Bringing the Supermarket to the Apocalypse Chapter 520:

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A pair of twins a and b, a is on the earth, b is taking a rocket to make an interstellar trip, and after a long time returns to the earth.

Einstein asserted from the theory of relativity that the two experienced different times and that b will be younger than a when they meet again.

Many people have doubts that a sees b moving and b sees a moving. Why can't a be younger than b? Since the earth can be approximated as an inertial frame, b has to undergo acceleration and deceleration processes, and it becomes variable The motion reference system is really very complicated to discuss, so this problem that Einstein has already discussed has been mistaken by many people for the theory of relativity as a contradictory theory.

It is much easier to discuss this problem with the concepts of space-time graphs and world lines, but it requires many mathematical knowledge and formulas.

here only uses language to describe a simplest situation.

However, it is not possible to explain the details in more detail in words. If you are interested, please refer to some relativity books.

Our conclusion is that no matter in which reference frame, b is younger than a.

To simplify the problem, only discuss this situation. After a short period of time, the rocket accelerates to sub-light speed. After flying for a period of time, it will turn around in a very short time, and then fly for a period of time, and will meet the earth in a very short time.

The purpose of this treatment is to omit the effects of acceleration and deceleration.

It is well discussed in the Earth Reference System that the rocket is always a moving clock, and b is younger than a at the reunion.

In the rocket reference system, the earth moves the clock at a constant speed. The time course is slower than in the rocket, but the most critical point is the process of the rocket turning around.

During the U-turn, the earth crossed a half circle from a place far behind the rocket in a very short time and reached a place far ahead in front of the rocket.

This is a "super speed of light" process.

It's just that this kind of superluminal speed is not contradictory to the theory of relativity. This kind of "superluminal speed" can't convey any information, and it's not really superluminal speed.

Without this U-turn process, the rocket and the Earth cannot meet. Since different reference systems do not have a uniform time, they cannot relatively their age. Only when they meet can they be relatively.

After the rocket turns around, b cannot directly receive the information of a, because the information transmission takes time.

b The actual process I saw was that during the U-turn, the earth ’s time progressed rapidly.

In b ’s view, a ’s reality is younger than b ’s, and then quickly ages when turning around, and when returning home, a is slower than himself.

When I reunite, I am still younger than a.

That is to say, there is no logical contradiction in the theory of relativity.

If time travel is possible, why is there not yet time travellers from the future world around us? The subtext of this question is: Time travellers have not come around us. The most likely reason is that time travel has not been realized in the whole time stream-that is, forever.

The apocalypse scientists did not consider such a problem as a serious theoretical criticism of the time machine.

However, his question has caused some physicists to think, and they have found a possible answer: that is, the theoretical model that we currently know is possible to achieve time travel. The common feature of adaptability is that time travellers are not allowed to return to the era before the time machine existed.

Now Lin Feng has solved the crisis of the world of death, the rest is to find another hidden base, that is to say, there was a phenomenon of space distortion a long time ago, and the former Niya believers used space distortion to travel to Now it's time to destroy.

Although the time paradox Lin Feng has been seen in the scientific magazine in his supermarket, it is still unthinkable. Perhaps this is a bottleneck point of time energy. When Lin Feng communicates the sequence and correctness of time crossing, his time ability There will be a great improvement.

When I think about it again, Lin Feng regrets one thing. If he can get the energy of Kunajie, can he get the ability to pass through space from him?

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