Einstein was not an inventor. He did not invent anything specific, but his discoveries and theories guided future generations to complete many inventions that were enough to change the course of history.
Einstein founded the special theory of relativity in 1905 and the general theory of relativity in 1915.
In 1905, Einstein proposed the light quantum hypothesis, which solved the problem of the photoelectric effect. From a new height, Einstein clarified the essence of the law of the immortality of matter and the law of conservation of energy, and pointed out that one of the two laws The close relationship between them has given mankind a deeper understanding of nature.
When Einstein proposed the theory of relativity, he introduced the cosmological constant (in order to explain the existence of a static universe with non-zero matter density) in the gravitational field equation, which is proportional to the metric tensor. Represented by the symbol Λ
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A long time has passed since the establishment of the special theory of relativity and the general theory of relativity. It has withstood the test of practice and history and is generally accepted by people. The theory of relativity has a huge impact on the development of modern physics and the development of modern human thought. The theory of relativity unifies classical physics logically and makes classical physics a perfect scientific system. Unified the two systems of Newtonian mechanics and Maxwell's electrodynamics on the basis of the principle of relativity, and pointed out that they both obey the principle of special relativity and are covariant to the Lorentz transformation. Newtonian mechanics is just a good way for objects to move at low speeds. Approximate laws.
The general theory of relativity establishes the relationship between the local inertial length and the universal reference coefficient through the equivalence principle, and obtains the general covariance of all physical laws. form, and established a generalized covariant theory of gravity, while Newton's gravity theory was only its first-level approximation. This fundamentally solved the problem of previous physics being limited to inertial systems, and provided a logical arrangement for the theory of relativity. It strictly examines the basic concepts of physics such as time, space, matter and motion, and provides a scientific and systematic view of time, space and matter, thus making physics a logically perfect scientific system.
The special theory of relativity gives the laws of motion of objects moving at high speeds, and suggests that mass and energy are equivalent, and provides the mass-energy relationship. These two results are not obvious for macroscopic objects moving at low speeds, but they are useful in studying microscopic particles. However, it shows extreme importance. Because the speed of microscopic particles is generally relatively fast, and some are close to or even reach the speed of light, the physics of particles is inseparable from the theory of relativity. It is not only created for the establishment and development of quantum theory. It provides the necessary conditions and provides a basis for the development and application of nuclear physics.
Reference: Baidu Encyclopedia - Einstein