4-Dimensional Einstein Gravity Extended by a 3-Dimensional Gravitational Chern-Simons Term
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Abstract
When 4-dimensional general relativity is extended by a 3-dimensional gravitational Chern–Simons term an apparent violation of diffeormorphism invariance is extinguished by the dynamical equations of motion for the modified theory. The physical predictions of this recently proposed model show little evidence of symmetry breaking, but require the vanishing of the Pontryagin density.
Keywords
Chern-Simons terms diffeomorphism symmetry Lorentz symmetryPreview
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