- #1
Feynlee
- 8
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Say I have a particle in the rest frame with spin up in the z direction. If I boost the system in x direction, does the spin still point in the z direction? Why or why not?
In Dirac Spinor, if I choose "spin up", namely setting [itex]\phi=\begin{bmatrix}1\\0\end{bmatrix}[/itex] in the notation shown in Wikipedia, does it mean that it's pointing in the positive z direction regardless of the momentum direction of the particle? Or in other words, what direction does a general Dirac spinor with "spin up" points to?
In Dirac Spinor, if I choose "spin up", namely setting [itex]\phi=\begin{bmatrix}1\\0\end{bmatrix}[/itex] in the notation shown in Wikipedia, does it mean that it's pointing in the positive z direction regardless of the momentum direction of the particle? Or in other words, what direction does a general Dirac spinor with "spin up" points to?