Chapter 465

"Wait a minute, Lena. I have a question here."

At this time, Lanchester stannian suddenly spoke.

"There will be time dilation effect on an object moving at a speed close to the speed of light. According to the relativity principle of motion, the external observer is also theoretically using the speed of light principle. Will the external observer also have time dilation effect?"

Mr. stanian's words silenced the conference room again, and his questions seemed to contain something strange that was difficult to explain.

"as like as two peas, Al and beta, they grew up at the same time, and at the same time, Al got a spell that enabled him to move away from the stars at the speed of light and to the universe. He experienced a brief acceleration, and flew at the speed of light, and slowed down immediately after flying for a while, then returned at the speed of light." "the two"

Sir stanyon spoke as he weighed his words.

"According to the time expansion theory, Al is in the high-speed movement close to the speed of light, he should have a time expansion effect. The beta on the ground should have passed several seconds in one second. If we don't discuss the precise calculation, the time of departure, Al and beta are both 20 years old, and the time of return, due to the time expansion effect, ah You look like you're only thirty, but beta is seventy

After hearing the explanation of stanian, several high-level mages in the audience pondered for a moment and nodded slightly to agree with such a hypothesis.

"But now, let's think from a different angle. If we take Al as the reference frame, beta has actually experienced the process of accelerating to the speed of light and then turning back. Beta should also have the time expansion effect. From Al's point of view, beta should be younger than itself."

"It's a contradiction!"

Ludwig Stein quickly realized the problem that, due to the relativity of motion, the time expansion effect should appear on both sides, rather than just one side of the time.

"Lena, how do you explain this?"

Eagles field is also puzzled. Mr. stanian's paradox is quite easy to understand, but difficult to explain, because it seems to conflict with the time inflation effect. Now, no one can confidently say which one is wrong.

People's attention fell on Lena, because among all the high-level mages present, only Lena, the proposer of the theory of relativity, knows this theory best, and he can't have failed to consider this problem.

Lena looked around, cleared her throat, and stood up.

"This problem is really under my consideration, sir. To be honest, the twin paradox is caused by the difference between the classical space-time system and the relativistic space-time system."

With a wave of his hand, two little clocks appeared in mid air.

"We can simplify the problem as two identical clocks, one of which suddenly turns back at a speed close to the speed of light, and the other stays in place. We can find out what will happen to the display time of the two clocks after turning back. In order to continue the simplification, we assume that the process of acceleration and deceleration almost does not exist. This is the result of two stages of uniform motion, which is the result of the motion That clock is called a moving clock, and a stationary clock is called a stationary clock. "

Under the gaze of the mages, Lena made the light spot repeat the movement.

"In the classical physics system, taking two light points as the reference frame, we can naturally get the result that each other is moving at a constant speed relative to itself. But let's focus on the moving clock, that is, the moving clock. The process of moving clock away from the static clock is very obvious. Taking the static clock as the reference, the moving clock has time expansion, and the time passes more slowly, while the moving clock is the most important For reference, the static clock is also moving at a constant speed, with time expanding and time passing more slowly. "

"Isn't that contradiction?"

Asked Madame Maria instein, puzzled.

"But in fact, Mr. Enstein, the time of the moving clock and the static clock are relative. They do not feel the difference of time passing. Just as we do not feel that time passes faster or slower in the ruins, only when they meet each other can their comparison of time be meaningful."

After explaining this, Lena began to turn the distant light back.

"The problem lies in the process of turning back. From the perspective of the static clock, the moving clock is also moving at a constant speed, but from the perspective of the driven clock, the static clock moves from its rear to its front in an instant, which is similar to a 180 degree semicircle movement, and this movement is beyond the speed of light."

"Beyond the speed of light?"

Gloria Augustine pondered silently. It seems that Lena's words are full of contradictions, but there are some facts he didn't say clearly.

"Of course, this behavior beyond the speed of light has no transmission of any information. In other words, if the moving clock can see things at an infinite distance, it can't see the existence of the static clock in front of it at the moment of turning. To be exact, although the static clock exists, it is not in the light cone of the moving clock at the moment."

Lainer's words caused waves, which was a situation never imagined by high-level mages. Compared with the scale effect and time expansion effect, the phenomenon lainer said was more incredible."We define the trajectory of a particle in space-time as its world line. The world line records all the positions of the particle from the past to the future. The range of this position is called the light cone. The range of the light cone is determined by the speed of light. An object cannot exceed the speed of light. Only things within the light cone will have an impact on the object."

Lena proposed a concept, at the same time in midair, a light point in the coordinate axis zigzag forward, forming a cone.

"As for the moving clock, in the process of moving away, it will observe that the time of the static clock slows down. At the moment of turning around, the time of the static clock suddenly accelerates. In the process of returning, the time of the static clock continues to slow down until the two sides meet. At this time, the time of the moving clock is still less than the time of the static clock. That is to say, Al, who flew into the sky, finally met It's going to be younger than beta. "

After that, Lena demonstrated the phenomenon represented by his words. He described two lines in a coordinate axis, one coincides with the vertical axis, the other is a diagonal line, and there are two hyperbolas on the coordinate axis. The horizontal axis of the coordinate axis represents space X, and the vertical axis is the CT of time multiplied by the speed of light.

"The fundamental reason for this phenomenon is that the moving clock and the stationary clock are in different world lines. In this coordinate system, the moving clock represents a diagonal line, while the stationary clock is a straight line. Clocks in different world lines cannot be equivalent through simple coordinate system transformation."

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