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From: hitlong@yahoo.com (gharnagel)
Newsgroups: sci.physics.relativity
Subject: Re: Steel Man of Einstein & Relativity.
Date: Tue, 10 Sep 2024 14:13:16 +0000
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On Tue, 10 Sep 2024 11:02:01 +0000, Richard Hachel wrote:
>
> Le 10/09/2024 à 05:01, clzb93ynxj@att.net (LaurenceClarkCrossen) a écrit
> >
> > Paul: When photons have no mass how can gravity affect them?
>
> Yes, it's strange.

Not "strange" at all:

E = mc^2/sqrt(1 - v^2/c^2), p = mv/sqrt(1 - v^2/c^)

(which can be derived from the relativistic Lagrangian for a
free particle).  Then

E^2 - p^2c^2 = m^2c^4/(1 - v^2/c^2) - m^2v^2c^2/(1 - v^2/c^2)
(1 - v^2/c^2)m^2c^4/(1 - v^2/c^2) = m^2c^4

E^2 - p^2c^2 = m^2c^4

Even though m = 0 for photons, they still have energy and momentum.
Energy has mass: E = mc^2

> Photon ---> No mass
>
> Ether ---> Not exists
>
> ---> deviation of a massless body by an ether that does not exist.
>
> R.H.

A more realistic question is, how can a massive body affect
ANY particle at a distance when there is nothing in between?
Hence the presumption of fields.  Are fields real?  Feynman
said, "photons are particles."  By extension, gravitons are
also particles, and particles don't need an ether, and a field
is merely an approximation of the behavior of a large number
of particles.

Admittedly, gravitons would be a bit "strange" :-)