Chapter 518

"General relativity..."

Your Excellency Bragg read the name of this theory gently and felt that there was some attractive power in it.

"Apart from some conclusions of special relativity, general relativity extends two principles."

Reiner added.

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

In fact, the principle of equivalence is a bridge connecting the classical magic and the magic system under the framework of relativity, just as Alberton's mechanics is similar to quantum mechanics in the case of macro low speed. This principle regularizes the law of universal gravitation proposed by Mr. Alberton in the general case, and discusses the special case separately.

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

After the redefinition of gravity, the principle of relativity in the narrow sense can naturally be expanded into the principle of relativity in the broad sense. The meaning of this principle is the formula deduced by the mages. The form of the determined theorem in any reference system is unified. In other words, there is truth in this world, and there will not be different theories because of different reference systems.

Having said these two basic principles of general relativity, Lehner took a look at the gate of the nether world not far away.

"The phenomenon of gravity and space-time distortion reminds me of the goldfish in the aquarium. If goldfish also have the common wisdom of human beings, they can see the distorted scene of the external world through the spherical aquarium. But for goldfish who grew up in the aquarium, this is normal."

He said after a pause.

"If a goldfish is lucky enough to leave the aquarium and not die, it will see the" normal "world, which is contrary to its original cognition, but this is the real world. The reason why its previous cognition deviates is because of the existence of the aquarium."

Lena's words made the mages deep in thought. Now, this fish tank is obviously a gravitational field, which is the distortion of space-time caused by a mass object.

In the distortion of space-time, the path of light will change, and the calculated speed of light is also different. Under the framework of relativity, the speed of light is a constant of the universe.

In other words, even the constant of the universe may not be fixed. No one knows whether there is a black hole in the galaxy where the planet is located. The space-time distortion caused by the black hole changes the speed of light.

When people laugh at the goldfish in the aquarium, can they think that they may be in a bigger aquarium?

But general relativity tells the mages that even if the constants are different, the laws of physics are the same form in any reference frame. At least the laws mastered by the mages are universal.

The significance of this is extraordinary.

This means that although the mages' bodies are bound in the fish tank, their thinking has already touched the complicated and chaotic world outside, which is the victory of their thinking.

The two legendary mages have some feelings. What they have been pursuing all their lives is such a truth. At this moment, it is proposed by a young mage, which makes them feel gratified and regret at the same time.

After he summed up general relativity, he had mixed feelings.

It was only after he had mastered the powerful magic and reached the peak of his personal strength in the world that he actually observed the phenomenon of light bending under the thought of having traces to follow, and even came into contact with the gate of the nether world, which is like a black hole, that he deduced the general relativity of the world.

But in another world, a young man can sit in front of his desk and get insight into the truth of the universe just by calculating with pen and paper.

What wisdom it is.

Thinking for a moment, Lena continued.

"According to the phenomenon we have observed now, the original theory of relativity has not considered the problem of gravity, so it has been revised. In the general theory of relativity, we can predict that when the mass of an object is concentrated on a certain point, the distortion of space-time around it will become extremely strong, so that even light can not escape. This point I call strange Point, and this area, I call a black hole. "

Lena's conclusion is based on the reasonable inference supported by general relativity, which is an extreme situation and a prediction.

"Black hole..."

Sir Alberton also thought of the dark gate not far from the deep Voyager, but compared with the dark black hole in Lena's mouth, which even light can't escape, the twist in front of him doesn't seem to have so much gravity.

"Wait, Lena, if even light can't escape from the black hole, then we can't see this kind of object at all."Field thought that people's observation of celestial bodies is essentially the observation of the light emitted by them. Even those stars that don't emit light can be found by spectral analysis, but black holes can't escape any light. In the framework of relativity, that is, no information can be transmitted from black holes, so people can't explore this special celestial body at all.

"It's true that we can't observe the black hole with conventional means at all, but under the huge gravity, the surrounding celestial bodies will inevitably have different motion conditions, just as the potholes on the road will affect the operation of the carriage. We can measure the existence and location of the black hole through similar conditions."

Lena nodded and continued.

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

He has a projection of light on hand, which is a system composed of several celestial bodies. It can be seen that although the light emitted from a distant star is normally covered by the celestial body in the middle, due to the strong gravitational field, the light is bent, and the light of a distant star can be seen. In this way, the massive celestial body is like a lens, reflecting the light It shows what's behind you.

"This is the gravitational lensing effect."

In the moment he spoke about this phenomenon, all the people in the room immediately thought of an object with a similar feeling.

That's the gate of the nether world.

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