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Newsgroups: sci.physics.relativity
Subject: Re: The failure of the unified field theory means general relativity fails.
From: nospam@de-ster.demon.nl (J. J. Lodder)
Reply-To: jjlxa31@xs4all.nl (J. J. Lodder)
Date: Sun, 23 Jun 2024 10:48:47 +0200
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Tom Roberts <tjoberts137@sbcglobal.net> wrote:

> On 6/22/24 9:54 PM, LaurenceClarkCrossen wrote:
> > Paul Anderson, thanks for the pdf. Your formula employs the
> > electromagnetic assumption that gravity moves at the speed of light.
> 
> You got this backwards. In GR, changes in gravity propagate at the local
> symmetry speed, given by SPECIAL Relativity. It "just so happens" [#]
> that electromagnetic waves travel at this same speed in vacuum. It is
> merely an historical anomaly that it is called "the speed of light", due
> to the round-about way Einstein first described relativity in 1905 --
> the spacetime symmetry is MUCH more fundamental and important.
> 
>   [#] This is neither happenstance nor accident....
> 
> BTW modern derivations of SR don't use electromagnetism at all.
> 
> > Your formula (1) has c^2 and it is clearly not 1^2, and is in m/s,
> > contrary to Lodder. 
> 
> Nope. YOU have imposed specific units onto the formula/equation. The 
> equation itself does not impose any particular units on its variables
> and constants [@], it merely requires that they be self-consistent.
> 
>   [@] There are many systems of units in common use. You
>   seem to think there is only one.

A forteriori, any result that depends on any particular choice
of units (or dimensions) is unphysical.
Despite the obviousness and triviality of this
some people have found it necessary to give it a name,
and called it 'Bridgman's Axiom'.

Jan