He couldn't teach you something if his life depended on it. Torsion Gravity a reappraisal. [lots of citations]. http://arxiv.org/abs/gr-qc/0501017 The initial idea was Einsteins and it was called Teleparallel Gravity. It's equivalent to GR and I remember Kip Thorne saying, in his book Black Holes and Time Warps, he prefers it's use when he's working on gravitational wave physics.