Physics, Astronomy & Cosmology / Re: Is length infinitely contracted for a photon at c?« on: 26/03/2020 02:08:52 »
A photon does not represent a valid reference frame. All valid frames have physics that is no different than any other frame, and this includes light moving at c. You're attempting to describe a frame in which a photon is at rest, which yields meaningless results.While I understand and agree with you, understanding this principle of length contraction from differing reference frames might help our interpretations of the double slit exp. and others.
So the best I can answer is that in such a 'frame', length is meaningless, as is time, mass, and just about any other meaningful thing in physics.
If a photon could be thought of a being capable of infinite length contraction then conversely when travelling its length could be of infinite length but from our frame of reference its the size of a photon.
It would mean there is no reverse causality involved in the quantum eraser exp because the photon is still connected to it's source until the instant it collapses to a particle.