Quenched approximation artifacts: A study in two-dimensional QED

被引：17

作者：

Bardeen, W

Duncan, A

Eichten, E

Thacker, H

机构：

[1] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[2] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15620 USA

[3] Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA

来源：

PHYSICAL REVIEW D | 1998年 / 57卷 / 07期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.57.3890

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The spectral properties of the Wilson-Dirac operator in 2-dimensional QED responsible for the appearance of exceptional configurations in quenched simulations are studied in detail. The mass singularity structure of the quenched functional integral is shown to be extremely complicated, with multiple branch points and cuts. The connection of lattice topological charge and exactly real eigenmodes is explored using cooling techniques. The lattice volume and spacing dependence of these modes is studied, as is the effect of clover improvement of the action. A recently proposed modified quenched approximation is applied to the study of meson correlators, and the results compared with both naive quenched and full dynamical calculations of the same quantity. [S0056-2821(98)02507-7].

引用

页码：3890 / 3901

页数：12

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