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Why cannot we say that spin of "fundamental" particles is exactly an evidence or "proof" of space-time torsion?

Remark: spin is generally a source of torsion when gravity couples to fermions, so...Why can not be said spin is torsion in disguise?

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marked as duplicate by Emilio Pisanty, knzhou, Jon Custer, sammy gerbil, Kyle Kanos Feb 15 '18 at 10:56

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    $\begingroup$ Because it's not. $\endgroup$ – Slereah Feb 13 '18 at 20:39
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    $\begingroup$ Do you have a proposed mechanism for why these two should be related? As it stands I can't think of any reason this should be the case. Please go into more detail with your reasoning if you want a good answer. Also, possibly relevant answer $\endgroup$ – gabe Feb 13 '18 at 20:42
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    $\begingroup$ Possible duplicate of Spacetime Torsion, the Spin tensor, and intrinsic spin in Einstein-Cartan theory $\endgroup$ – gabe Feb 13 '18 at 20:45
  • $\begingroup$ there is some disconnected/ unconventional research into this area linking QM to fluid dynamics, solitons, and pilot wave hydrodynamics theories, reminds me of electron cycles Zitterbewegung en.wikipedia.org/wiki/Zitterbewegung try dropping by Physics Chat sometime for more investigation $\endgroup$ – vzn Feb 13 '18 at 21:10
  • $\begingroup$ There is no particular reason for spin to be a source of torsion. Dirac spinors can be coupled to ordinary torsion-free GR with no problem. Some people like Einstein-Cartan for aesthetic reasons, but it is not logically required for spinning particles. $\endgroup$ – mike stone Feb 13 '18 at 21:38