According to a study on the principle of holographic, physicists have put forward important new understandings of the theory of relativity and found that some strange physical phenomena occur inside the black hole, that is, space-time is reversed inside the black hole.
In the world we know, physical processes and time direction are completely symmetrical. Maybe you can't understand this meaning. For example, when you look at a pendulum that keeps swinging left and right, you can't determine whether time flows forward or reverse, but the pendulum will eventually slow down due to friction and eventually stop swinging. At this time, we believe that the flow of time is positive. Of course, this is what we define as the positive flow of time. The directionality of time and our perception of it are called "Arrow of Time" by British astronomer Arthur Eddington, which is related to the entropy of the universe.
Entropy value is usually described as a measure of system disorder, that is, as time increases, the universe becomes increasingly disordered. If you also feel a little confused about this concept, let’s give another example. For example, if our home is not cleaned, the home will become more and more messy. As time goes by, the house you make will not become more and more tidy, but will only become more and more disordered. This is entropy. Therefore, many scientists believe that there must be some connection between entropy and our perception of time. If we see a broken egg, recombined it on the ground into a complete egg, and jump back into the egg trough ourselves, we will know that time and space have reversed.
object entropy is a wide property, which is proportional to volume. It was discovered in 1974 that the entropy of a black hole is actually related to the area of the event horizon. The event horizon is the space-time boundary that separates the observer from the black hole. In the black hole, nothing can escape from the event horizon. This discovery leads to the definition of the holographic principle, which states that in three-dimensional space, all information about the black hole we observe is encoded on its two-dimensional surface, similar to the video we take in three-dimensional space, which becomes two-dimensional when we see it on the screen. This new study attempts to make up for a major lack in black hole physics, that is, the time direction problem in black holes, and its basic idea is based on the holographic principle.
We treat the event horizon as a holographic screen, and then compare the holographic screen of the past black hole with the holographic screen of the future black hole. When the entropy value of the black hole event horizon increases, time flows forward (as we think it is positive). If the entropy value of the black hole event horizon decreases, time flows backward. This is a very smart method, but how to determine whether the entropy value of the black hole event horizon increases or decreases? This is the key to the problem. In the definition of thermodynamics , entropy can be regarded as the energy lost by a system forever. This law applies to the entire universe. The entropy arrow is consistent with thermodynamics . Therefore, when we observe the black hole event horizon, we can calculate whether the entropy value of a black hole increases or decreases according to thermodynamics law .
So, after observing and comparing the changes in the entropy value of the black hole event horizon, scientists produced a strange result. When things inside the black hole react to the event horizon, their entropy value actually decreases, that is, in the black hole, everything becomes more organized rather than more chaotic. Therefore, it can be said that the thermodynamic time in the black hole is regressing. Female physicist Netta Engelhart told the World Physics Journal: "The space-time inside a black hole is likely to be reversed. Although we have always believed that the time inside a black hole is stationary, it is a pity that I was wrong. However, even if we were wrong, it is still worth being happy, because the time reversal inside a black hole is obviously more exciting than the time resting."
This is an interesting discovery, isn't it? And it solves a long-standing problem in black hole physics. Maybe everyone wants to experience what it feels like to reversal of time, what do you think?
