Spin 1 fields in Riemann-Cartan space-times "via" Duffin-Kemmer-Petiau   theory
  We consider massive spin 1 fields, in Riemann-Cartan space-times, described by Duffin-Kemmer-Petiau theory. We show that this approach induces a coupling between the spin 1 field and the space-time torsion which breaks the usual equivalence with the Proca theory, but that such equivalence is preserved in the context of the Teleparallel Equivalent of General Relativity. 
R. Casana, B. M. Pimentel (Sao Paulo, IFT), J. T. Lunardi (Ponta   Grossa State U.) and R. G. Teixeira (Sao Judas Tadeu U.)