美国作业代写：Super speed of light and time reversal

下面为大家整理一篇优秀的assignment代写范文- Super speed of light and time reversal，供大家参考学习，这篇论文讨论了超光速与时间倒流。大家都知道，爱因斯坦的相对论说速度越快时间就过的越慢，但速度达到光速之后时间就可以倒流吗？答案肯定是否定的。根据相对论，速度越快，时间越慢，但是时间永远也不会倒流，最多只会变的很慢很慢。从实际上说，人类尚不足以阻挡时间的前进；而从理论上来说，时间倒流是绝不可能的。

In the case of low speed motion, time uniformity and constant length are all meaningless concepts. But in the context of near-light speed and even FTL, it is relative, time can be faster or slower, and the length changes with speed. In the case of FTL, time can even flow backwards.

We are sailing now, the speed is far below the speed of light, and the FTL is the most distant thing, but you and I, the smart one, can expand the imagination and depict the adventures of the FTL voyage. However, to describe these adventures, we must start with Einstein's theory of relativity.

Albert Einstein, German-American Jew. Winner of the 1921 Nobel Prize in physics. He founded the theory of relativity, which represents modern science, it has laid a theoretical foundation for the development of nuclear energy, and its profound influence and wide application have opened up a new era of modern science, which is recognized as the greatest scientist and thinker since Galileo and Newton. In this doctrine of changing the world, he introduced us to the idea that we were unheard of.

How many years have we used the idiom "seeing as reality"? Don't worry, we might as well go into a high-speed train to do an experiment. As shown in Figure 1, if a rectangular compartment of a moving train to the right, a closed chandelier hangs in the middle of the ceiling, and a pilot is standing inside the compartment of the chandelier; there is an experimenter on the platform on the outside of the car. B and experimenter a stand on the same vertical line; If the experimenter A and b simultaneously measure the time when the light shines to the left and right sides of the train, two of the experimenters will be different:

For a pilot, his reference is for the carriage, so the chandelier is stationary relative to the carriage, so the light shines to the left and right side of the train. If the length of the car is 2L, the light reaches the left and right side of the train T1, T2, the speed of light is C, then there are: t1=lc= T2.

For Experimenter B, his reference system is the platform, so the chandelier is moving, its motion state is the same as the train compartment, then the light shines to the left and right side of the train the time is unequal by the basic principle of chasing and problem, two objects in the same straight line, fast speed and slow speed, the opposite and the line than the same direction and the time spent less. If v fast >v slow, s≠0, The/(v fast +) is/(v fast-v slow). Back to the above problem, because the light speed of the chandelier C far greater than the train speed V, while the distance l≠0, so L/(C+V) "L/ (-). That is, the light to the left of the train to the left of the car is less than the time to the right side of the car. It can also be understood: for B, when the left side of the light to the left of the car, in fact, the left side has shifted to the right a distance, that is, and when the light moves to the right of the carriage, the right side has moved a distance to the right, also equal to L, so in the eyes of the experimenter B, when the chandelier light to the left and right side of the train, the actual movement of the light to the left is L L, the right chandelier light is actually moving the distance is L + L, so the light left to the left of the train to the time of the L LC, light to the right side of the train to the right time for the l+ LC, obviously, L-LC can be seen, in determining whether two events occur at the same time, it is necessary to consider the selection of the reference system. The selection of the reference system is different, and the situation is different. It can be said that two events are related to the selection of the reference system.

You understand that? Two of the conductor can all see the same chandelier light, but the arrival of the train on both sides of the time is not the same!

Sitting in the parlor of the House, looking at the wall clock, the second hand took a lap, you know one minutes passed; in the process of cycling quickly to school, the second hand took a lap, and you had no doubt that the same as in your living room, also passed one minutes.

The theory of relativity tells us that the clock in motion slows down! As shown in Fig. 2, in a compartment of a a train, a reflector is fixed on the top of the car's height L, and an experimental member is seated inside the compartment of the reflector, assuming the train is moving at speed v to the right, for a, he is a reference system for the carriage, so the mirror is still relative to a, so the laser pen in his hand to the light from the vertical upward exposure to the reflector, and is reflected vertically down the mirror to a point where a So in this process a table recorded in the hands of the time t1=2l/c.

In the process, an experimenter was standing outside the car, and he was facing the experimenter a and the top of the reflector, he saw a laser pen in the hands of the light is along the triangle hypotenuse at the right side of the angle of the car to reach the top of the mirror, the light reflected by the reflector then travels along the hypotenuse of the triangle with the L-right side to the original a point where the train moves to point B, which means that the path of the light seen by B in this process is two hypotenuse lengths, because the hypotenuse of the triangle is larger than the right-angled edge, So in this process, the time in the hands of the table is recorded in t2=2l′/c. Obviously, here's the T1. Is this when you have doubts, then the life of the person in the exercise is not longer than the person standing on the ground? But for everyone themselves, they do not feel that they have spent the time of anything unusual, they feel that they have spent the time has not become longer, nor Shorten.

Because the movement of the universe is absolute, there is no absolutely stationary object, and it is because the movement of the object changes so that we can perceive the passage of time, because of the movement of atoms and molecules to change the shape of everything in the world, so that time is reflected, no movement and change, Time will not be reflected. For example, the molecule, the atom does not exercise, there will be no metabolism, because as chemical chemistry chemical reaction, the position of the molecule does not change will not happen to combine, people will not die can also be said to be a non biological just, everything in the world will be constant, no change will not show the existence of time, so no matter what kind of movement speed, life is limited, people are not aware of the absolute time, absolute time it does not exist. If in another galaxy the particle moves at a speed of One-one hundred millonth of the Earth, a man living on the earth seems to have lived on it for 10 billion years, a few With the sun and the moon, if you record her life to the Earth to show us, their actions are 100 million times times as slow as our own, for example, we eat for one hours, and they eat for 100 million hours, and they don't do more in 100 million hours. Therefore, the change of time is still in fact related to the reference system.

Now we're going to go back to FTL. We know that the fastest speed in nature is the speed of light in a vacuum. What would happen if we could sail at FTL?

Einstein's theory of relativity says that the faster the speed, the slower it will be. When the speed is close to the speed of light, the time is almost stationary, and when the speed reaches the speed of light, the time can be reversed. In fact, our study of the problem has not yet reached the point where it can be demonstrated, so theoretically, can time really go backwards?

FTL is just a hypothesis, for example, the stars have been seen, You should also know that stars are tens of billions of light-years away. Theoretically, the light that we see is transmitted over tens of billions of years ago and reached the Earth now and into the eyes of man. That is to say, these things no longer exist. If a spacecraft could shoot a star down to the Earth at a speed of FTL, it would theoretically be possible to see the light transmitted in advance. So the inference goes on, that is, the sight before the light, this is the so-called time reversal.

Of course, this is just a hypothesis. And what are the realities we know at the moment? In short, according to the theory of relativity, the faster the speed, the slower the time, but the time will never flow back, the most will only become slow and slow. There is the current two big can not be exceeded, one is absolute zero cannot be achieved, the second is that the speed of light cannot be exceeded, so FTL is not going to work. In fact, human wisdom is not enough to stop the flight of time, and according to Einstein's theory, time and space can change in the speed of light, so in theory, time back to the past is not impossible.

Well, on the assumption of FTL, just wait until you finish reading this article.

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