🚀 go-pugleaf

On Oct 29, 6:00 pm, shay...@yahoo.com wrote:
> On Oct 29, 12:09 am, Pentcho Valev <pva...@yahoo.com> wrote:
>
> > ...you will have to give a straightforward answer to
> > the following question: Are the "strongest validations of GR"
> > consistent with Einstein's 1911 equation c'=c(1+V/c^2) or are they
> > consistent with Einstein's final equation c'=c(1+2V/c^2)?
>
> This was already answered last week. Here's the answer again.
>
> On Oct 24, 12:20 am, Pentcho Valev <pva...@yahoo.com> wrote:
>
> > The speed of light varies with the gravitational potential V and
> > Einstein has given two respective equations: c'=c(1+V/c^2), Einstein's
> > 1911 equation, and c'=c(1+2V/c^2), his final decision.
>
> The link you cited clearly explains that, in the completed theory of
> general relativity, when expressed in terms of Schwarzschild
> coordinates near a spherically symmetrical mass, the speed of light
> is
> 1 + 2V in the radial direction and 1 + V in the tangential direction.
>
> In 1911 Einstein was working on a theory with a scalar potential that
> gave a speed of light that depended only on position, given by 1 + V,
> but
> by 1915 he had realized this doesn't work. It's necessary for the
> speed
> of light to depend not just on the location, but also on the
> direction.
> This means instead of a "scalar potential" he needed a "tensor
> potential".
> It so happens that the scalar formula he gave in 1911 was correct for
> the tangential direction, but not for the radial direction.
>
> > Both hypnotists and zombies in Einstein criminal cult should stop
> > repeating "Not variable locally" (a rather silly red herring)...
>
> That isn't exactly a "red herring", it's just stated rather sloppily.
> The point is that, in general relativity, the coordinate system can
> be
> chosen arbitrarily (the field equations are generally covariant), so
> the "speed of light" depends on the choice of coordinate system. This
> is also true in special relativity, but in that case there is a
> natural "best" choice of coordinate systems, namely, the inertial
> coordinate systems, and in terms of those coordinates the speed of
> light is always c.  In general relativity there is no longer a
> natural
> best choice of coordinate systems, because it isn't possible to
> define
> a global inertial coordinate system (due to the curvature of
> spacetime). It's like trying to define a Cartesian coordinate system
> over the whole surface of the Earth. So we have to use some other
> coordinate systems, like Schwarzschild coordinates, in terms of which
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no need for Schwarzschild coordinate system
in the above example

the Polar system is good enough  !!!!

ATB
Y.Porat
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