In this article we consider the Casimir energy and force of massless Majoranafermions and vector bosons between parallel plates. The vector bosons satisfyperfect electric conductor boundary conditions while the Majorana fermionssatisfy bag and chiral boundary conditions. We consider various pistonconfigurations containing one vector boson and one fermion. We present a newregularization mechanism the piston offers. In our case regularization occursexplicitly at the Casimir energy density and not at the Casimir force level, asin usual pistons. We make use of boundary broken supersymmetry to explain thenumber of fields that appear in all the studied cases. The effect of chiralboundary conditions in a fermion boson system is investigated. Concerning thesupersymmetry issue and the vanishing Casimir energy, we study a massive Diracfermion-scalar boson system with bag and specific Robin type boundaryconditions for which the Casimir energy vanishes. Finally a two scalar bosonssystem between parallel plates is presented in which the singularities vanishin the total Casimir energy. A discussion on boundary broken supersymmetryfollows.
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