Abstract
A theory of gravitation in 4D is presented with strings used in the material action in U 4 spacetime. It is shown that the string naturally gives rise to torsion. It is also shown that the equation of motion a string follows from the Bianchi identity, gives the identical result as the Noether conservation laws, and follows a geodesic only in the lowest order approximation. In addition, the conservation laws show that strings naturally have spin, which arises not from their motion but from their one dimensional structure.
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Hammond, R.T. Strings in Gravity with Torsion. General Relativity and Gravitation 32, 2007–2019 (2000). https://doi.org/10.1023/A:1001942301598
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DOI: https://doi.org/10.1023/A:1001942301598