If the acceleration of the charge is constant, it radiates. However, the radiation reaction force, which depends only on the third and higher derivatives of x with respect to t, is 0. How is this explained? Didn't Feynman say that, in fact, in the case of constand acceleration, there's NO radiation? I have also read that it is an experimental fact that an accelerated charge radiates, even if the acceleration is constant. This question has been really bugging me for many months. I still haven't been able to find the answer. SO WHAT'S THE DEAL HERE???????????