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  1.  22
    Bianchi Identities and the Automatic Conservation of Energy-Momentum and Angular Momentum in General-Relativistic Field Theories.Friedrich W. Hehl & J. Dermott McCrea - 1986 - Foundations of Physics 16 (3):267-293.
    Automatic conservation of energy-momentum and angular momentum is guaranteed in a gravitational theory if, via the field equations, the conservation laws for the material currents are reduced to the contracted Bianchi identities. We first execute an irreducible decomposition of the Bianchi identities in a Riemann-Cartan space-time. Then, starting from a Riemannian space-time with or without torsion, we determine those gravitational theories which have automatic conservation: general relativity and the Einstein-Cartan-Sciama-Kibble theory, both with cosmological constant, and the nonviable pseudoscalar model. The (...)
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  2.  13
    Progress in Metric-Affine Gauge Theories of Gravity with Local Scale Invariance.Friedrich W. Hehl, J. Dermott McCrea, Eckehard W. Mielke & Yuval Ne'eman - 1989 - Foundations of Physics 19 (9):1075-1100.
    Einstein's general relativity theory describes very well the gravitational phenomena in themacroscopic world. In themicroscopic domain of elementary particles, however, it does not exhibit gauge invariance or approximate Bjorken type scaling, properties which are believed to be indispensible for arenormalizable field theory. We argue that thelocal extension of space-time symmetries, such as of Lorentz and scale invariance, provides the clue for improvement. Eventually, this leads to aGL(4, R)-gauge approach to gravity in which the metric and the affine connection acquire the (...)
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  3.  29
    The Shape of Space.J. Dermott McCrea - 1978 - Philosophical Studies (Dublin) 26:342-343.
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    The Shape of Space. [REVIEW]J. Dermott McCrea - 1978 - Philosophical Studies (Dublin) 26:342-343.
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  5. The Shape of Space.J. Dermott McCrea - 1978 - Philosophical Studies 26:342-343.
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