Quantum Field Theory and the Standard Model by Schwartz M.D. z-lib.org · Problem 8.2
Spin 1 and gauge invariance — Schwartz M.D. z-lib.org
Physics — QFT · energy-momentum-tensor-maxwell
Problem
Calculate the energy-momentum tensor corresponding to the Lagrangian L=−41Fμν2. Show that the energy density is positive definite, up to a total spatial derivative E−∂iX>0.