my claim is that any photon created to shed energy is a complete event and the photon continues on its merry way until it interacts with matter. if you shine a flashlight at the sun chances are some of the photons will make it through the atmosphere and carry on until they reach the matter of our home star.
How do you suppose a massless particle of energy manages to travel upstream, so to speak, against an EM field of far greater magnitude.
virtual photons of a field become real when they find another particle capable of interaction and pass energy directly between the two particles involved. there is never a free real photon. adding and subtracting field strengths is simply calculation of the net force, and has no actual bearing on the number of photons which become real or the amount of energy transfered, which is determined by the charge and distance between the two particles.
Virtual photons do not enter into this discussion. Virtual photons are theoretical carriers of electromagnetic force between electrons and protons or neutrons, none of which have any part in this discussion.
one case involves an independent photon, the other case involves a photon created specifically to transfer a force and is never independently available to interact with other particles.
Again, virtual photons are theoretical carriers of the electromagnetic force between electrons and protons or neutrons. Not applicable to this conversation
just give it some thought, it will come to you.
I have, which is why I have a clue and you don't.
Here again is virtual photon defined by various sources.
The physics department at Oxford:
Virtual photons
Virtual photons
The electron and nucleon interact by the electromagnetic force, the carrier of this is the virtual photon as has different properties to ordinary photons. Take for example two electrons. These repel each other due to the electromagnetic force, we say that there is a mediator or exchange particle which is transferred between them, the photon. If one imagines two ice skaters facing each other and one throws a ball to the other person both skaters will move apart, just as two electrons would repel each other.
When delving inside the proton (or neutron) it is not the electron which actually 'probes' the nucleon but the photon. An electron gives some of its energy (and so loses some of its momentum) to the photon. The more momentum which is transferred to the photon, the more energy it has and so the shorter the wavelength of the photon. One can imagine that a longer wavelength photon will only 'see' the whole nucleon and so be elastically scattered, but for shorter wavelength photons it can 'see' the constituents of the nucleon, the quarks inside. This is why physicists want to build larger and larger accelerators, so that they can see more and more of the structure of particles.
http://www.theqxci.com/promorpheus/qxci_promorpheus_8.pdf
Photon - New World Encyclopedia
From this site, you might also read about wave particle duality:
Clip:
The photon is considered to have both wave and particle properties. As a wave, a single photon is distributed over space and shows wave-like phenomena, such as refraction by a lens and destructive interference when reflected waves cancel each other out; however, as a particle, it can only interact with matter by transferring the fixed amount (quantum) of energy "E," where:
where h is Planck's constant, c is the speed of light, and λ is the photon's wavelength. This is different from a classical wave, which may gain or lose arbitrary amounts of energy.
In short Ian, virtual photons are found within atoms, not zipping about the universe as free agents.