cerhu > sci.* > sci.physique

Pentcho Valev (29/11/2018, 12h29)
"If there's one thing every schoolboy knows about Einstein and his theory of relativity, it is that the speed of light in vacuum is constant. No matter what the circumstances, light in vacuum travels at the same speed - a constant that physicists denote by the letter c: 300,000 km per second, or as Americans refer to it, 186,000 miles per second. The speed of light is the very keystone of physics, the seemingly sure foundation upon which every modern cosmological theory is built, the yardstick by which everything in theuniverse is measured. [...] The only aspect of the universe that didn't change was the speed of light. And ever since, the constancy of the speed of light has been woven into the very fabric of physics, into the way physics equations are written, even into the notation used. Nowadays, to "vary" thespeed of light is not even a swear word: It is simply not present in the vocabulary of physics." [..]

"The speaker Joao Magueijo, is a Reader in Theoretical Physics at Imperial College, London and author of Faster Than the Speed of Light: The Story of a Scientific Speculation. He opened by explaining how Einstein's theory of relativity is the foundation of every other theory in modern physics and that the assumption that the speed of light is constant is the foundation of that theory. Thus a constant speed of light is embedded in all of modern physics and to propose a varying speed of light (VSL) is worse than swearing!It is like proposing a language without vowels." [..]

"The whole of physics is predicated on the constancy of the speed of light," Joao Magueijo, a cosmologist at Imperial College London and pioneer of the theory of variable light speed, told Motherboard. "So we had to find waysto change the speed of light without wrecking the whole thing too much." [..]

The quotations above suggest that the following conditional is valid:

If the speed of light depends on the speed of the emitter, fundamental physics is long dead.

The speed of light either depends on the speed of the emitter (Newton) or is independent (Einstein). Who was right? The answer was given, implicitly, in 1887. Dependence directly confirmed. Independence, "without recourse to contracting lengths, local time, or Lorentz transformations", disproved:

Banesh Hoffmann, Relativity and Its Roots, 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. If it was so obvious, though, why did he need to state it as a principle? Because, having taken from the idea of light waves in the ether theone aspect that he needed, he declared early in his paper, to quote his own words, that "the introduction of a 'luminiferous ether' will prove to be superfluous." [..]

Wikipedia: "Emission theory, also called emitter theory or ballistic theoryof light, was a competing theory for the special theory of relativity, explaining the results of the Michelson–Morley experiment of 1887. [....] The name most often associated with emission theory is Isaac Newton. In his corpuscular theory Newton visualized light "corpuscles" being thrown off from hot bodies at a nominal speed of c with respect to the emitting object, and obeying the usual laws of Newtonian mechanics, and we then expect light to be moving towards us with a speed that is offset by the speed of the distant emitter (c ± v)." [..]


Pentcho Valev
Pentcho Valev (30/11/2018, 12h23)
In future physics, the false axiom

"The speed of light is invariable"

will be replaced with the correct one

"The wavelength is invariable"

This means that, in accordance with the formula

(frequency) = (speed of light)/(wavelength)

any registered change in frequency corresponds to a proportional change in the speed of light. In other words, the frequency, as measured by an observer, shifts because the speed of the light relative to him shifts.

Pentcho Valev
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