Up to this point we have used a scalar field to illustrate our discussion of the quantization procedure. However, Nature is richer than that and it is necessary to consider other fields with more complicated behavior under Lorentz transformations. Before considering these other fields we pause and study the properties of the Lorentz group.
Lorentz Group Creation-annihilation Operators Left-handed Weyl Spinors Dirac Field Free Real Scalar ﬁeld
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