Equation 14.13.8677E6AB0568A

\begin{equation} -D^2\Phi _ g(B,B^*) =\operatorname {tr}\bigl (P_\gamma (g)^{-1}P_\gamma (B) P_\gamma (g)^{-1}P_\gamma (B)^*\bigr )\geq 0. \end{equation}