Re: About GR (kst)



Daryl McCullough wrote:
> Ken S. Tucker says...
>
> >Daryl McCullough wrote:
> >> Ken S. Tucker says...
> >>
> >> >Daryl McCullough wrote:
>
> >> >> T_00 = mass density
> >> >> all other components are negligible
> >> >
> >> >Yes, that's the usual.
> >>
> >> Well, that implies G_uv = 0 in the vacuum of space.
> >
> >1) Density (T_00) depends on volume what is the
> >correct volume? and why?
>
> Yes, the volume element (and therefore the components of T_uv)
> depend on what coordinate system you are using. But it doesn't
> matter. We're talking about *vacuum*. In the vacuum of space,
> T_uv = 0, no matter what coordinate system you use.
>
> All components of G_uv are equal to zero in outer space,
> to the accuracy that they can be measured.
>
> >2) Since the astronauts are measuring the spaceship
> >deformation should G_00 depend upon, the structure
> >composed of Pb (Lead) or Fe (Iron), which have
> >different densities.
>
> We're talking about *vacuum*. There is no lead. There
> is no iron. There is no oxygen. T_uv = 0 if you are
> in space. G_uv = 0 (to the accuracy that it can be measured).

You have succeeded in taking a subtle argument
and converting into a Fred Flintstone approach,
by ignoring everything important...have fun!

.

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