Phys. Rev. D 79, 127501 (2009) [4 pages]Modified coupling procedure for the Poincaré gauge theory of gravityReceived 25 March 2009; published 18 June 2009 The minimal coupling procedure, which is employed in standard Yang-Mills theories, appears to be ambiguous in the case of gravity. We propose a slight modification of this procedure, which removes the ambiguity. Our modification justifies some earlier results concerning the consequences of the Poincaré gauge theory of gravity. In particular, the predictions of the Einstein-Cartan theory with fermionic matter are rendered unique. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.79.127501
DOI:
10.1103/PhysRevD.79.127501
PACS:
04.50.Kd, 04.40.−b, 11.15.−q, 11.30.Er
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