"martin b. van der mark" nails the secret of the de Broglie Law of Phase Harmony

https://www.researchgate.net/profile/Martin_Van_der_Mark

I quoted 2 of his previous articles, one co-authored with Nobel physicist Gerard 't Hooft.

So then he includes an article in this 2015 collection

I quoted it above in my opening quotes section.

It is not always appreciated that the De Broglie wavelength for quantum particles is a direct consequence of the reciprocal

relativistic transformation of mass m = E/c2 and frequency f = E/h while representing the same energy. Note that while the

particle velocity is always below light speed, the De Broglie wave is simultaneously associated with a phase velocity vphase

= c2/v that is always higher than light speed.

components that are correlated over the entire wave function, so communicating, by phase difference, the spin state at super-luminal phase velocity.

For the “photon”, the previous statement is just as true, but the phase and group velocity are equal to the speed of light.

Here, an extra insight, obtained from Tetrode, Einstein and Wheeler and Feynman can be applied: The interval of time and space are both zero as seen from an observer traveling at the speed of light watching the emission and absorption of a co-moving light ray or “photon”. In this frame, the emission can be interpreted as the causal transfer of energy to the absorber, by invitation of the absorber. The emitter, electromagnetic wave and absorber are part of the same, indivisible single event.