Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2004-10-28
JHEP0411:006,2004
Physics
High Energy Physics
High Energy Physics - Lattice
Minor typos fixed. Version to be published in JHEP
Scientific paper
10.1088/1126-6708/2004/11/006
We propose a discretization of two dimensional Euclidean Yang-Mills theories with N=2 supersymmetry which preserves exactly both gauge invariance and an element of supersymmetry. The approach starts from the twisted form of the continuum super Yang Mills action which we show may be written in terms of two real Kahler-Dirac fields whose components transform into each other under the twisted supersymmetry. Once the theory is written in this geometrical language it is straightforward to discretize by mapping the component tensor fields to appropriate geometrical structures in the lattice and by replacing the continuum exterior derivative and its adjoint by appropriate lattice covariant difference operators. The lattice action is local and possesses a unique vacuum state while the use of Kahler-Dirac fermions ensures the model does not exhibit spectrum doubling.
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