Time travel-human dream

Time travel-human dream
Time travel --- the dream of mankind is people's ideal to travel through time. For most people, time travel can only exist in imagination and literary works, which is always beyond reach, but there are still some people who are working tirelessly In pursuit, they believe that one day humans will be able to control time and travel freely between the past, present and future.

For humans, there is nothing more difficult than conquering time. Time machines and time travel have therefore become a fascinating topic, which will always arouse people's unlimited reverie.
Under the existing scientific system, time is strictly unidirectional. Of all the laws of physics, only the second law of thermodynamics has arrows in the direction of time, which gives people a feeling that time flows and disappears. So looking back at the past, or looking ahead in the future, has become an eternal dream for mankind.

Time travel-human dream

   Recently, Ronald Mallett, a professor of black physics at the University of Connecticut, declared that he had mastered the theory of making time machines. In order to be able to return to the past and save his father who died of heart disease due to smoking and drinking alcohol, Marrett devoted all his time and energy to the research time machine. Recently he claimed that he had succeeded. As long as someone gave him $250,000, he could build a time machine. Coincidentally, the British "Daily Telegraph" reported that Amos Ori, a professor at the Israeli Institute of Technology, showed a theoretical model of a time machine. This theoretical model is based on the law of gravitation, according to this law, time will be affected by objects Distorted by gravity, when the degree of distortion is large enough, a ring can be created, and the possibility of time travel appears. But Professor Auri cannot predict when the real time machine will come out, or whether it will come out.

