Re: one way light speed


<mluttgens@xxxxxxxxxx> wrote in message news:1163002912.549451.235850@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Tom Roberts wrote:
mluttgens@xxxxxxxxxx wrote:
Not at all -- observing the CMBR (and one's velocity relative to its
dipole=0 frame) is not any sort of measurement of the speed of light.

Indeed, one measures the Earth's velocity via the Doppler effect.
But this implies that the velocity relative to the Earth of the light
emitted by the CMBR is not c, but c-v or c+v.

No, it does not imply that at all! You need to MEASURE it. Certainly
measurements of the speed of light from distant stars is c, and there's
no reason at all to suspect that a measurement of the CMBR velocity
would not be c. But AFAIK such a measurement has not been done (it would
be very difficult).

If you look at the the relativistic Doppler formula,
you will see that the observed frequency NuO is linked to
the emitted frequency Nu by
NuO/Nu = sqrt(1-v^2/c^2) / (1+vr/c),
where vr is the component of v along the direction from O to S.
In the case of the Earth and the CMBR, one has
NuO/Nu = sqrt(1-v^2/c^2) / [(c +- v)/c].
One could as well use the classical Doppler, as v, the Earth velocity,
is small. The important thing is that the formula contains
c +- v, which can be interpreted in terms of a light speed anisotropy.

Marcel Luttgens

Marcel, you are an absolute imbecile, and the worst part of it is
that you know it.

Dirk Vdm


.

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