The causal approach proof for the equivalence of SDKP4 and SQED4 at tree-level

@article{Beltrn2018TheCA,
  title={The causal approach proof for the equivalence of SDKP4 and SQED4 at tree-level},
  author={Jos{\'e} Beltr{\'a}n and Bruto Max Pimentel and D. E. Soto},
  journal={International Journal of Modern Physics A},
  year={2018}
}
The description of the electromagnetic interaction of charged spinless particles is usually formulated by the Scalar Quantum Electrodynamics. However, there is an alternative formulation given by the Duffin–Kemmer–Petiau theory: the Scalar DKP gauge theory. The proof of the equivalence between these two formulations has been discussed in many researches, but there is not yet a conclusive proof. In this paper, we initiate a complete proof in the framework of the Causal Perturbation theory… 

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