape, the distortion in front of him does not seem to have such a strong gravitational pull. .

"Wait a minute, Reiner, if even light can't escape from a black hole, then we won't be able to observe such a celestial body at all."

Field thought that people's observation of celestial bodies is essentially the observation of the light they emit. Even those stars that do not emit light can be found through spectral analysis, but black holes cannot escape any light. In the framework of the theory of relativity, Among them, that is, no information can be transmitted from the black hole, and people have no way to detect this special celestial body.

"It is true that we cannot observe black holes using conventional means, but under the huge gravity, the surrounding celestial bodies will inevitably have different motion conditions, just like the bumpy road will inevitably affect the movement of the carriage. By running it, we can measure the existence and location of black holes through similar situations."

Reiner nodded and continued.

"For example, since a massive object can generate a strong gravitational field, causing light to bend, then we can see through this massive object other celestial bodies that are obscured by it."

A projection of light appeared on his hand. It was a system composed of several celestial bodies. It can be seen that although the light emitted from distant stars would be obscured by the celestial bodies in the middle according to common sense, due to the strong gravitational field, the light appeared. By bending, you can see the light of distant stars. In this way, this massive celestial body is like a lens, reflecting the things behind it.

"This is the gravitational lensing effect."

Reiner said that the moment he mentioned this phenomenon, everyone present immediately thought of an object with a similar feeling.

That is the Netherworld Gate.