Do you know how the multidimensional universe came about?

In real life, we often hear people say that dimension is two-dimensional, and that is three-dimensional. Just like the cartoons we watched when we were young, if the characters in them can come out, they are secondary figures. And our real space is a three-dimensional space. So how many dimensions does our universe have? Let me talk about it.

In Einstein's view, "four dimensions" is the lowest dimension that constitutes the real world. Our universe is a "four-dimensional space-time", a real three-dimensional space combined with "extra dimensions". In our universe, time and space are inseparable whole, but in essence, our universe is still three-dimensional.

There is a huge difference between four-dimensional spacetime and four-dimensional spacetime. The essence of four-dimensional space-time is still three-dimensional. Living in a four-dimensional space-time, we can only feel "length", "width" and "height", that is, the three different coordinate axes of X, Y, Z, Y and Z. Although they exist, they cannot perceive and change time.

Theoretically speaking, "four-dimensional space" is a general four-dimensional equivalent composed of countless three-dimensional spaces, just as two-dimensional space is composed of countless three-dimensional spaces. People who live in three-dimensional space can never understand the concept of four-dimensional world. The famous "Klein bottle" is a curved surface that can only be presented in four dimensions, and humans can never create a real Klein bottle in it.

If the world in the painting is two-dimensional, then as three-dimensional creatures, we can modify the painting at will, but the so-called two-dimensional in our world still has a certain thickness. The real two dimensions are beyond our comprehension. Similarly, four-dimensional creatures cannot understand three dimensions. If you enter the four-dimensional space, you will not become an omnipotent "god."

If a person enters the four-dimensional space and then returns to the three-dimensional, then he will have a very special state of axial symmetry. This is because scientists generally believe that four-dimensional space has "axial symmetry", but there is no axial symmetry in three dimensions. If a person really enters this state, the result of dimension expansion will be very tragic. There is no end to the four-dimensional space. Scientists believe that the essence of the universe is "ten dimensions"! Those spatial dimensions are real, but we can't feel them. These high-dimensional spaces may curl up in a corner of our universe, forming a very special form, which cannot be discovered by human technology today.

The concept of eleven-dimensional domain is put forward from string theory and upgrade theory "M theory". The concepts of time and space-time are different. Time is actually a "pseudo-dimension". For example, four-dimensional space-time refers to three-dimensional space with a time axis, while five-dimensional space-time is four-dimensional space with a time axis. String theory is a kind of "The Theory of Everything", and it is also the only theory that hopefully unifies the four basic forces. String theory belongs to theoretical physics, and modern science and technology can't verify it, so everything described by string theory can't be verified for the time being. In order to unify the four basic forces to explain the problems that physics can't explain at present, string theory needs the universe to be an eleven-dimensional space, and string theory can explain all kinds of interactions and all physical phenomena.

In fact, four-dimensional and eleven-dimensional spaces only exist in theory, because human beings can't understand them and naturally they can't find them. In order to explain some unexplained phenomena in the universe, we need these bits to exist before the theory can be established. But fundamentally, the speculation about these high-latitude spaces is based on three dimensions, and whether the nature of the universe is multidimensional or unknown. String theory holds that the basic unit of the universe is "string", and the vibration of these strings produces all kinds of basic particles and physical phenomena, while string theory is more reasonable in explaining quantum "wave-particle duality" and quantum entanglement.

Due to the contradiction between quantum mechanics and relativity, people's understanding of the nature of the universe is not deep enough. Scientists have been hoping to find such a big theory, but at present, only string theory can achieve great unity and cannot be verified for the time being. Of course, with the development of physics in the future, there may be no need for a big unified theory to explain these problems, and other new problems may arise. For example, all problems in the universe must be expressed by a perfect formula, which may never be done.

This is the origin of the multidimensional universe. Although it is still in the theoretical stage, if other dimensions of the universe can be discovered in the future. It's hard to imagine what the universe really looks like. It is also possible for civilizations of all dimensions to develop and live together.