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The lattice Schwinger model as a discrete sum of filled Wilson loops
1999
Nuclear Physics B
Using techniques from hopping expansion we identically map the lattice Schwinger model with Wilson fermions to a model of oriented loops on the lattice. This is done by first computing the explicit form of the fermion determinant in the external field. Subsequent integration of the gauge fields renders a sum over all loop configurations with simple Gaussian weights depending on the number of plaquettes enclosed by the loops. In our new representation vacuum expectation values of local fermionic
doi:10.1016/s0550-3213(99)00467-8
fatcat:v3pxaguov5eoznaqq5mkcfbtte