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Subject: Re: What is "local =?UTF-8?Q?time=22=3F?=
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Date: Wed, 16 Oct 24 13:07:58 +0000
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From: Richard Hachel <r.hachel@liscati.fr.invalid>
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Le 16/10/2024 à 11:03, Mikko a écrit :
> On 2024-10-14 11:28:45 +0000, Richard Hachel said:
> 
>> What is "local time" in relativity?
> 
> The expression is usually not used in Relativity. In particular,
> Einstein did not use it.

You may be right.
For my part, I firmly believe that a lot of words or concepts should be 
completely abandoned.
This will make many relativity lovers jump, I think, but I think it is 
"necessary for the song" and that one day, we will have to go through it.
Example of words or concepts that are TOTALLY useless, even biased.
"local time", "relativity of simultaneity by change of reference frame", 
"local present time", "hypercone of present time",
"invariance of the space-time interval", "time-gap": we don't need all of 
this.
At best, it is useless, at worst it is false.
And this is only part of the horror that misunderstood RR has become, and 
I am not even talking about uniformly accelerated media and rotating 
media.
The RR that should remain compatible is so much no longer compatible that 
we are forced to talk about RG to sweep the dust under the carpet.
The same goes for a simple Langevin in apparent speed, it is so ridiculous 
that we are forced to evade this question, and that no one except me is 
capable of drawing a simple little space-time diagram for the two 
protagonists where the lines of simultaneity are horizontal in the present 
time hyperplane of each.
All this is absurd.
How many more years or decades before all these stupid notions jump out of 
the textbooks?

R.H.