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My question is. Can in principle, a Lagrangian density for some theory be a pseudo-scalar. Normally people say that the Lagrangian needs to be a scalar, but it case it is a pseudo-scalar it would also be a eigaen function of the parity operator.

This topic could well be on the classical physics section, but as this is more relevant in quantum theory I decided to place it here.

Thanks

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# Lagrangian, scalar or pseudo-scalar?

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