QED2 as a testbed for interpolations between quenched and full QCD
Abstract
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.
Cite
@article{arxiv.hep-lat/9710020,
title = {QED2 as a testbed for interpolations between quenched and full QCD},
author = {W. Bardeen and A. Duncan and E. Eichten and H. Thacker},
journal= {arXiv preprint arXiv:hep-lat/9710020},
year = {2009}
}
Comments
Talk presented by A. Duncan at LATTICE97 (theoretical developments)