Vol 6 Chapter 44: Go to

In the study of the central tower, Ace wrote slowly.
"...It can be seen that gravity and acceleration are the same thing. A person doing free fall cannot feel his own weight because a new gravitational field appears in his acceleration system at the same time. This gravitational field and acceleration system Cancel each other out.
From this we can deduce our first axiom, the principle of equivalence.
The dynamic effects of inertial force field and gravitational field are locally indistinguishable.
Now, let’s discuss the problem just now. If we try to define the inertial system, we will fall into an infinite loop. The principle of equivalence cannot solve this problem. Then we can expand this concept to eliminate the inertial system and replace it with all reference systems, no matter Is it inertial or non-inertial.
This is the principle of general relativity. All coordinate systems (including non-inertial systems) are equal, that is, objective and true physical laws, which should be valid in any coordinate system. For this reason, the laws of physics should be covariant under arbitrary coordinate transformation, so the generalized relativity principle is also called the generalized covariance principle.
Generalized covariance can only obtain physical content through the principle of equivalence. "
After that, Ace began to write a series of mathematical derivations and covariant equations, which will not be repeated here.
"Let's do another thinking experiment. The enclosed elevator is moving upwards at an accelerated rate. A beam of light enters from a small hole on one side. What is the distance between the light and the floor when it reaches the opposite side?
According to the principle of equivalence, we can deduce that the distance between the light point on the other side and the floor must be slightly smaller than that on the beginning.
This is because the gravitational field bends the light, in other words, the light will bend when it passes through the gravitational field.
So we need to discuss why light bends. "
The power of Da Yuan was surging crazily, and it seemed that Ace had raised an incredible question. Even in the man-made half-plane, Yuan Li had flowed into this world along the magic net and surrounded Ace.
As the second landlord at the current stage inside the world, Ace has great authority. He eliminates Yuanli's vision, retaining only pure Yuanli, and continues to write.
"Our cognitive geometry tells us that the straight line between two points is the shortest. If a person wants to go from A to B, the straight line is the least laborious.
However, if someone wants to fly from Yeguang City to Bairn City in the Old World, the shortest distance is not a straight line, but an arc formed around the surface of the center of the earth.
This arc is also called a geodesic.
The geodesic is derived from geocentric measurement and represents the shortest path between two points.
Then, the bending of light is also determined by a certain geodesic-like structure in the gravitational field.
In other words, the gravitational field changes the space-time, making the flat space-time curved.
We need to establish a new space-time equation and find the law of space-time bending. "
Ace stopped Bi, time and space seemed to be shaking, Da Yuan was in joy, Da Yuan who had just been pressed boiled eagerly again, like a prelude to a musical climax, one wave after another.
In the galaxy universe inside the dream star, a group of wizards have arrived at the magic temple, stepping on the cold silver star sand floor, Thales could not help but shudder, melodious and empty music sounded, everyone present felt the throbbing of the soul .
"Master Ace made this singing, every time I came in, I felt my whole body tremble."
A legendary wizard whispered to his companion.
"There are a lot of specialties in this. The music of the Magic Temple is different to everyone's ears. This is a piece of music from the music field. It hits your heart. The performer is the music dream among the three thousand dream gods."
Another epic wizard seemed to know a lot, and said with a smile.
"Quiet, this is the temple of magic. It contains the subconscious minds of all wizards. We are about to go to the sea of ​​consciousness in the temple. You must keep your mind steady. Once you are fascinated by the sea of ​​consciousness, you will be assimilated, and no one will be saved. I can't stop you."
Bayern sternly interrupted everyone's whispers and solemnly warned.
Legend has it that wizards and epic wizards did not dare to speak immediately, and the wizard who came for the first time was even more anxious.
Betty coughed softly, and said gently to the wizards: "Your Excellency Bayern is right. The wizard subconscious sea is indeed dangerous. Of course, there are souls at level three and above that are stable. As long as you don't think about it, there will be no major problems. .
Don't try to feel the sea of ​​consciousness. If you become a mythical wizard, you can come here to feel and indulge at any time. "
"Master Betty is so gentle, I really like her."
A new legendary female wizard said in drunkenness.
"..."
Another wizard wanted to speak, he hesitated for a long time, and recalled seeing Betty as a steel giant and easily defeated three devil monarchs with a powerful electromagnetic railgun and small tactical nuclear fission spells. He shuddered, nothing. Did not say.
Bayern bowed slightly to the statue of Ace, and then chanted the spell solemnly with magic words. The gurgling water sounded, and the gurgling water began to appear in the hall, more and more, and finally turned into turbulent waves. Rolled, feeling the sky spinning, when I was sober, I found that I had left the hall and came into an ocean.
The sea here is extremely clear and cheerful, and the wizards followed Bayern and swam slowly in the sea.
A bright light floated by, and a legendary wizard was in the middle. He instantly stiffened, as if sinking into a dream, and as if reincarnation.
It seems that he has become a commoner, living in a cold city, being bullied from time to time, and it was not until one day that he obtained a magic book that he changed his fate.
He used the secondary spells he learned to tease those who insulted him, and gradually became rich ~EbookFREE.me~ But the good times didn't last long, and the city seemed to find that the devils were arrested everywhere.
While he was panicking, the fire spreader appeared and led them away on the eve of the destruction of the city, climbing over the snow-capped mountains and over the ice field.
Built a new city, a magical city.
Master Ace uttered the strongest voice of the times, "Thinking wizards are the measure of everything."
He worked hard to follow, eager to witness the future of magic, the beautiful future described by Master Ace.
But he fell, died at night when a large number of monsters attacked the city, and never woke up again.
The legendary wizard suddenly woke up at this moment, tears blurred his eyes, and muttered: "The future you want to see has arrived. Now is the age of magic, the age of wizards, the magic net dominates the inside of the world, we wizards It can capture hostile gods, put them in a long sleep, and develop a great floating city magic civilization. This is the era of magic and prosperity."
A feeling of comfort and regret was surging, and the colorful light surrounding the legendary wizard turned into a mark, submerged in the back of his left hand.