Abstract
Some models are presented in which the strength of the gravitational coupling of the potential energy relative to the same coupling for the kinetic energy is, in a precise sense, adjustable. The gauge symmetry of these models consists of those coordinate changes with unit Jacobian.
- Received 2 May 2007
DOI:https://doi.org/10.1103/PhysRevD.76.064013
©2007 American Physical Society
