# Are Topological Charge Fluctuations in QCD Instanton Dominated?

## Abstract

We consider a recent proposal by Horvath et al. to address the question whether topological charge fluctuations in QCD are instanton dominated via the response of fermions using lattice fermions with exact chiral symmetry, the overlap fermions. Considering several volumes and lattice spacings we find strong evidence for chirality of a finite density of low-lying eigenvectors of the overlap-Dirac operator in the regions where these modes are peaked. This result suggests instanton dominance of topological charge fluctuations in quenched QCD.

- Authors:

- Publication Date:

- Research Org.:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (US)

- Sponsoring Org.:
- USDOE Office of Energy Research (ER) (US)

- OSTI Identifier:
- 780797

- Report Number(s):
- JLAB-THY-01-13; DOE/ER/40150-1841; hep-lat/0105004; FSU-CSIT-01-24

TRN: US0102634

- DOE Contract Number:
- AC05-84ER40150

- Resource Type:
- Journal Article

- Journal Name:
- submitted to Phys Rev

- Additional Journal Information:
- Journal Volume: D; Other Information: Submitted to Phys. Rev., Volume D; PBD: 1 May 2001

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHIRAL SYMMETRY; CHIRALITY; EIGENVECTORS; FERMIONS; FLUCTUATIONS; INSTANTONS; QUANTUM CHROMODYNAMICS; DIRAC OPERATORS

### Citation Formats

```
Edwards, Robert G, and Heller, Urs M.
```*Are Topological Charge Fluctuations in QCD Instanton Dominated?*. United States: N. p., 2001.
Web.

```
Edwards, Robert G, & Heller, Urs M.
```*Are Topological Charge Fluctuations in QCD Instanton Dominated?*. United States.

```
Edwards, Robert G, and Heller, Urs M. Tue .
"Are Topological Charge Fluctuations in QCD Instanton Dominated?". United States. https://www.osti.gov/servlets/purl/780797.
```

```
@article{osti_780797,
```

title = {Are Topological Charge Fluctuations in QCD Instanton Dominated?},

author = {Edwards, Robert G and Heller, Urs M},

abstractNote = {We consider a recent proposal by Horvath et al. to address the question whether topological charge fluctuations in QCD are instanton dominated via the response of fermions using lattice fermions with exact chiral symmetry, the overlap fermions. Considering several volumes and lattice spacings we find strong evidence for chirality of a finite density of low-lying eigenvectors of the overlap-Dirac operator in the regions where these modes are peaked. This result suggests instanton dominance of topological charge fluctuations in quenched QCD.},

doi = {},

journal = {submitted to Phys Rev},

number = ,

volume = D,

place = {United States},

year = {2001},

month = {5}

}

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