[ATM] Re: Quasar lightspeed

["Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>]

Tommy,

Why would the speed of light not change on its way through spacer/time
towards us?
I can imagine that the laws of nature, and hence its constants like the
speed of light, actually depends on the state of the universe, and that it
is/was different in the place/time of the quasars. But why would the speed
of the light that is finally arriving here and now be different from any
other light?
Please explain, so I can understand your experiment.

/Arjan te Marvelde

> What we are trying to do is measure the speed of redshifted (quasar)
light.
>
> Why?  Because there is an old version of General Relativity (de Sitter)
for
> which light is both redshifted and slowed at large distances.  We think
> this version has been overlooked, and we wish to test it against the
> Standard Model.  The quasar lightspeed measurement is the best way we can
> think of to differentiate these two theories, to make a test with an
> observable that clearly favors one or the other model.  De Sitter predicts
that
>
> (quasar lightspeed) = c/(1+z).
>
> Karl Popper would approve:  if the measured lightspeed of a quasar with
z=1
> is not half-normal, then this old version of GR (de Sitter) can't be
> correct.  We have a disprovable prediction.

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