Sunday, 24 June 2018

lagrangian formalism - Energy-momentum tensor of the Dirac field


I'm trying to compute the energy momentum tensor for the dirac field L=ˉψ(iγμμm)ψTμν=L(μψ)νψημνL and I'm not clear on how to treat the term in ημνL: the first term gives iˉψγμνψ which is the tensor given by Peskin-Schroeder but I don't get how to compute the term in η




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