# Quark spectral density and a strongly-coupled quark-gluon plasma.

## Abstract

The maximum entropy method is used to compute the dressed-quark spectral density from the self-consistent numerical solution of a rainbow truncation of QCD's gap equation at temperatures above that for which chiral symmetry is restored. In addition to the normal and plasmino modes, the spectral function also exhibits an essentially nonperturbative zero mode for temperatures extending to 1.4-1.8 times the critical temperature, T{sub c}. In the neighborhood of T{sub c}, this long-wavelength mode contains the bulk of the spectral strength and as long as this mode persists, the system may fairly be described as a strongly-coupled state of matter.

- Authors:

- (Physics)
- (

- Publication Date:

- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC); National Natural Sciece Foundation of China

- OSTI Identifier:
- 1021313

- Report Number(s):
- ANL/PHY/JA-68299

Journal ID: 1550-7998; TRN: US201116%%709

- DOE Contract Number:
- DE-AC02-06CH11357

- Resource Type:
- Journal Article

- Journal Name:
- Phys. Rev. D

- Additional Journal Information:
- Journal Volume: 84; Journal Issue: 1 ; Jul. 13, 2011

- Country of Publication:
- United States

- Language:
- ENGLISH

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHIRAL SYMMETRY; CRITICAL TEMPERATURE; ENTROPY; EQUATIONS; GLUONS; NUMERICAL SOLUTION; QUANTUM CHROMODYNAMICS; QUARK MATTER; QUARKS; SPECTRAL DENSITY; SPECTRAL FUNCTIONS

### Citation Formats

```
Qin, S., Chang, L., Liu, Y., Roberts, C. D., Peking Univ.), Inst. of Applied Physics and Computational Mathematics), and National Lab. of Heavy Ion Accelerator).
```*Quark spectral density and a strongly-coupled quark-gluon plasma.*. United States: N. p., 2011.
Web. doi:10.1103/PhysRevD.84.014017.

```
Qin, S., Chang, L., Liu, Y., Roberts, C. D., Peking Univ.), Inst. of Applied Physics and Computational Mathematics), & National Lab. of Heavy Ion Accelerator).
```*Quark spectral density and a strongly-coupled quark-gluon plasma.*. United States. doi:10.1103/PhysRevD.84.014017.

```
Qin, S., Chang, L., Liu, Y., Roberts, C. D., Peking Univ.), Inst. of Applied Physics and Computational Mathematics), and National Lab. of Heavy Ion Accelerator). Wed .
"Quark spectral density and a strongly-coupled quark-gluon plasma.". United States. doi:10.1103/PhysRevD.84.014017.
```

```
@article{osti_1021313,
```

title = {Quark spectral density and a strongly-coupled quark-gluon plasma.},

author = {Qin, S. and Chang, L. and Liu, Y. and Roberts, C. D. and Peking Univ.) and Inst. of Applied Physics and Computational Mathematics) and National Lab. of Heavy Ion Accelerator)},

abstractNote = {The maximum entropy method is used to compute the dressed-quark spectral density from the self-consistent numerical solution of a rainbow truncation of QCD's gap equation at temperatures above that for which chiral symmetry is restored. In addition to the normal and plasmino modes, the spectral function also exhibits an essentially nonperturbative zero mode for temperatures extending to 1.4-1.8 times the critical temperature, T{sub c}. In the neighborhood of T{sub c}, this long-wavelength mode contains the bulk of the spectral strength and as long as this mode persists, the system may fairly be described as a strongly-coupled state of matter.},

doi = {10.1103/PhysRevD.84.014017},

journal = {Phys. Rev. D},

number = 1 ; Jul. 13, 2011,

volume = 84,

place = {United States},

year = {2011},

month = {7}

}

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