Minimal and nonminimal gravitational interactions, and the asymmetric energy momentum tensor
Minimal and nonminimal gravitational couplings are discussed in terms of the translation gauge fields b k μ, which are necessary to describe the gravitational interaction of the spin 1/2 field. For this purpose we carry out the extension of the conventional tetrad formalism of general relativity. Our general framework contains four arbitrary parameters; one of them represents the asymmetry of the affine connection (or equivalently that of the energymomentum tensor) and the others measure possible deviations from Einstein's gravitational Lagrangian, which will be responsible for spin effects. We also discuss the physical meaning of the invariance requirement with respect to the Poincaré gauge transformation that uniquely leads us within the present framework to Einstein's theory of gravity.
KeywordsGeneral Relativity Physical Meaning General Framework Differential Geometry Gauge Transformation
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