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From: "Paul.B.Andersen" <relativity@paulba.no>
Newsgroups: sci.physics.relativity
Subject: Re: Langevin's paradox again
Date: Sun, 14 Jul 2024 21:33:31 +0200
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Den 14.07.2024 19:40, skrev Richard Hachel:
> Le 14/07/2024 à 19:07, "Paul.B.Andersen" a écrit :
>> Den 14.07.2024 04:02, skrev Richard Hachel:
>>>  it seems that apart from me, no one in the world has had the trigger for the complete explanation of the Langevin traveler.

>> What do you mean by "complete explanation"?
> 
> By this I mean that the explanation given by physicists is correct, but 
> very incomplete.

Physicists don't explain (in the sense you use the word) anything.
They tell you what physics theories predict.

Have you ever seen "the complete explanation" for why
the Earth is orbiting the Sun?

Can you give the "complete explanation"?

> 
> They say, like you, like me, that Stella will come back at the age of 18,
> and Terrence will be 30 years old.

Right. They and we tell what the theory predicts.

> If we carry the problem even more precisely, and we introduce a small 
> acceleration phase, we can even say that Stella will be 18 years and 24 
> hours old, and that Terrence will be 30 years and 40 hours old.

Your "acceleration phase" is no different from
the rest of the journey. Stella's proper time is:
  (30 years and 40 hours)/γ = 18 years and 24 hours.

So if we introduce "a small acceleration phase" - what then?


> But being certain that you are right, that Doctor Hachel is right, that the physicists are right, that is not enough.
> 
> We must explain why correctly and with essential mathematical precision.
> 
> And there, a problem arises: only Richard Hachel can break down the evolution, observer by observer, segments by segments whatever they may be.

So please break down the evolution, observer by observer, segments by 
segments and explain correctly and with essential mathematical precision 
why Terrence ages 30 years and 40 hours while Stella ages 18 years and
24 hours

Can you do that?
Or can you only claim that you can do that?

-- 
Paul

https://paulba.no/