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On 2002-11-03 19:19, JS Princeton wrote:
The number density of photons is a well determined quantity no matter what the energy scale. Even if your photons are more wavelike than particlelike they are still photons and are still quantatized.
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For the number of photons to be conserved, it requires total decoupling from the medium. Once they are allowed to interact - they breed like bunnies, the faster the more wavelike they are. Feed a radio wave through a degenerate plasma - enjoy the broad output spectrum all the way till wavelengths about the plasma sample size. And, btw, photons' interaction with free charges is not quantized.
Even if you ensure that photons are pointlike, there's still gravity, which means that even then they do interact and secondary photons are produced since the original ones gravitate to plasma.
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Well, we have a lower and upper bound on the mass of neutrinos which end up contributing not a significant amount to the gravitational dynamics and kinematics of the universe at the present epoch.
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Who cares of their mass? Not me, here and now that is. Them neurinos carry kinetic energy, they are very likely to have magnetic moment; if so - they interact with photons as if the photons were a slow field and happily carry away energy in tiny chunks. That's as simple as could be.