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DOI：http://dx.doi.org/10.26855/jamc.2022.09.002

# Two Postulates of Special Relativity—Relativity Principle and Invariance Principle of Light Speed

Date: July 14,2022 |Hits: 581 Download PDF How to cite this paper

Haijun Liu

Shanxi Chemical Research Institute, Taiyuan, Shanxi Province, 030021, China.

*Corresponding author: Haijun Liu

### Abstract

With the two hypotheses of special relativity, the principle of relativity and the principle of invariance of the speed of light, as the main line, according to Einstein’s statement of “the length of the bar in the static system” and “the length of the bar in the dynamic system”, the concept of “the length of the distance between two points in the static system” and “the length of the distance between two points in the dynamic system” is introduced. It is pointed out that “the length of the distance between two points in the dynamic system” is a little longer than “the length of the distance between two points in the static system”, and “the length of the distance between two points in the static system” is a little shorter than “the length of the distance between two points in the dynamic system”. The relation between the length of the distance between two points in a dynamic system and the contraction factor (σ) = the length of the distance between two points in a static system. Then the concepts of “the time between two points in static system” and “the time between two points in dynamic system” are put forward. As in the case of length, the time between two points in a moving frame is a little longer than the time between two points in a stationary frame, and the time between two points in a stationary frame is a little shorter than the time between two points in a moving frame. Furthermore, it is deduced that the Lorentz transformation is not valid. It is pointed out that the forward and contravariant lorentz transformations must be corresponding line segments in the dynamic and static systems between two points. The result is inconsistent with the Lorentz transformation, so the relativity principle of special relativity is not valid. It is pointed out that motion does not cause any change in the length and time of spacetime. Galilean transformation of Newtonian mechanics is correct, and Lorentz transformation of special relativity is wrong. All kinds of errors in the derivation of γ coefficient in special relativity are pointed out. It points out various errors in the formula of lorentz velocity transformation in special relativity. The final formula of lorentz transformation of special relativity and its forward and inverse transformation are presented.

### References

 Einstein, Translated by Yang Runyin. (2019). Special and General Theory of Relativity: A Brief Introduction [M]. Beijing: Peking University Press, 2019, 1-32, 109-115, 209-228. (in Chinese)

 Einstein, Translated by Fan Dainian, et al. (2017). The Collected Works of Albert Einstein (Supplement): Volume 2 [M]. Beijing: The Commercial Press, 2017, 92-126. (in Chinese)

 Liao Liu. (2019). Special Relativity (Second Edition) [M]. Beijing: Science Press, 2019, 12-21. (in Chinese)

### How to cite this paper

Two Postulates of Special Relativity—Relativity Principle and Invariance Principle of Light Speed

How to cite this paper:  Haijun Liu. (2022) Two Postulates of Special Relativity—Relativity Principle and Invariance Principle of Light Speed. Journal of Applied Mathematics and Computation6(3), 282-289.

DOI: http://dx.doi.org/10.26855/jamc.2022.09.002

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