Einstein–Cartan theory in theoretical physics extends general relativity, to handle spin angular momentum correctly. As the master theory of classical physics, general relativity has one known flaw: it cannot describe "spin orbit coupling", that is, exchange of intrinsic angular momentum (spin) and orbital angular momentum. There is a qualitative theoretical proof showing that general relativity must be extended to Einstein–Cartan theory when matter with spin is present.
Experimental effects are too small to be observed at the present time.
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