Summary
Over the years a third-rank antisymmetric tensor field, derived as the exterior derivative of a potential, has been considered as a part of string theory Lagrangians. It is shown that this antisymmetric field arises naturally in a theory of gravitation with a torsion potential in four dimensions. In this case, the physical significance of the antisymmetric field corresponds to a propagating spin field, and the material source is shown to consist of a loop, and not a point.
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Hammond, R. Stringy torsion. Nuov Cim B 109, 319–323 (1994). https://doi.org/10.1007/BF02727294
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DOI: https://doi.org/10.1007/BF02727294