Lattice Schwinger Model with interpolated Gauge Fields

Details Lattice Schwinger Model with interpolated Gauge Fields Lattice Schwinger Model with interpolated Gauge Fields

1995-11-15

arxiv.org/abs/hep-lat/9511019v1

Phys.Rev. D53 (1996) 5090-5099

Physics

High Energy Physics

High Energy Physics - Lattice

14 pages

Scientific paper

10.1103/PhysRevD.53.5090

We analyze the Schwinger model on an infinite lattice using the continuum definition of the fermion determinant and a linear interpolation of the lattice gauge fields. The possible class of interpolations for the gauge fields, compatible with gauge invariance is discussed. The effective action for the lattice gauge field is computed for the Wilson formulation as well as for non-compact lattice gauge fields. For the non-compact formulation we prove that the model has a critical point with diverging correlation length at zero gauge coupling e. We compute the chiral condensate for e > 0 and compare the result to the N-flavor continuum Schwinger model. This indicates that there is only one flavor of fermions with the same chiral properties as in the continuum model, already before the continuum limit is performed. We discuss how operators have to be renormalized in the continuum limit to obtain the continuum Schwinger model.

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