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Vector couplings in the Duffin-Kemmer-Petiau theory are revised. It is shownthat minimal and nonminimal vector potentials behave differently undercharge-conjugation and time-reversal transformations. In particular, it isshown that nonminimal vector potentials have been erroneously applied to thedescription of elastic meson-nucleus scatterings and that the space componentof the nonminimal vector potential plays a crucial role for the confinement ofbosons. The DKP equation with nonminimal vector linear potentials is mappedinto the nonrelativistic harmonic oscillator problem and the behavior of thesolutions for this sort of DKP oscillator is discussed in detail. Furthermore,the absence of Klein's paradox and the localization of bosons in the presenceof nonminimal vector interactions are discussed.

On the nonminimal vector coupling in the Duffin-Kemmer-Petiau theory and the confinement of massive bosons by a linear potential