# Quasiparticle description of (2+1)- flavor lattice QCD equation of state

## Abstract

A quasiparticle model has been employed to describe the (2+1)-flavor lattice QCD equation of state with physical quark masses. The interaction part of the equation of state has been mapped to the effective fugacities of otherwise noninteracting quasigluons and quasiquarks. The mapping is found to be exact for the equation of state. The model leads to nontrivial dispersion relations for quasipartons. The dispersion relations, effective quasiparticle number densities, and trace anomaly have been investigated employing the model. A virial expansion for the equation of state has further been obtained to investigate the role of interactions in quark-gluon plasma. Finally, Debye screening in quark-gluon plasma has been studied employing the model.

- Authors:

- Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai-400005 (India)
- Department of Physics, Indian Institute of Technology Kanpur, Kanpur-208 016 (India)

- Publication Date:

- OSTI Identifier:
- 21607771

- Resource Type:
- Journal Article

- Journal Name:
- Physical Review. D, Particles Fields

- Additional Journal Information:
- Journal Volume: 84; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.84.074013; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DENSITY; DISPERSION RELATIONS; EQUATIONS OF STATE; EXPANSION; FLAVOR MODEL; INTERACTIONS; LATTICE FIELD THEORY; MASS; QUANTUM CHROMODYNAMICS; QUARK MATTER; QUARKS; QUASIPARTICLE-PHONON MODEL; SCREENING; COMPOSITE MODELS; CONSTRUCTIVE FIELD THEORY; EQUATIONS; FERMIONS; FIELD THEORIES; MATHEMATICAL MODELS; MATTER; NUCLEAR MODELS; PARTICLE MODELS; PHYSICAL PROPERTIES; QUANTUM FIELD THEORY; QUARK MODEL

### Citation Formats

```
Chandra, Vinod, and Ravishankar, V.
```*Quasiparticle description of (2+1)- flavor lattice QCD equation of state*. United States: N. p., 2011.
Web. doi:10.1103/PHYSREVD.84.074013.

```
Chandra, Vinod, & Ravishankar, V.
```*Quasiparticle description of (2+1)- flavor lattice QCD equation of state*. United States. doi:10.1103/PHYSREVD.84.074013.

```
Chandra, Vinod, and Ravishankar, V. Sat .
"Quasiparticle description of (2+1)- flavor lattice QCD equation of state". United States. doi:10.1103/PHYSREVD.84.074013.
```

```
@article{osti_21607771,
```

title = {Quasiparticle description of (2+1)- flavor lattice QCD equation of state},

author = {Chandra, Vinod and Ravishankar, V.},

abstractNote = {A quasiparticle model has been employed to describe the (2+1)-flavor lattice QCD equation of state with physical quark masses. The interaction part of the equation of state has been mapped to the effective fugacities of otherwise noninteracting quasigluons and quasiquarks. The mapping is found to be exact for the equation of state. The model leads to nontrivial dispersion relations for quasipartons. The dispersion relations, effective quasiparticle number densities, and trace anomaly have been investigated employing the model. A virial expansion for the equation of state has further been obtained to investigate the role of interactions in quark-gluon plasma. Finally, Debye screening in quark-gluon plasma has been studied employing the model.},

doi = {10.1103/PHYSREVD.84.074013},

journal = {Physical Review. D, Particles Fields},

issn = {0556-2821},

number = 7,

volume = 84,

place = {United States},

year = {2011},

month = {10}

}