Fixed Point Actions for Lattice Fermions

Details Fixed Point Actions for Lattice Fermions Fixed Point Actions for Lattice Fermions

1993-11-16

arxiv.org/abs/hep-lat/9311016v1

Nucl.Phys.Proc.Suppl. 34 (1994) 516-521

Physics

High Energy Physics

High Energy Physics - Lattice

6 pages, figures 1 and 4 included, figures 2,3,5,6,7 can be obtained from wiese@hlrserv.hlrz.kfa-juelich.de

Scientific paper

10.1016/0920-5632(94)90434-0

The fixed point actions for Wilson and staggered lattice fermions are determined by iterating renormalization group transformations. In both cases a line of fixed points is found. Some points have very local fixed point actions. They can be used to construct perfect lattice actions for asymptotically free fermionic theories like QCD or the Gross-Neveu model. The local fixed point actions for Wilson fermions break chiral symmetry, while in the staggered case the remnant $U(1)_e \otimes U(1)_o$ symmetry is preserved. In addition, for Wilson fermions a nonlocal fixed point is found that corresponds to free chiral fermions. The vicinity of this fixed point is studied in the Gross-Neveu model using perturbation theory.

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