In a lecture on Maxwell's equations, I noticed that for radiation to occur there has to be acceleration. Does this have any relation to specific heat? I have many questions regarding this, actually. If radiative heat is always mediated by photons, and radiation only occurs with acceleration, does that mean that light has infinite acceleration, less it would not be radiating? Forgive any apparent stupidity in the question! Also, I realize this is from classical physics, but I wanted to relate this directly to QED and understand how they are related, and the same questions apply to QED as well.