Kinetic coefficient
= Kinetic coefficient
{title2=$\Gamma$}
For <nonconserved order-parameter dynamics>, the positive kinetic coefficient $\Gamma$ converts the <functional derivative> of the <free energy> into a relaxation rate through $\dot p=-\Gamma\,\delta F/\delta p$. <Microscopic reversibility> fixes the accompanying <Gaussian white noise> variance by the <Model A fluctuation-dissipation relation>.