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From: John Jones on 29 Apr 2010 09:51
Pentcho Valev wrote:
> http://www.physlink.com/Education/AskExperts/ae13.cfm
> "So, it is absolutely true that the speed of light is not constant in
> a gravitational field [which, by the equivalence principle, applies as
> well to accelerating (non-inertial) frames of reference]. If this were
> not so, there would be no bending of light by the gravitational field
> of stars....Indeed, this is exactly how Einstein did the calculation
> in: 'On the Influence of Gravitation on the Propagation of Light,'
> Annalen der Physik, 35, 1911. which predated the full formal
> development of general relativity by about four years. This paper is
> widely available in English. You can find a copy beginning on page 99
> of the Dover book 'The Principle of Relativity.' You will find in
> section 3 of that paper, Einstein's derivation of the (variable) speed
> of light in a gravitational potential, eqn (3). The result is,
> c' = c0 ( 1 + V / c^2 )
> where V is the gravitational potential relative to the point where the
> speed of light c0 is measured."
>
> THEOREM 1: The speed of light obeys the equation c'=c(1+V/c^2) if and
> only if, in the absence of a gravitational field, it obeys the
> equation c'=c+v where v is the speed of the emitter relative to the
> observer.
>
> Both equations belong to Newton's emission theory of light and
> contradict Einstein's 1905 light postulate:
>
> http://www.fourmilab.ch/etexts/einstein/specrel/www/ "...light is
> always propagated in empty space with a definite velocity c which is
> independent of the state of motion of the emitting body."
>
> THEOREM 2 (The Redshift Law): If the assumption that the wavelength of
> light varies with the speed of the observer is absurd, then the
> following unversal equation holds:
>
> f'/f = c'/c
>
> where f' is the shifted frequency of light (at the moment of
> reception), f is the original frequency (at the moment of emission),
> c' is the speed of light relative to the observer (at the moment of
> reception), c is the speed of light relative to the emitter (at the
> moment of emission).
>
> Pentcho Valev
> pvalev(a)yahoo.com
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