Phys. Rev. D 76, 064013 (2007) [9 pages]Unimodular cosmology and the weight of energyReceived 2 May 2007; published 13 September 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.76.064013
DOI:
10.1103/PhysRevD.76.064013
PACS:
04.50.+h
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