General Relativity with Spin and Torsion: Foundations and Prospects

@article{Hehl1976GeneralRW,
title={General Relativity with Spin and Torsion: Foundations and Prospects},
author={F. Hehl and P. Heyde and G. Kerlick and J. Nester},
journal={Reviews of Modern Physics},
year={1976},
volume={48},
pages={393-416}
}

A generalization of Einstein's gravitational theory is discussed in which the spin of matter as well as its mass plays a dynamical role. The spin of matter couples to a non-Riemannian structure in space-time, Cartan's torsion tensor. The theory which emerges from taking this coupling into account, the ${U}_{4}$ theory of gravitation, predicts, in addition to the usual infinite-range gravitational interaction medicated by the metric field, a new, very weak, spin contact interaction of… Expand