The Fourth Root of Gravity
arXiv:gr-qc/9304014
Abstract
By attaching basis vectors to the components of matter fields, one may render free action densities fully covariant. Both the connection and the tetrads are quadratic forms in these basis vectors. The metric of spacetime, which is quadratic in the tetrads, is then quartic in the basis vectors.
5 pages, UNM-frg