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OPTICAL VIEWPOINT. “In fact, in the more than 100 years since the birth of general relativity, a few scholars have tried to treat four-dimensional space-time as a special material or medium and use optical methods to deal with the problems of relativity.” https://lnkd.in/dATr5iE7 View in LinkedIn

ETHER REVIVED. “In other words, space is here considered as a special kind of medium.” https://lnkd.in/dATr5iE7 View in LinkedIn

HIDDEN MEANING. “This paper tries to reveal this meaning by studying the composition of space. It should be pointed out that the space in this paper is not Newton's absolute space, but the relativistic space defined by the space-time metric. This means that the space here is not isotropic rigid space, but an elastic space that can be deformed, i.e. a dimensionally reduced expression of the four-dimensional space-time.” https://lnkd.in/dATr5iE7 View in LinkedIn

UNORTHODOX THINKING. “The formulas of relativistic clock difference and gravitational redshift for Schwarzschild metric may be obtained by using space-time ruler. Although these methods may appear unrelated to current mainstream theories, they lead to right results. This suggests that there is some deeper meaning hidden in the concepts of space-time ruler and refractive index.” https://lnkd.in/dATr5iE7 View in LinkedIn

SPACE-TIME ELASTICITY. “In addition, we have also introduced space-time ruler according to the time-space metric. Space-time ruler is an elastic rubber-like object, and its elastic deformation coefficient is related to the relative motion speed and the position of the gravitational field.” https://lnkd.in/dATr5iE7 View in LinkedIn

CONSEQUENCES OF NEW THEORY. “Using these concepts, the equivalence principle is understood in a coherent way, and the quantitative description of perihelion precession, gravitational deflection of light and Shapiro time delay are obtained for Schwarzschild metric.” https://lnkd.in/dATr5iE7 View in LinkedIn

NEW THEORY. “According to the observer's position, the gravitational field refraction index is divided into local gravitational field refractive index and non-local gravitational field refractive index.” https://lnkd.in/dATr5iE7 View in LinkedIn

MODERN SPECULATION. “The present authors continued and developed Einstein's views on aether. In a previous series of articles, we have introduced the relative motion refractive index and the gravitational field refractive index using the space-time metric of special relativity and general relativity respectively.” https://lnkd.in/dATr5iE7 View in LinkedIn

ABHORS A VACUUM. “At present, there is a consensus that space is not empty.” https://lnkd.in/dATr5iE7 View in LinkedIn

FUDGE FACTORS. “In order to explain these phenomena, the concepts of dark matter, and later dark energy, have been introduced. These concepts, like the aether, express our ignorance about the nature of space.” https://lnkd.in/dATr5iE7 View in LinkedIn