Re: the notion of counter-intuitiveness in relativistic physics

Le 10/08/2024 à 23:32, hitlong@yahoo.com (gharnagel) a écrit :

On Sat, 10 Aug 2024 20:08:21 +0000, Richard Hachel wrote:

u = (u' + v)/(1 + u'v/c^2) [A]

As a relativistic reminder:
Vo=Vr/sqrt(1+Vr²/c²)
Vr=Vo/sqrt(1-Vo²/c²)

 Nope.  Only the relativistic velocity composition equation is
necessary (Equation [A]), which comes directly from the LTEs:
 dx' = gamma(dx - vdt)
dt' = gamma(dt - vdx/c^2)
 dx'/dt' = (dx/dt - v)/(1 - vdx/dt/c^2)

 Absolutely, but...  And y? And z? But that's not what I'm talking about!
I'm talking about the notion of universal anisochrony, and the fact that, very strangely, if we observe transverse motions,
we can never measure a speed greater than c.
But that in the longitudinal direction, and everything proves it, both theory and experiment, we can observe things live.
There is a geometry of space-time that is real, and lots of others (including Minkowski's that are not).
You give me the equation for adding longitudinal relativistic speeds as if I didn't know it, are you kidding?
No, only do I know it, but I can give it to you in general observable form, in general real form or in vector form.
I'll remind you of it here, in observable form and in real form.
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R.H. --
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