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From: "Paul.B.Andersen" <relativity@paulba.no>
Newsgroups: sci.physics,sci.physics.relativity
Subject: Re: What is a photon
Date: Tue, 10 Jun 2025 20:59:05 +0200
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Den 05.06.2025 13:51, skrev bertitaylor:
> On Wed, 4 Jun 2025 12:32:19 +0000, Paul.B.Andersen wrote:
> 
>> Maybe you don't know what invariant means?

> 
> Invariant means that the speed does not depend upon the speed of the
> emitter, in this case.

Invariant means that the speed of light in vacuum
is the same in all inertial frames of reference.

The speed of a wave in a medium (air, water, eather) is not invariant.

Many experiments have confirmed the invariance of the speed of light,
and no experiment have shown otherwise.

A few of them:

https://paulba.no/paper/Kennedy_Thorndike.pdf
https://paulba.no/paper/Michelson_1913.pdf
https://paulba.no/paper/Alvager_et_al.pdf
https://paulba.no/paper/Babcock_Bergman.pdf
https://paulba.no/paper/Brecher.pdf

Light is not a wave in an aether.

> Actually it does, as redshift and blueshift shows, and the Doppler radar
> effect.

It would be interesting to see the math that shows that
Doppler shift of EM-radiation implies that the speed of light
is different in different inertial frames.

But we won't see that, will we? :-d

> However we cannot find the speed of the moving Earth (or aether drift as
> they called it) as it is just not possible. The light speed variance
> nicely cuts out the extra plus or minus distances travelled.

In other words, it is impossible to find the speed of the Earth
in the aether because the speed of light is invariant, and light
isn't a wave in an aether.

> 
> This is rather subtle, so requires some deep thinking.

What does "deep thinking" mean? Is it logical thinking?
Can you show the logic that show that it is impossible
to measure the speed of the Earth in the aether?


-- 
Paul

https://paulba.no/