This is an intersting article and one which keeps alive an esoteric topic of physics which is of interest to a wide public, most of whom have no real chance of understanding it, but are pleased to have someone explain it to them and the history of it as has been done here.
Well done. However, I do not believe that the demonstrated absence of the aether played any role in the definition of the photon. This followed fairly slowly in fact and was contentious right up to the s when semi-classical physics was still a topic of much serious theoretical research — with some considerable success in some areas. Theoretically there are an infinite number of such stationary frames moving relative to each other in every conceivable direction at every possible speed simultaneously.
Thus, there are an infinite number of different manifestations of the same expanding light sphere 7 moving in every conceivable direction at every conceivable speed simultaneously. In plain words, if the light propagates from a point that is stationary within each of the different choices of stationary frames, and each of these frames is in motion relative to the other frames, then the different propagation points with their respective expanding light spheres are also in motion relative to each other.
Subsequently, there will be an infinite number of expanding light propagation spheres moving in every conceivable direction at every possible speed simultaneously for the same pulse of light. This is the reality of light not taking on the speed of the source in the absence of a medium, or even in the presence of a medium if the medium travels along with the observation frame. The Millennium Relativity Light Spheres. Fortunately, it is not necessary to relate the light propagation sphere observed in the frame of the source to every one of the infinite number of spheres replicated in the infinite number of different stationary frames.
Unless refuted by new forthcoming evidence we can visualize these different renditions as induced spheres or simply as the same sphere being observed under the different conditions of the frame it is observed in. In either case, only one of these renderings is observed in each of the different frames. More specifically, we can only observe the version of the sphere that is propagating from a point that is stationary relative to the frame of the observer.
Interestingly, this means that two observers on Earth who are in motion relative to each other will observe the light from a moving source such as a star from an expanding sphere that is slightly different for each observer.
Given the speed of light relative to the kind of motion that might normally take place between two such observers, however, the differences between their different propagation spheres would be negligible and therefore normally undetectable. It then becomes clear that the Lorentz transformations are not required to reconcile an undetected effect with respect to the direction of motion through space, but rather to reconcile the differences between the propagation spheres observed in the two different inertial frames source and stationary under the condition that light has the same speed c in each frame.
Referring now to Figure 1, there is one remaining issue to be discussed. In the diagram shown, a moving light source traveling to the right at a uniform rate of speed v during stationary frame time interval T emits a pulse of light at point A in the stationary frame of reference. Since light does not take on the speed of the source, the pulse emitted at point A stays centered over point A as it propagates outward from that point in all directions at speed c. This results in an expanding light sphere that reaches the size illustrated by sphere S 1 at the instant the source reaches point B in that same stationary frame.
This representation of the sphere is shown in the diagram as sphere S 2. Since, according to the evidence, light has a constant speed c in all inertial systems, these two paths of travel can be used to determine time and distance in the moving frame of the source relative to time and distance in the stationary frame. Go to case. Encyclopedia of Cleveland History. Article Categories. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
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