basic_notions:spin
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basic_notions:spin [2019/11/29 13:13] (current) 129.13.36.189 [Concrete] |
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| <tabbox Intuitive> | <tabbox Intuitive> | ||
| + | One of the biggest discoveries in the last century was that elementary particles have spin, which is some kind of internal angular momentum. This was discovered by the famous [[experiments:stern-gerlach|Stern-Gerlach experiment]]. | ||
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| + | In abstract terms you can think about spin as a label that tells us how particles behave in experiments, exactly as the [[basic_notions:mass|mass]] or the electric [[basic_notions:charge|charge]]. For example, a particle with electric charge behaves different than one without in experiments and the same is true for spin. | ||
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| + | There are particles with spin $0$, particles with spin $\frac{1}{2}$ and particles with spin $1$. For each of these different particle types we have a different [[:equations|equation]]that describes their behavior. | ||
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| + | ---- | ||
| * [[https://medium.com/starts-with-a-bang/spin-the-quantum-property-that-should-have-been-impossible-40bd52548b22|Spin: The Quantum Property That Should Have Been Impossible]] by Paul Halpern | * [[https://medium.com/starts-with-a-bang/spin-the-quantum-property-that-should-have-been-impossible-40bd52548b22|Spin: The Quantum Property That Should Have Been Impossible]] by Paul Halpern | ||
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| * For the origin of spin, see http://rickbradford.co.uk/NoethersTheorem.pdf | * For the origin of spin, see http://rickbradford.co.uk/NoethersTheorem.pdf | ||
| * [[http://math.ucr.edu/home/baez/spin/spin.html|Spin]] by Michael Weiss | * [[http://math.ucr.edu/home/baez/spin/spin.html|Spin]] by Michael Weiss | ||
| + | * https://arxiv.org/abs/1806.01121 | ||
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| <tabbox Abstract> | <tabbox Abstract> | ||
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| and[[http://people.westminstercollege.edu/faculty/ccline/courses/phys425/AJP_54(6)_p500.pdf| What is spin?]] by HC Ohanian | and[[http://people.westminstercollege.edu/faculty/ccline/courses/phys425/AJP_54(6)_p500.pdf| What is spin?]] by HC Ohanian | ||
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| + | An interesting alternative perspective was put forward by Hestenes in his paper [[http://geocalc.clas.asu.edu/pdf/ZBW_I_QM.pdf|The Zitterbewegung Interpretation of Quantum Mechanics]]. In this paper he argues that spin arises due to the permanent zig-zag motion of electrons (and all other particles). This zig-zag motion is the result of permanent collisions with background Higgs bosons which cause chirality flips from left-chiral to right-chiral states. | ||
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| + | See also [[https://arxiv.org/abs/1806.01121|How Electrons Spin]] by Charles T. Sebens | ||
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