If the physical description of a theory can't even be understood by children, it may be useless. Fortunately, there is a simple physical description behind string theory, which is based on music.

According to string theory, if you have a super microscope that can be used to spy on the electron center, what you see will not be a point particle.

, but a vibrating string.

This string is tiny, only 10 _ 33cm long.

It's a billion times smaller than protons. Because it is so small, all subatomic particles look like a point. If we pluck this string, its vibration will change; Its electrons may become neutrinos.

If you tear it off again, it may become a quark. In fact, if you pull it with proper force, it will become any known subatomic particle. It is in this way that string theory can easily explain why there are so many subatomic particles. There is nothing else on the superstring, only all kinds of "notes" that can be plucked. For example, on the violin,

A, b or c are not essential. As long as you pluck this string in different ways, you can make all the sounds in the scale. For example, a flat B key is not more important than a G key. They are just notes on violin strings, nothing else. Similarly, electrons and quarks are not essential things, but strings are essential things. In fact, all the particles in the universe can be regarded as different vibrations of strings, and nothing else is counted. All kinds of "chords" on strings constitute all kinds of physical laws.

Chords can interact by splitting and reconnecting,

This produces the interaction between electrons and protons that we see in atoms. So we can reproduce all the laws of atomic and nuclear physics through string theory. The "melody" that can be written on a string is equivalent to the laws of chemistry. Now, we can regard the whole universe as a magnificent string symphony.

String theory can not only explain that the particle in quantum theory is the note of the universe, but also explain Einstein's theory of relativity-it is the lowest vibration of a string, and the zero-mass spin _2 particle can be explained as a gravitational particle or quantum. If we calculate the interaction of these gravitons, we find that it is Einstein's old theory of gravity expressed in quantum form. With the movement, disassembly and recombination of strings, it will cause great constraints on time and space. When we analyze these constraints, we once again find Einstein's original general theory of relativity.

In this way, string theory can perfectly explain Einstein's theory, and there is no extra work to be done. Edward? Edward witten said:

Even if Einstein did not discover the theory of relativity, his theory may still be found as a by-product of string theory. In a sense, general relativity can be picked up at will.

The beauty of string theory is that it can be compared to music. Music provides a metaphor, which we can use to understand the nature of the universe from subatomic and macroscopic levels. Like the famous violinist Yehudi? Mei Niuyin once wrote: "Music seeks order in chaos, because the rhythm is consistent in its own way;" Melody makes disjointed things run through before and after; Chords find matches from different things. "

Einstein may write that his exploration of the unified field theory will eventually enable him to "read the mind of God". If the string theory is correct, then we have now seen that the mind of God is the universal music echoing in the 10 dimensional hyperspace.

Just like gottfried? Gottfried leibniz once said: "Music is a disguised mathematical exercise that the soul does, and it doesn't even know that it is calculating."

Historically, the connection between music and science was formed as early as the 5th century BC, when the Pythagorean school in Greece discovered the law of harmony.

And simplify these laws into mathematics. They found that the tone produced by plucking the strings of the lyre corresponds to its length. If you double the length of the strings, the pitch will drop by a full octave. If you shorten the strings by two thirds, the tone will change by five degrees. In this way, the theorem of music and chord can be simplified to an accurate numerical relationship. No wonder Pythagoras' motto is "Everything counts". At first, they were very satisfied with this result, so they boldly applied these harmony theorems to the whole universe. But their efforts failed because of the extremely complicated materials. However, in a sense, with string theory, physicists have realized Pythagoras' dream.