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exponent137
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In book Quantum Electrodynamics, Feynman wrote that the Dirac equation is a relativistic form of the Pauli equation, not a correct form of Klein-Gordon equation. But, I think that the electron spin is only assumed in Pauli equation, but Dirac equation derives it?
I went through derivation in Feynman book, but somewhere I found something better. I do not find it now. It tries to linearize Klein-Gordon equation and so it obtains Dirac equations. Do anyone know any link? Why linearization is necessary? Why \gamma matrices are the only option? (I need to think to ask more concretely, because I think that there is more simple explanation.)
I went through derivation in Feynman book, but somewhere I found something better. I do not find it now. It tries to linearize Klein-Gordon equation and so it obtains Dirac equations. Do anyone know any link? Why linearization is necessary? Why \gamma matrices are the only option? (I need to think to ask more concretely, because I think that there is more simple explanation.)