Quenched approximation artifacts: A study in two-dimensional QED
| Autor: | H. Thacker, William A. Bardeen, Anthony Duncan, Estia Eichten |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Physics
Nuclear and High Energy Physics Meson 010308 nuclear & particles physics High Energy Physics::Lattice Lattice field theory Quenched approximation 01 natural sciences Singularity Lattice (order) Lattice gauge theory Quantum mechanics 0103 physical sciences 010306 general physics Branch point Topological quantum number |
| Zdroj: | Physical Review D. 57:3890-3901 |
| ISSN: | 1089-4918 0556-2821 |
| DOI: | 10.1103/physrevd.57.3890 |
| Popis: | 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. {copyright} {ital 1998} {ital The American Physical Society} |
| Databáze: | OpenAIRE |
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