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Forums
Physics
Quantum Physics
Spin conservation in the Dirac equation
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[QUOTE="chingel, post: 6011408, member: 331385"] Thank you for the link. There they calculate that the expectation value of the change of the spin or angular momentum is zero. While the expectation value does not change, they still seem to say that Zitterbewegung causes the spin to change in some sense. I still don't quite understand why or how, maybe someone can explain it to me. To maybe make my question clearer, if I have the spin operator ##\vec{\Sigma} = \begin{bmatrix} \vec{\sigma} & 0 \\ 0 & \vec{\sigma} \end{bmatrix}## and a solution of the Dirac equation ##u(p) = e^{-ip_\mu x^\mu} \sqrt{E+m} \begin{bmatrix} 1 \\ 0 \\ \frac{p_z}{E+m} \\ \frac{p_x+ip_y}{E+m} \end{bmatrix}##, then if at all and why does the spin of this solution change over time, and if it is Zitterbewegung then how exactly the Zitterbewegung works here to change the spin? [/QUOTE]
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Physics
Quantum Physics
Spin conservation in the Dirac equation
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