Psy-Kosh comments on Open Thread: November 2009 - Less Wrong
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Didn't look all the way through that paper yet, but... if you mean the Riemann curvature tensor having antisymmetric parts... so? How does that kill GR? (besides, anti symmetry is a type of symmetry. I didn't mean symmetric as in "symmetric vs antisymmetric tensors", I meant it in the more general sense.)
(Okay, I know of Einstein-Cartan-Theory, but I haven't studied it yet. I still only have a rudimentary grasp of the math of basic GR)
But... what's any of this got to do with my original question?