Re: Langevin's paradox again

Le 14/07/2024 à 19:07, "Paul.B.Andersen" a écrit :

Den 14.07.2024 04:02, skrev Richard Hachel:

If Stella was accelerating longitudinally, the speed would change
and γ would be a function  of time, so the acceleration would
obviously affect Stella's proper time.

 Absolutely not.
 Proper time is an invariant.
 Acceleration no affects anything, only improper time because speed is différent.  Acceleration is measured in the reference frame of the accelerating object, and as the external space that accelerates relative to it.
It is therefore both completely inactive in proper time, remains constant in this frame of reference, and becomes relative if it is measured in the observing frame of reference.
 R.H.