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Improved Energy-Momentum Currents in Metric-Affine Spacetime | | Ralf Hecht
; Friedrich W. Hehl
; J. Dermott McCrea
; Eckehard W. Mielke
; Yuval Ne’eman
; | | Date: |
15 Oct 1992 | | Journal: | Phys.Lett. A172 (1992) 13-20 | | Subject: | gr-qc hep-th | | 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. | | Source: | arXiv, gr-qc/9210009 | | Other source: | [GID 1047171] gr-qc/9210009 | | Services: | Forum | Review | PDF | Favorites | |
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