The universe is believed to have originated from a big bang, the big bang is the starting point of time and space in the universe, after which the timeline continues to extend, space continues to grow, and various things in the universe are constantly changing, all of which are irreversible, which is also basic common sense. However, on March 16 this year, the American Fun Science website published an article titled "Our Universe May Have a Time Backwards 'Twin'", which was created by Paul Sartre, an astrophysicist at the State University of New York at Stony Brook, who believes that there may be an anti-universe in or outside the universe - the CPT mirror universe, where many things are contrary to the situation of our universe, such as time will flow back there, or even back to before the "Big Bang".
Paul Sartre was one of the discoverers of a variety of singular children smaller than quarks and gluons, and he analyzed the expressive characteristics of certain particles that the universe was born at a very small, extremely high temperature, and matter was very dense, but the distribution of matter was also very uniform, and time seemed to be symmetrical, and the timeline was both forward and backward, so there may be another "anti-universe" that is completely opposite to our current universe, and the characteristics of matter in time and space are completely opposite.
Physicists such as Paul Sartre have discovered a set of fundamental symmetries in the study of elementary particles, the three most important symmetries are: positive and negative charge symmetry, cosmic symmetry, and time inversion symmetry, which have been named CPT symmetry in physics - "C" refers to the charge, "P" refers to the cosmic name, and "T" refers to time.
After the theory was proposed, it attracted the attention of the global physics community, and found that the physical interaction of many things in the universe follows the above symmetry, which shows that the development of things may have a reverse factual deduction, if the interaction is inverted from the three dimensions of charge- cosmology - time at the same time, there will be exactly the same performance. Therefore, many physicists have proposed that this study of the symmetry of Paul Sartre's combination should be expanded.
The forces and fields that make up the physics of the universe have been thought to apply to symmetrical interactions, and physicists believe that the theory should also apply to the universe itself, that the evolution of the universe is moving forward over time, that it is getting larger and more complex in structure, accompanied by a large increase in entropy, and that if the concept of CPT symmetry is to be extended to the universe itself, then there should be a completely opposite mirror universe, so as to conform to the CPT symmetry theory.
Scientists also speculate that this anti-universe has the opposite charge to the particle charge in our universe, many things can be opposite mirror images, and will turn back time, to be precise, the universe and the anti-universe are like twins, but each has its own characteristics, and its characteristics are symmetrical to each other, following CPT symmetry.
So where is this anti-universe? Maybe we'll never be able to see it, because from the beginning of the Big Bang, it extended to the other side of the universe, and where is this "other side"? None of us know! Maybe it's in our universe, maybe it's just outside the universe.
But in fact, at the current astronomical observation level of our human beings, we can't even see the universe we are in, exhausting human capabilities and wisdom, and we can only observe things about 46 billion light-years away from us, because at this distance, the expansion rate of the universe has reached the speed of light relative to us, then the light emitted by things there will never be able to return to where we are, so we will never be able to see there, but it is not the edge of the universe. It can only be said that it is the edge of the observable universe, and beyond the observable universe, how big is our universe? It is not clear now, as for the anti-universe, it can only be said to be a theoretical speculation, which is even more difficult to understand and observe, and even the method of verification cannot be said.
Resources:
"Guangming Network" March 20 article "US media: the universe may have a time backwards "twins""
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