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FLUCTUATING FIELDS. “Later, with the development of quantum mechanics, the picture changed and the seemingly empty space is actually thought as full of all kinds of fluctuation fields.” https://lnkd.in/dATr5iE7 View in LinkedIn

OPTICAL RELATIVITY. “Eddington was probably the first person to attempt an optical approach to general relativity. On the other hand, this is not the mainstream method to address relativity problems.” https://lnkd.in/dATr5iE7 View in LinkedIn

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

ALTERNATIVES. “There could be other expressions of the Equivalence Principle respecting the spirit of General Relativity but violating maximally its usual expression.” https://lnkd.in/daA2SgMy View in LinkedIn

PROBLEM OF NEGATIVE MASS. “Still we will see that General Relativity does predict gross violations of the Equivalence Principle as soon as negative mass components are allowed.” https://lnkd.in/daA2SgMy View in LinkedIn

TWEAKING RELATIVITY. “Truly enough, as soon as we express general relativity as a metric theory, with a single metric, it is difficult to see how gravity could distinguish matter from antimatter since according to the very formalism of a single metric, all particles must follow the same trajectory.” https://lnkd.in/daA2SgMy View in LinkedIn