QED2 as a testbed for interpolations between quenched and full QCD

Details QED2 as a testbed for interpolations between quenched and full QCD QED2 as a testbed for interpolations between quenched and full QCD

1997-10-03

arxiv.org/abs/hep-lat/9710020v1

Nucl.Phys.Proc.Suppl. 63 (1998) 811-813

Physics

High Energy Physics

High Energy Physics - Lattice

Talk presented by A. Duncan at LATTICE97 (theoretical developments)

Scientific paper

10.1016/S0920-5632(97)00908-0

Lattice QED2 with the Wilson formulation of fermions is used as a convenient model system to study artifacts of the quenched approximation on a finite lattice. The quenched functional integral is shown to be ill-defined in this system as a consequence of the appearance of exactly real modes for physical values of the fermion mass. The location and frequency of such modes is studied as a function of lattice spacing, lattice volume, topological charge and improved action parameters. The efficacy of the recently proposed modified quenched approximation is examined, as well as a new approach to the interpolation from the quenched to full dynamical theory employing a truncated form of the fermion determinant.

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