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blackbody radiation



After all the philosphical threads lately, I have a much "simpler"
question. I was asked to explain exactly why there are black body
radiators, and how they radiate. After giving a typical txtbook answer,
I tried to think about what it is fundamentally. Blackbody radiation is
EM radiation, but what mechanism produces it, especially in objects a
low temperatures. What about a gas of neutral neutrons? I am used to
thinking of EM waves being generated by accelerating charges, or at
least charges changing states, but this doesn't seem to work in general.
Any information or reference for information would be appreciated.
James Mackey