Does nine dimensional space have physical significance Why only study three dimensional space?

Physically. Some scientists believe that the universe is multidimensional, and the three-dimensional space we live in is just a projection of the multidimensional universe.

For example, if a teacup is placed on a piece of paper, the bottom of the cup can be thought of as a projection of three dimensions (the teacup) in two dimensions (paper). Suppose there are intelligent beings on the two-dimensional paper, and the three-dimensional teacup itself is a mysterious thing for them. When a teacup is placed on paper (thinking that the bottom of the cup coincides with the paper), their entire sensory perception of the teacup is only the bottom of the teacup; Even if you pick up the teacup, they have no perception of the teacup at all.

If the universe is not three-dimensional, but multidimensional, then the situation faced by man is very similar to that of two-dimensional beings facing three-dimensional space. Many of the things we are familiar with may be just a projection, and they are very different from what we see. At the same time, most of the things in the universe are imperceptible to us.

Similarly, two-dimensional creatures are incapable of perceiving most things in a room other than a piece of paper.)

Of course, mathematically speaking, the practical meaning of multi-dimensionality itself is not as important as physics, but may only be to solve problems or solve problems more conveniently.

Yes. In mathematics, high-dimensional space is studied higher than three-dimensional space. It's not just nine-dimensional.

In physics, some scientists believe that the universe is multidimensional. They believe that the universe can be divided into nine dimensions, connected by a critical point, and the relationship between time and space is that the higher the dimension, the better, the faster the time.

Concept: We can divide the universe into nine dimensions, each of which is connected by a critical point, and the relationship between time and space is that the higher the dimension, the shorter the time (faster).

The space we humans live in is a three-dimensional space, that is, between a four-dimensional and a two-dimensional space. In real life, we will find a modern macro car image, that is, when doing different things, sometimes it feels like time is passing very slowly, and sometimes it is as fast as flowing water. Why is that?

Because when people are in different states, the dimensionality shifts in a certain direction because of the different things they do.

Fantasy, when it feels like time is passing fast, we are shifting to the four-dimensional space, and vice versa, to the two-dimensional space. Many people often take sleep to pass the time when they have nothing to do, and sleep often gives people the feeling that it is only a few minutes from falling asleep to waking up, which shows that people in sleep are very close to the four-dimensional space. (But people's "mental time" is not limited to the following factors.)

What do we do if we want to really enter a four-dimensional or two-dimensional space? Theoretically, it is very simple, that is, it is enough to change the speed and break through the two critical points that connect the three-dimensional space.

Space as we know it, as the form of existence of all things, that is, the measurement of the shape and position of all things, depends not only on the nature of the physical world, but also on the structure of our senses and brains. We can't even determine which of the two is more important.

If we simplify the space we intuitively know to a flat Euclidean space, then we can know that the so-called three-dimensional description method actually comes from the coordinate system of analytic geometry (such as the Cartesian Cartesian coordinate system, of course, the polar coordinates are the same), we need three independent parameters to locate a point, one less is not enough, and one more is redundant.

In fact, the space that we intuitively know in our daily life is three-dimensional, and based on our intuition and Euclidean geometry, it should be said that it is an objective existence, inconceivable, unchangeable, and can only be accepted as an axiom.

Three-dimensional space, in daily life, can refer to the space composed of three dimensions: length, width and height. Moreover, the term "three-dimensional space" used in daily life often refers to three-dimensional Euclidean space.

A space where the location of a point is determined by three coordinates.

The objectively existing real space is three-dimensional space, with three measures: length, width, and height. The concept of multi-dimensional space introduced in mathematics, physics and other disciplines is a scientific abstraction made on the basis of three-dimensional space. It is also called three-dimensional space.

Two spatial dimensions, one temporal dimension. Although it seems to be more than that.

It could also be a three-dimensional number axis.

Dimensions, also known as dimensions, are the number of independent parameters in mathematics. In the realm of physics and philosophy, it refers to the number of independent space-time coordinates. Dimension 0 is an infinitesimal point with no length.

1 dimension is an infinitely long line with only length. 2D is a plane that is made up of an area made up of length and width (or part of a curve). 3 dimensions is 2 dimensions plus height to make up the volume.

The 4 dimensions are divided into 4 dimensions in time and space, and people often refer to the transfer of objects in time. (4 dimensions, to be exact, there are two kinds.) 1.

Four-dimensional space-time refers to three-dimensional space plus one-dimensional time. 2.Four-dimensional space refers to only four dimensions of space.

Four-dimensional motion gives rise to five-dimensional.

The sixth dimension refers to thought, independent of time and space in common sense, and the sixth dimension is similar in nature to time, both beyond the physical realm, but higher than time. The universe in which we live cannot transcend the sixth dimension, but only operates within it. Just like a computer program, the program itself can only be run on a computer, although the results of the program's execution may have an impact on time and space.

In superstring theory, there are eleven dimensions of the universe. The world beyond the five dimensions is a world beyond human comprehension, and we can only theoretically confirm its existence, but cannot describe what kind of world it is. Also, the low-dimensional world cannot interfere with the high-dimensional world, and the high-dimensional world can change the low-dimensional world.