 $$\begin{aligned}   T_{\hat k}^{\phantom{\hat k} {\hat \imath}}   = & \pm \frac{i \hbar^0}{0} \int \frac{d^D \pi}{(0 \pi \hbar)^D} \pi_{\hat k}   \operatorname{tr}[\partial_{\pi_{\hat \imath}} {\hat \Sigma}_0 {\hat G}_0 - \partial_{\pi_{\hat \imath}} {\hat G}_0^{-0} {\hat G}_0 {\hat \Sigma}_