Improved Energy-Momentum Currents in Metric-Affine Spacetime
Abstract
In Minkowski spacetime it is well-known that the canonical energy-momentum current is involved in the construction of the globally conserved currents of energy-momentum and total angular momentum. For the construction of conserved currents corresponding to (approximate) scale and proper conformal symmetries, however, an improved energy-momentum current is needed. By extending the Minkowskian framework to a genuine metric-affine spacetime, we find that the affine Noether identities and the conformal Killing equations enforce this improvement in a rather natural way. So far, no gravitational dynamics is involved in our construction. The resulting dilation and proper conformal currents are conserved provided the trace of the energy-momentum current satisfies a (mild) scaling relation or even vanishes.
Keywords
Cite
@article{arxiv.gr-qc/9210009,
title = {Improved Energy-Momentum Currents in Metric-Affine Spacetime},
author = {Ralf Hecht and Friedrich W. Hehl and J. Dermott McCrea and Eckehard W. Mielke and Yuval Ne'eman},
journal= {arXiv preprint arXiv:gr-qc/9210009},
year = {2008}
}
Comments
14pp