Time travel-human dream
In 1895, the famous British science fiction writer HG Wells wrote the science fiction "Time Machine". Since then, people have started various dreams about time and space travel. In fact, time travel has also taken shape in ancient Chinese thought. Liu Liao, a professor of the physics department of Beijing Normal University and a famous expert on relativity in China, told us that Hui Shi, an ancient Chinese thinker who lived for more than 300 BC, proposed the idea of ​​time travel . Zhuang Zi once mentioned a "wonderful idea" of Hui Shi in "Ten Things of Historical Objects"-----"Today comes and goes". For more than 2000 years, people have been unable to understand this sentence, and some people even suggested that this may be a kind of "nonsense". Liu Liao believes that this sentence is precisely discussing and fantasizing "traveling against time". It means: "Departure to Vietnam today, arrived yesterday." How can we make the arrival earlier than departure? Then only travel against time.
The instant travel was included in the scientific field for discussion. After Einstein published general theory of relativity in 1915, mathematician Gödel, physicist Newman, Frank J. Tipler and others successively used Einqitan’s field equation The solution to allow time travel is obtained in The famous American astronomer Carl Sagan proposed the "wormhole" theory in his 1986 science fiction novel "Contact", which believed that there must be a connection to the outside in the time and space where human beings live. He has always believed that from a macro perspective, human history is just an experiment of time, and all time points are just physical elements.
Before the 1980s, few people in China or in China discussed the theory of time machines. It was not until three American physicists proposed in 1988 that the time machine could not be denied from the perspective of theoretical physics, which shocked the theoretical physics and philosophy circles. Since then, there have been more and more studies on time machines, and many ideas about making time machines have appeared.
Time machine
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Is documentary time travel possible? Hawking once held a "cautious optimism"
Wormholes are sometimes called star gates; they provide a shortcut between two points in space that are far away from each other. Skip a hypothetical wormhole, you may appear on the other side of the galaxy after a while. The wormhole naturally conforms to the general theory of relativity. With gravity, it can not only bend the space, but also twist the time. Theory allows the existence of such alternative paths and tunnels connecting two points in space. Mathematicians have proposed the spatial form of multiple connections. Just as the tunnel through the bottom of the mountain is shorter than the road on the surface of the mountain, the wormhole may also be shorter than the ordinary route that runs through ordinary space.
1. Find or build a wormhole and open a tunnel to connect two different areas in space. Large wormholes may naturally exist in outer space and are remnants of the Big Bang. If this is not the case, then we have no choice but to use wormholes smaller than atoms, which are either natural products (around us, every minute there are such small wormholes born and died), or artificial products ( As shown in the picture here, they are produced by particle accelerators). These smaller wormholes must be expanded to practical sizes, perhaps using energy fields that cause space to expand shortly after the Big Bang.
   2. Stabilize the wormhole. Injecting the negative energy generated by the quantum using the so-called Casimir effect, the wormhole allows signals and objects to safely pass through it. Negative energy will resist the tendency of the wormhole to collapse to a point where density is infinite or close to infinity. In other words, it prevents wormholes from becoming black holes.
   3. Tow the wormhole. A highly advanced technology spacecraft separates the entrance to the wormhole. An entrance may be placed on the surface of a neutron star, which is an extremely dense star with a strong gravitational field. Strong gravity makes time slow. Because at the other entrance of the wormhole, time passed faster, as a result, the two entrances were separated not only in space but also in time.
There have always been two types of time machine and time travel. Most people think that time travel is impossible, especially backward travel-back to the past, it is impossible to achieve. Others believe that time travel is promising, especially when traveling forward-to the future, even if traveling backwards, if one day can break through classical theoretical physics, it can also be achieved.
The famous British physicist Hawking believes that there is no time travel: "We do not have any reliable evidence to prove that there are visitors from the future." He did not specifically put forward a rebuttal argument, arguing that this time machine not only violates the law of cause and effect (there are reasons and then The result is that the time and space created are unstable. From a philosophical perspective, a time machine cannot exist because it violates the law of cause and effect. If the time machine "travels against time", it will cause damage to the law of causality and cause logical confusion. There is a famous paradox: if you have the possibility to go back and kill your father, how can you be born?
However, at the Royal Society, some space physicists are more or less opposed to Hawking's view. John Gribin, an astronomer at the University of Sussex in the United Kingdom, believes that the time travel concept has developed greatly after several generations of scientists. He said that if you study Einstein's general theory of relativity in depth, you will find that Einstein has always believed that time travel is difficult, but it is not completely impossible. Liu Liao believes that although the time machine has no hope of being made, by studying it, people can know more precisely which physical law it violates, which can help people understand the most basic laws in theoretical physics To be more profound. From this perspective, the time machine has certain research value.
Back in the past is also the most talked about in science fiction. The new generation of science fiction writer Liu Cixin said that a "watermelon skin theory" can be used to refute the law of cause and effect and prove that people can go back to the past. The meaning of this theory is that there will always be a physical mechanism that prevents travellers from going back in time to make changes to the past. For example, a person wants to go back to kill his father, but was slipped by a piece of watermelon peel. No matter how many times you go back in time, there will always be an unexpected situation that prevents you from killing your father. But this theory itself is also very problematic, because as long as you go back to the past, it already has an impact on the future. According to the butterfly effect, any one of your actions will be infinitely magnified in time, thus affecting the future.
As long as the energy is sufficient, this energy must be huge. For example, he said that a spaceship as large as a bus would require 100 times the energy used by industry around the world to reach 99% of the speed of light. This seems impossible in the 21st century, but not necessarily impossible in the future. In the future, there may be black holes and unimaginable energy. In addition, if hibernation technology can be developed, people will be frozen, physiological metabolism will be completely stopped, and then thawed in a certain era in the future, from a certain perspective, it is also a time travel to the future.
Liu Liao believes that a large amount of negative energy is required to create "wormholes" to travel in time and space. Although there are negative energy substances in the universe, the amount is very small, and the negative energy cannot be obtained by macroscopic methods, but only by microscopic methods (quantum mechanics can obtain some negative energy, but the amount is extremely small). Therefore, from the perspective of theoretical physics, the manufacture of time machines is extremely difficult.
Life extension
Time travel seems so vague, why are people still keen to discuss this topic and tirelessly pursue the manufacture of "time machines"? Scholar Fang Zhouzi believes that the clearing of time machines and time travel is very interesting, both philosophical and theoretical physics. "If it is possible to go back to the past to change the course of history, or roam the future to foresee the course of history, it would be a wonderful thing." But he also said that in theory, a model of a time machine was proposed, not that it would Can be achieved.
Liu Cixin said that time travel also reflects one of the deepest desires in people's subconscious mind-----expanding life, hoping to pursue eternal life in time. Science fiction writer Han Song also believes that one is driven by curiosity and the other is that human life is too short, and he always hopes to cross the river of time and see more things in his lifetime.
Film and television works
"Time machine"
In the world of science fiction, the theme of time machines has always been well received [2]. In the "Time Machine" by British novelist Wells, a man is obsessed with time and space
The British physicist of the time machine shuttle theory suddenly received the news that his fiancee was killed in a car accident on Christmas Eve. He decided to speed up the process of making a time machine. The machine was finally made. Although he saved his fiancee's life in an instant, he couldn't stop the fiancee from encountering another accident. "Time Machine" has been continuously adapted and put on the screen in the past century, and the latest one was released in 2002.
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