存在绝对背景的相对论时空

IIncorporating the most solid part of the physics in Einstein's theory of relativity, a nontrivial space-time physical picture, which has a slight different from the standard one, is introduced by means of making a further distinction on the space-time background and space-time scales. In this picture, the coordinate scales in gravity geometrized metric is defined by the clock and ruler equipped by the observer. So the coordinate time interval of any two events is measured by mathematical clocks and mathematical rulers, which are duplicated according to the observer's own clock and ruler. In contrast, the proper time interval in gravity geometrized metric is measured by the local proper clock. In principle, the reading number of clocks and rulers are counted by the undergone times of unit proper event intervals. However, the coordinate space-time scale is essentially described by the length of a line segment which is cut from the background of space by the unit proper space-time event intervals. The function of gravity is that the length of the unit proper event intervals is responsible to be changed according to the intensity of gravity. Such a physical picture combines both the intuitive experience and the most solid part of the physics in Einstein's theory of space-time. On this basis, we reformulate a particle dynamical equation which satisfies a more realistic general principle of relativity under the framework of classical mechanics. After that, we discuss the physical picture of the solar gravity being geometrized, and reinterpret the gravitational redshift effect. Finally, we reexamine the form of cosmological space-time metric on which the gravity at the large scale of the universe is geometrized. Since the observer is always related to the unit scales of the coordinates system in the presented space-time physical picture, the current measured cosmic acceleration is substantially a coordinate acceleration, rather than a proper acceleration which is only regarded to be measured by local clocks.