Corroborating the equivalence between the Duffin-Kemmer-Petiau and the Klein-Gordon and Proca equations
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It is shown that the Hamiltonian version of the Duffin-Kemmer-Petiau theory with electromagnetic coupling brings about a source term at the current. It is also shown that such a source term disappears from the scenario if one uses the correct physical form for the Duffin-Kemmer-Petiau field, regardless of the choice for representing the Duffin-Kemmer-Petiau matrices. This result is used to fix the ambiguity in the electromagnetic coupling in the Duffin-Kemmer-Petiau theory. Moreover, some widespread misconceptions about the Hermiticity in the Duffin-Kemmer-Petiau theory are discussed. © 2014 American Physical Society.
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Physical Review A - Atomic, Molecular, and Optical Physics, v. 90, n. 2, 2014.
