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Magnetic moment, in classical physics, is related to current in a loop, which in turn can be connected to angular momentum of a charged particle. Thus, in classical physics, magnetic moment and angular momentum are connected. In fact, they are proportional with the constant of proportionality being the gyromagnetic ratio. Moving to quantum mechanics, some ...


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That spin follows the angular momentum algebra is no accident - like angular momentum, it is part of the conserved quantity - the Noether charge - associated to rotations. The reason why the $\mathfrak{so}(3)$ transformations of spin should be indeed those associated to the $\mathfrak{so}(3)$ of spatial rotations is not answerable in QM alone - you have to ...


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Well after beating my head against the wall, I just decided to email Baez. He's a great guy by the way and it was very nice of him to answer completely unsolicited emails from a confused grad student, but he did as much twice! so I thank him. I'm convinced now that he had no intentions of constructing a globally conserved current using tetrads, or even ...



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