In relativistic limit the spin and the angular momentum are not of conservation because of spin-orbit interaction.Then the symmetry SU(2) is broken because vector spin does not commute with the interaction Hamintonian.The SO(3) symmetry is also broken for the same reason.So I do not understand why the sum of spin and angular momentum is of conservation in relativistic limit(then the spin and the angular momentum transform to each other).(adsbygoogle = window.adsbygoogle || []).push({});

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# Why can the spin and the angular momentum transform to each other?

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