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Just a short question: I am currently calculating the momentum density of a free dirac wavefunction under boost. However, I get some complex density - can this happen or will it be a mistake on my side?

Thanks for your comments!

Blue2script

PS: In some forum there was a note that momentum density is derived from the real Lagrangian. What does that mean? I just took the momentum density given from the energy-momentum tensor of the normal Dirac Lagrangian.

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# Complex momentum density

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