Supersymmetry in 6d Dirac Action

Abstract

We investigate a 6d Dirac fermion on a rectangle. It is found that the 4d spectrum is governed by $N=2$ supersymmetric quantum mechanics. Then we demonstrate that the supersymmetry is very useful for classifying all the allowed boundary conditions and to expand the 6d Dirac field in Kaluza-Klein modes. A striking feature of the model is that even though the 6d Dirac fermion has non-vanishing bulk mass, the 4d mass spectrum can contain degenerate massless chiral fermions, which may provide a hint to solve the problem of the generation of quarks and leptons. It is pointed out that zero-energy solutions are not affected by the presence of the boundaries, while the boundary conditions work well for determining the positive-energy solutions. We also provide a brief discussion on possible boundary conditions in the general case, especially those on polygons.

38 page, 1 figures

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Cited by in corpus (6)

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• Dynamical generation of fermion mass hierarchy in an extra dimension
• Index theorem on $T^2/{\mathbb{Z}}_N$ orbifolds
• Extended supersymmetry with central charges in Dirac action with curved extra dimensions
• 5d Dirac fermion on quantum graph
• Extended supersymmetry with central charges in higher dimensional Dirac action