If time travel really exists, how should humans achieve this?



In your space, is time accelerating, or is it slowing down?

This may sound a lot like a sci-fi plot, but time misalignment does exist. But what exactly does that mean? Simply put, the dislocation of time means that the passage of time becomes abnormal-faster or slower than normal.

Physicists know that time misplacement has existed for more than 100 years, and in fact, you are in a sense of time dislocation.

In 1905, Einstein published the famous "Special Relativity". After 10 years, he published a more shocking "General Theory of Relativity." This theory contains a lot of new ideas that almost completely subvert the traditional human cognition. For example, Einstein pointed out that gravity is actually a product of time and space bending. In other words, any object with mass will cause time and space to bend. It can also cause time misalignment.

It is easy to understand that the object with higher quality will have a more pronounced distortion effect on time and space. Supermassive black holes, whose mass is equivalent to billions of times the mass of the sun, will cause significant time misalignment. If you get closer to a black hole, the strong gravity of the black hole will gradually cause the time to "expand". The intuitive result is that the speed of time is significantly slower than the area away from the black hole. However, if you want to travel through time and space and want to have something to go back, I am afraid that the black hole will not be your ideal time machine; when you cross a boundary line called the "Event Horizon", you, or any substance, Even the light, including the light, will be doomed to go back - this is also the origin of the "black hole".

The sun and the earth can also cause time expansion to a considerable extent. In 2007, a NASA satellite called Gravity probe B tested and confirmed the correctness of Einstein's general theory of relativity by observing the bending effect of the Earth on the surrounding time and space with 99% accuracy. Let's go one step further: imagine that you live on the top of a mountain, and in fact you will be older than your friends who live by the sea, because your friends have a stronger gravity near the sea level than at your high altitude. This means that the passage of time is slower-of course, because the gravitational field of the earth is not very strong, the effect of time expansion will not be obvious. The difference in time between you and your friends can in fact be too small for you to notice.

Time expansion can also be achieved by rapid movement. According to special relativity, the faster you move, the slower your time will become than an observer in a static state. Such time expansion effects are much more common in our lives, and every time you use GPS positioning, you are already associated with this effect.

Ken Olum, a professor at the Institute of Cosmology at Tufts University in Massachusetts, said: "One of the working principles of GPS satellites is that the star is equipped with an ultra-precise clock." He said: "The GPS in the sky. Satellites operate at different altitudes and at different speeds, and there is relative motion between them. So, in order to ensure that the satellite can accurately determine your position on the Earth's surface, GPS satellites must consider general relativity when timing. The effect of the special theory of relativity on the speed of time passing, otherwise unacceptable positioning errors will occur. It can be said that without Einstein's theory, the global positioning system will be difficult to develop.

Of course, the bending of time and space of large objects may not be the kind of time and space that the sci-fi writers like. So are there other possible scenarios? Maybe, but the possibility of realizing it is not too high.

Benjamin Schal (Benjamin Shlaer), a physicist at the University of Auckland in New Zealand, said: "there is a general consensus that weird ideas based on general relativity, including time machines, are based on general relativity," said Benjamin Schal, a physicist at the University of Auckland in New Zealand. It's basically impossible in the real universe. "

But although the possibility is not big, it does not prevent us from talking about it. The number one is the so-called wormhole. This is a theoretical existence of a "tunnel" in space and time that allows material to be transmitted instantaneously to an extremely remote place. Some theories suggest that in the very early days of the birth of the universe, there may have been tiny wormholes, but these wormholes are extremely unstable and fleeting.

In order for the so-called wormhole to really play a role in time and space travel, you will probably need some strange substances. To stabilize wormholes, the theory is that you need to develop something strange that is difficult to describe at the moment. It is different from anything you touch, it must have negative mass and negative pressure – even scientists I have never seen such a thing, and they believe that it is unlikely to develop such a thing for the foreseeable future.

The second way is the so-called cosmic string. Cosmic strings are theoretically possible energy beams, and if they do exist, they must be extremely small. The theoretical prediction shows that the acceleration between the two cosmic strings will cause time changes in a strange way, such as a closed loop in time and space, thus playing a similar role as a time machine. However, if you want to accelerate the cosmic string to a certain extent, it is possible to have such an effect, and to achieve such acceleration, you will need almost unlimited energy supply, which is obviously not something you can easily do.

In Shale’s view, if there is any hope in the future to have the opportunity to understand such strange substances or other mechanisms that can bend time and space, the most promising way is to observe the universe through a telescope. Maybe one day we will get unexpected discoveries. .

Shale said: "It is very clear that many things we think of are not necessarily established under extreme environmental conditions. The only thing we can hope for is that we will be able to raise these issues in the field of cosmology. And find the answers to these questions."

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