Can anyone give an opinion on Einstein s Special Theory of Relativity .

1. The research objects are different.

Special relativity is mainly the relationship between time and space, that is, the relationship between time and space in the frame of reference of relative velocities. For example, in another frame of reference that moves at close to the speed of light relative to the reference frame, the time will be relatively longer and the distance will be shorter.

General relativity deals primarily with the equivalence of gravity and acceleration, involving space-time distortions.

2. The publication time is different.

The special theory of relativity is a new theory of straight space-time proposed by Albert Einstein in 1905 entitled "On the Electrodynamics of Moving Bodies", which is different from Newton's view of space-time.

General relativity is a theory that describes the gravitational interaction between matter. Its basis is AEinstein completed it in 1915 and officially published it in 1916.

3. The background time and space are different when using.

The background space-time of the special theory of relativity is straight, that is, the four-dimensional trivial manifold is matched with the Min's gauge, and its curvature tensor is zero, also known as the Min's space-time; The background space-time of general relativity, on the other hand, is curved, and its curvature tensor is non-zero.

Einstein's theory of general relativity is the study of the acceleration of objects relative to their surroundings, especially those that were previously thought to be caused by "gravitational" effects. The general theory of relativity explains gravity as the curvature of space-time. According to this theory, the orbit of a planet around a star, the hyperbolic path that a comet travels is not due to the "action" of gravity, but to the distortion of space caused by the mass of the star.

Einstein was inspired by what he later called "the happiest thought of my life, that if a person falls freely, he will not perceive his own quality." The important idea is the oneness of space and time, which in his special theory of relativity is already related, not straight, but curved, bent by the matter that exists. Einstein recognized that this curvature would lead to a phenomenon known as gravity.

Newton believed that gravity was the force by which objects attract each other, and although his equations were perfect, he would often be careful to say that he did not know what this strange force acting on distant objects was. General relativity solves this problem. There is no force, the object simply moves along the shortest path in space-time.

On a flat surface, the shortest path is a straight line, also known as a geodesic. On a spherical surface like the Earth, a geodesic is an arc on a circle. But in complex curved space-time, the geodesic line that an object follows may be an ellipse or hyperbola, or any path described by Newton's theory of gravity.

In fact, there is no such thing as gravity at all: as the American physicist John Wheeler summed it up, "space tells matter how it moves, and matter tells how it bends".

In fact, once Einstein mastered the subtle mathematical tools to describe his four-dimensional surfaces, the theory of relativity, like Newton's equations in the 17th century, made everything clear, except for a few extreme cases. These cases include extremely massive things, where space-time is so bent that Newton's equations cannot be true. Albert Einstein realized that this difference was visible in the orbit of Mercury.

Astronomers made long-term observations of the tiny planet, which was very close to the Sun, and found that its orbit was constantly changing, a movement that could not be explained in classical gravitational theory. But according to relativity, this additional curvature of space due to its proximity to the Sun warps Mercury's orbit exactly what it is today.

A few years later, Einstein extended the field equations of general relativity to cosmology, and to his dismay, the equations predicted a dynamic universe in which the universe would expand or contract, rather than be static, as the scientific community generally believes. So Einstein introduced a force that he called the cosmological constant, so that his equations could give the results of a static universe. "It was the biggest mistake I ever made in my life," he later recalled.

Soon after, astronomers discovered that the universe was indeed expanding and that the theory of relativity was correct throughout.

What exactly is Einstein's theory of general relativity?

Einstein's general theory of relativity can be expressed in the following words: space-time tells matter how it moves; Matter tells how space-time is bent.

General relativity is a theory that describes the gravitational interaction between matter based on the distortion of space. The core idea of general relativity is that any object with mass will cause space-time to bend, and the object will do inertial motion in this curved space-time.

General relativity describes the nature of gravity, which means that gravity does not exist, but is only an effect of the curvature of space-time. In the explanation of the American physicist John Wheeler, Einstein's geometric theory of gravity can be summarized as follows: space-time tells matter how to move, and matter tells space-time how to bend.

In other words, gravity is only an external manifestation of space-time bending, and the movement of matter is affected by gravity, which is actually only an effect caused by space-time bending.