Is Einstein's principle of constancy of the speed of lightexperimentally disproved?

Yes it is. The Doppler frequency shift can be regarded as a firmly established experimental fact, and I am going to show that "shift in frequency" is equivalent to "shift in the speed of light".

A light source emits a series of pulses the distance between which is d (e.g. d=300000km). A stationary observer/receiver measures the frequency of the pulses to be f=c/d:

http://www.einstein-online.info/imag...ler_static.gif

An observer/receiver moving with speed v (let v be small so that the relativistic corrections can be ignored) towards the light source measures the frequency of the pulses to be f'=(c+v)/d:

http://www.einstein-online.info/imag...ector_blue.gif

From the formula f=c/d one infers that the speed of the light pulses relative to the stationary observer/receiver is c. From the formula f'=(c+v)/d one infers that the speed of the light pulses relative to the moving observer/receiver is c'=c+v, in violation of special relativity.

In other words: As the observer starts moving towards the light source with speed v, the speed of the light pulses relative to him shifts from c to c'=c+v (in violation of special relativity) and, as a result, the frequency the observer measures shifts from f=c/d to f'=(c+v)/d:

http://www.youtube.com/watch?v=bg7O4rtlwEE
"Doppler effect - when an observer moves towards a stationary source. ...the velocity of the wave relative to the observer is faster than that when it is still."

As the observer starts moving away from the light source with speed v, the speed of the light pulses relative to him shifts from c to c'=c-v (in violation of special relativity) and, as a result, the frequency the observer measures shifts from f=c/d to f'=(c-v)/d:

http://www.youtube.com/watch?v=SC0Q6-xt-Xs
"Doppler effect - when an observer moves away from a stationary source. ....the velocity of the wave relative to the observer is slower than that when it is still."

http://www.einstein-online.info/spotlights/doppler
Albert Einstein Institute: "The frequency of a wave-like signal - such as sound or light - depends on the movement of the sender and of the receiver. This is known as the Doppler effect. (...) Here is an animation of the receiver moving towards the source: (...) By observing the two indicator lights, you can see for yourself that, once more, there is a blue-shift - the pulse frequency measured at the receiver is somewhat higher than the frequency with which the pulses are sent out. This time, the distances between subsequent pulses are not affected, but still there is a frequency shift: As the receiver moves towards each pulse, the time until pulse and receiver meet up is shortened. In this particular animation, which has the receiver moving towards the source at one third the speed of the pulses themselves, four pulses are received in the time it takes the source to emit three pulses."

Let "the distance between subsequent pulses" be 300000 km. Then the frequency measured by the stationary receiver is f = 1 s^(-1) and that measured by the moving receiver is f' = 4/3 s^(-1). Accordingly, the speed of the pulses relative to the moving receiver is:

c' = (4/3)c = 400000 km/s

in violation of special relativity.

The relativistic corrections change essentially nothing. The speed of the receiver is (1/3)c so gamma is 1.05. Accordingly, the corrected f' is (1.05)*(4/3) s^(-1) and the corrected c' is (1.05)*(400000) km/s. Special relativity remains violated.

Pentcho Valev

The following confession is staggering:

http://philsci-archive.pitt.edu/1743/2/Norton.pdf
John Norton: "In addition to his work as editor of the Einstein papers in finding source material, Stachel assembled the many small clues that reveal Einstein's serious consideration of an emission theory of light; and he gave us the crucial insight that Einstein regarded the Michelson-Morley experiment as evidence for the principle of relativity, whereas later writers almost universally use it as support for the light postulate of special relativity. Even today, this point needs emphasis. The Michelson-Morley experiment is fully compatible with an emission theory of light that contradicts the light postulate."

That is, the Michelson-Morley experiment confirms a theory that contradicts Einstein's 1905 constant-speed-of-light postulate. According to Stachel and Norton, Einstein teaches the truth (the experiment confirms the principle of relativity but not the principle of constancy of the speed of light) while Einstein's followers "almost universally" teach the blatant lie (the experiment confirms the principle of constancy of the speed of light). What kind of world is that?

The nightmare (for Einstein's followers) is that, in the absence of idiotic additional (ad hoc) hypotheses such as length contraction, the Michelson-Morley experiment does indeed refute the assumption that the speed of light is independent of the speed of the light source (Einstein's 1905 constant-speed-of-light postulate):

http://www.marxists.org/reference/su...r/poincare.htm
Henri Poincaré: "Lorentz could have accounted for the facts by supposing that the velocity of light is greater in the direction of the earth's motion than in the perpendicular direction. He preferred to admit that the velocity is the same in the two directions, but that bodies are smaller in the former than in the latter."

http://books.google.com/books?id=JokgnS1JtmMC
"Relativity and Its Roots", Banesh Hoffmann, p.92: "Moreover, if light consists of particles, as Einstein had suggested in his paper submitted just thirteen weeks before this one, the second principle seems absurd: A stone thrown from a speeding train can do far more damage than one thrown from a train at rest; the speed of the particle is not independent of the motion of the object emitting it. And if we take light to consist of particles and assume that these particles obey Newton's laws, they will conform to Newtonian relativity and thus automatically account for the null result of the Michelson-Morley experiment without recourse to contracting lengths, local time, or Lorentz transformations. Yet, as we have seen, Einstein resisted the temptation to account for the null result in terms of particles of light and simple, familiar Newtonian ideas, and introduced as his second postulate something that was more or less obvious when thought of in terms of waves in an ether."

Did Einstein really teach the truth? Of course not. He was the author of the blatant lie:

http://query.nytimes.com/gst/abstrac...66838A 639EDE
The New York Times, April 19, 1921: "The special relativity arose from the question of whether light had an invariable velocity in free space, he [Einstein] said. The velocity of light could only be measured relative to a body or a co-ordinate system. He sketched a co-ordinate system K to which light had a velocity C. Whether the system was in motion or not was the fundamental principle. This has been developed through the researches of Maxwell and Lorentz, the principle of the constancy of the velocity of light having been based on many of their experiments. But did it hold for only one system? he asked. He gave the example of a street and a vehicle moving on that street. If the velocity of light was C for the street was it also C for the vehicle? If a second co-ordinate system K was introduced, moving with the velocity V, did light have the velocity of C here? When the light traveled the system moved with it, so it would appear that light moved slower and the principle apparently did not hold. Many famous experiments had been made on this point. Michelson showed that relative to the moving co-ordinate system K1, the light traveled with the same velocity as relative to K, which is contrary to the above observation. How could this be reconciled? Professor Einstein asked."

Pentcho Valev