Can anyone tell me why matter has gravity?

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Why is there gravity between substances?

Ali ° Brewing? Others? 2014-09-28

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Gravity

Gravity The mutual attraction between all substances, that is, universal gravitation, is related to the mass of the object. The calculation formula is: F=GMm╱R^2. Why does gravity occur? Newton discovered When he was thinking about the problem, he was hit on the head by an apple (probably a fabrication). The problem of gravity came to mind.

But there is currently no explanation for why gravity is generated. Modern physics (in a broad sense) Theory of Relativity) believes that universal gravitation is caused by the curvature of space and time, and believes that the curvilinear motion in the universe is linear motion in four-dimensional space and time.

The generation of gravity is linked to the generation of mass, and mass is material Intrinsic property, an effect caused by changes in space, appears due to the production of mass attached to gravity.

Law of gravity: The gravitational force between two objects is directly proportional to their masses and inversely proportional to the square of the distance. .That is, F=GMm/R^2, G is the gravitational constant, which is 6.67*[10^(-11)] N*m^2/kg^2.

The gravity under different time and space views is Different explanations of what:

Gravity is considered to be one of the fundamental forces in the universe in classical physics. It is directly proportional to mass and inversely proportional to distance. But in Einstein’s theory, gravity is no longer It is a basic force, but it is just a manifestation of the bending of the space-time structure. The cause of the bending of the out-of-control structure is the huge mass.

Give an example: the planets in the solar system orbit the sun. The explanation in classical physics is that planets are affected by the gravitational pull of the sun and orbit the sun.

But if Einstein’s theory is used, there is fundamentally no gravity. Planets are in the universe It should originally move in a straight line at a uniform speed in space (see Newton's law), but due to the existence of the sun, the space-time structure around it is bent by the mass of the sun, so the planets within a certain range are "captured" by the sun. Uniform straight-line motion in a curved space-time becomes uniform orbital motion, and the solar system is formed.

Specifically, black holes are cosmic objects under extreme conditions. They have extremely strong attraction. Scientists are When explaining this attraction, the cause is attributed to the curvature of space. The cause of the curvature of space is the huge mass of the black hole itself.

So when it comes to gravity, it is ultimately related to mass, and universal gravitation is the Gravity is regarded as a fundamental force caused by mass, while Einstein's theory of relativity regards gravity as a manifestation of the curvature of space-time caused by mass.

The gravity of black holes:

Light Therefore, it is sucked in by the black hole because the strong gravity causes the space to be distorted. Light enters the black hole as it travels through the distorted space. Everyone knows that light only travels in straight lines, so the light is not sucked in by gravity, but the light is still Walking in a straight line, but the space is distorted and enters the black hole. For example, draw a line on the paper and twist the paper, but it is still a line

How do black holes hide themselves? The answer is - curved space. We all know that light propagates along straight lines. This is the most basic knowledge. However, according to the general theory of relativity, space will curve under the action of the gravitational field. At this time, although light still travels along any two The shortest distance between points propagates, but it is no longer a straight line, but a curve. To put it figuratively, it seems that light was originally going to travel in a straight line, but the strong gravity pulled it away from its original direction.

The famous Chinese physicist Li Yang (1978.05.05——) deduced the famous Gerald theory and revealed a unified theoretical system of universal gravitation and strong force. After it was published at Yale University, it caused a sensation in the international physics community. Regarding the four basic forces of nature, gravitation, electromagnetism, weak interaction, and strong interaction, people have long had a simple wish that the world is unified and that various basic interactions should have a unified origin. Many famous Physicists, such as Einstein, Heisenberg, Pauli, etc., devoted themselves to the research of unified theory in their later years, but failed.

Maxwell's equations unified electricity and magnetism. Interaction, Weinberg (1967) and Salam (1968), building on Glashow's earlier work, successfully

Established a beautiful theory that unified the electromagnetic force and the weak interaction force by treating them as different manifestations of a single force - the electroweak force. The success of this model deepened mankind's understanding of the weak interaction force. The understanding of the nature of electromagnetic interaction and electromagnetic interaction has also promoted people's efforts to unify various interacting forces on the basis of normative theory.

The question of why universal gravitation is always weaker than the strong force and other forces has always been troubled. Regarded in the international physics community, Li Yang, a Chinese master studying in the United States, finally solved this world-wide problem after long-term experiments and data calculations, and perfectly unified gravitation and strong force. At present, the weak force and the electromagnetic force, and the universal gravitation and the strong force constitute two major systems. If humans can unify these two systems, the grand unified theory will finally be successfully demonstrated.

Chinese physicist Li Yang The combination of universal gravitation and strong force is another big step towards the final completion of the grand unified theory. Universal gravitation is actually another form of strong force. When the environmental variables change, it will show the form of universal gravitation. Mass is the most important factor that distinguishes them. The unit mass of the atomic nucleus is very huge. The reason why universal gravitation is weak is Because the distance between atomic nuclei in the macroscopic world is also very huge, the limitation of the number of atomic nuclei in unit space causes the universal gravitation to be much weaker than the strong force.