sci.physics.particle

On 16 Mar, 20:30, BradGuth wrote:
> On Mar 16, 9:14 am, Tom Roberts wrote:
>
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> > The Speaking Clock wrote:
> > > On 15 Mar, 08:57, Pentcho Valev wrote:
> > >> [... his usual nonsense]
>
> > > Would the speed of light be a non wiggly constant at the very edge of
> > > the universe - bending around it?
>
> > The speed of light is a constant, c, for any LOCAL measurement anywhere
> > in the universe. I guess that includes "non wiggly". It also includes
> > essentially all measurements of light speed here on earth. At least that=

> > is what GR predicts, and there are no observations that contradict it.
>
> > =A0 =A0 =A0 =A0 [Ignore Valev when he brings up Pound-Rebka and similar
> > =A0 =A0 =A0 =A0 =A0experiments -- they do not measure speed.]
>
> > But if you want to see light "bending around the universe" then that
> > would certainly require a non-local path, and there's no solid
> > prediction of the result (given the uncertainties in the physical
> > situation you have in mind).
>
> > It is rather difficult to perform a non-local measurement of the speed
> > of light, but it has been done by sending radar waves across the solar
> > system to reflect back from mars and venus. By measuring the round-trip
> > delay repeatedly over several years, and fitting to the planetary
> > orbits, one can deduce the round-trip speed of light for these paths.
> > That speed varies, depending on how close to the sun the path passes;
> > look up "Shapiro time delay". The results are in excellent agreement
> > with the predictions of GR.
>
> > =A0 =A0 =A0 =A0 Some people claim this is due to the solar atmosphere.
> > =A0 =A0 =A0 =A0 They are wrong: by doing this for multiple wavelengths t=
he
> > =A0 =A0 =A0 =A0 effect of the solar atmosphere can be identified, and is=

> > =A0 =A0 =A0 =A0 found to be negligible. Of course it would be highly
> > =A0 =A0 =A0 =A0 unlikely that such a different effect could mimic the GR=

> > =A0 =A0 =A0 =A0 dependence on path. Indeed, measurements using pulsars
> > =A0 =A0 =A0 =A0 agree with the GR predictions for paths that never go
> > =A0 =A0 =A0 =A0 inside earth's orbit, and we know what the solar
> > =A0 =A0 =A0 =A0 atmosphere is out here.
>
> > Tom Roberts
>
> But photons clearly represent mass, thus the solar atmosphere of
> photons does offer mass for other passing photons to interact with.
> . - Brad Guth- Hide quoted text -
>
> - Show quoted text -

My physics friend says - "what about the underlying noise of the
universe caused by the discrete nature of the photon/s in time, and
how does that contribute to the total 1/f energy of the universe?"

And then he changed the subject because light speed and it's constant
interacting with what he talked about is something to do with space
travel and I'm a buddhist. lol. Although - this is just my surmise;)