Can anyone explain to me how these fit into the bigger picture of the Dirac equation, or suggest a reference?(adsbygoogle = window.adsbygoogle || []).push({});

The only thing I've been able to absorb from reading about these is that they explain the choice of normalization for plane waves [itex]\psi[/itex] (since [itex]\psi^\dag\psi[/itex] is the fourth component of a 4-vector and hence must transform as the 4th component of the momentum-energy vector).

Incidentally, I've been reading about how solution to the charge conjugated Dirac equation is a negative energy state, thus giving support to the ``positron ~ negative energy solution to Dirac equation" theory.

Is there any physical reason why the bilinear covariants should be invariant under charge conjugation?

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# Bilinear covariants

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