- #1

- 38

- 0

\begin{equation}

\Tr{F^{\mu \nu} F_{\mu \nu} }

\end{equation}

Is not allowed for a non-compact lie group because it does not lead to a positive definite Hamiltonian. I was wondering if anyone knew of a general way to gauge non-compac lie groups. I know there must be a way since the Lorentz group can be gauged to give the Einstein Hilbert action.