Re: Relativity Derives Zero Deflection of Light By Gravity.

Le 20/02/2025 à 20:34, clzb93ynxj@att.net (LaurenceClarkCrossen) a écrit :

Thank you for reminding me of Paul's ignorant comment. It's his usual
appeal to experiment that begs the question of the derivation's
validity. Paul is ignorant of the lack of a derivation for the doubling.
Jan is saying you can have momentum without mass because he's ignorant
that momentum requires mass: p = mv.

One of the fundamental questions was: do photons have mass.
Except that if photons had mass, their energy would be infinite.
Having no mass, not even having existence (zero tau), it is difficult to conceive of a quantity of motion for them if p=mv.
In good theory, the quantity of motion of a mass in relativistic motion seems to be p=m.Vr where Vr is the real speed
in the measuring frame. Which corresponds (since Vr=Vo/sqrt(1-Vo²/c²) to p=m.Vo/sqrt(1-Vo²/c²).
But this cannot apply to the photon, which is only a quantum of energy passing instantly from one atom to another (in the receiver's frame of reference).
The illusion of a speed c being purely local (the observer is not really at the source, nor at the receiver, but "between the two", since he places a watch here, and the other there, that is to say in two different places).
R.H.