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Physics
Quantum Physics
What exactly is spin? Does the standard model work without spin?
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[QUOTE="simonjech, post: 6866980, member: 733880"] You dont really need to use spin to explain this. Magnetic force can act on any charged object which has non zero velocity. [ATTACH type="full"]323781[/ATTACH] And we can define spin using Noethers theorem as a quantity which is conserved when lagrangian is symetric under the lorentz transformation (boost). If you analyse this more in field theory using the noethers charge you can obtain a general mathematical definition of spin for given lagrangian. But we can understand spin more if we look on a very similar quantity angular momentum. These two have almost identicall properties but the angular momentum is connected with spacial rotations and spin is connected with space time rotations. You can not really imagine what a spin is for this exact reason. [/QUOTE]
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Quantum Physics
What exactly is spin? Does the standard model work without spin?
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