🚀 go-pugleaf

On Jan 14, 7:17 am, Pentcho Valev <pva...@yahoo.com> wrote:
> http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/speed_o...
> Steve Carlip: "Einstein went on to discover a more general theory of
> relativity which explained gravity in terms of curved spacetime, and
> he talked about the speed of light changing in this new theory.  In
> the 1920 book "Relativity: the special and general theory" he wrote:
> ". . . according to the general theory of relativity, the law of the
> constancy of the velocity of light in vacuo, which constitutes one of
> the two fundamental assumptions in the special theory of relativity
> [. . .] cannot claim any unlimited validity.  A curvature of rays of
> light can only take place when the velocity of propagation of light
> varies with position."  Since Einstein talks of velocity (a vector
> quantity: speed with direction) rather than speed alone, it is not
> clear that he meant the speed will change, but the reference to
> special relativity suggests that he did mean so.  THIS INTERPRETATION
> IS PERFECTLY VALID AND MAKES GOOD PHYSICAL SENSE, BUT A MORE MODERN
> INTERPRETATION IS THAT THE SPEED OF LIGHT IS CONSTANT in general
> relativity."
>
> http://www.fordham.edu/halsall/source/loyola-spirex.html
> Ignatius of Loyola: "To be right in everything, we ought always to
> hold that THE WHITE WHICH I SEE, IS BLACK, if the Hierarchical Church
> so decides it...."
>
> Pentcho Valev
> pva...@yahoo.com

Speed of light measured at a distance need not be c in GR. This is an
old hat (ca. 1916) which apparently brought you a headache (unlike the
hat in Meyrink's "Golem").

--
Jan Bielawski