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Metric-Affine Gauge Theory of Gravity: Field Equations, Noether Identities, World Spinors, and Breaking of Dilation Invariance
F. W. Hehl, J. D. McCrea, E. W. Mielke +1
In Einstein's gravitational theory, the spacetime is Riemannian, that is, it has vanishing torsion and vanishing nonmetricity (covariant derivative of the metric). In the gauging o…
Avoiding degenerate coframes in an affine gauge approach to quantum gravity
E. W. Mielke, J. D. McCrea, Y. Ne'eman +1
In quantum models of gravity, it is surmized that configurations with degenerate coframes could occur during topology change of the underlying spacetime structure. However, the cof…
Improved Energy-Momentum Currents in Metric-Affine Spacetime
Ralf Hecht, Friedrich W. Hehl, J. Dermott McCrea +2
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 a…