Gravity |
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According to Einstein: Without the influence of forces, masses move on geodesics* in a curved manifold. Since in a single-body system, planets, satellites, or light take different paths from the same point and direction, this only makes sense if time is added to the space, and means curved spacetime. In a gravitational field, the trajectory of a small, massive object free of force is thus determined solely by its instantaneous velocity and direction. *A. Einstein: Grundzüge der Relativitätstheorie (Page 78, 79) In the Snow Globe Theory: If you don't look out the window in a subway, only the accelerating forces are noticeable, not the velocity. A force appears to act on masses. Seen from the outside, however, it is only inertia, hence the name "apparent forces." Acceleration changes the velocity. The locations the trajectory passed are now distant. According to the STR, this results in a change in the spatial and temporal scales for these locations. Inside the subway, no scale changes. From the outside, of course, the opposite is true. Distance from a central star does not change the subway's speed. However, the speed of light, observed from a different distance, does change. This is the system speed of spacetime and not a special property of light. Locally, at any given point (at rest), no change in scale is noticeable, only the distance and/or a different speed. Difference: For Einstein, spacetime curves under the influence of masses. In the snow globe theory, there is no ether, nor spacetime as ether. Spacetime is the distance energy of masses and particles relative to each other. Euclidean and pseudo-Euclidean spaces are real in mathematics, not in the physical world. Ludwig Resch |