In article <email@example.com>, Pentcho Valev <firstname.lastname@example.org> wrote:
> http://www.livescience.com/38511-speed-light-einstein-tested.html > "The speed of light is considered to be the ultimate cosmic speed limit, > thanks to Einstein's special theory of relativity. But physicists aren't > content to assume this limit without testing it." > > Einstein's 1905 light postulate says that the speed of light is independent > of the speed of the emitter. This, combined with the principle of relativity, > validly leads to the conclusion that the speed of light (relative to the > observer) is independent of the speed of the observer as well. This > conclusion has been tested countless times (Doppler effect, stationary > source, moving observer) and the result is straightforward: the conclusion is > false, that is, the speed of light (relative to the observer) does depend on > the speed of the observer. > > In order to detract the attention from this and other failures of special > relativity, Einsteinians have devised the ultimate-cosmic-speed-limit red > herring. "Nothing can move faster than light according to special relativity" > is the mantra, although there seems to be no valid deduction of "nothing can > move faster than light" from Einstein's 1905 two postulates. Needless to say, > Einsteinians have also wasted billions and billions in experiments gloriously > showing that "nothing can move faster than light". > > Pentcho Valev
The speed of any electromagnetic wave (such as light) is determined by two things:
1. The electrical characteristics of the media in which it is traveling.
2. The magnetic characteristics of the media in which it is traveling.
The electrical parameter is "Permittivity" and the magnetic parameter is "permeability."
The speed is equal to one over the square root of the product of permittivity and permeability.
The permittivity and permeability of a vacuum are well known. These are constants. Therefore c (speed of light in a vacuum) is a constant.
If you have some evidence that either the permittivity or the permeability is not constant, please show us here.