| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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An Improved Quasi-particle Model Framework for Quark-Gluon Plasma from the Path Integral Formalism |
| CAO Jing1, ZHAO A-Meng1, SUN Wei-Min1,2, ZONG Hong-Shi1,2** |
1Department of Physics, Nanjing University, Nanjing 210093
2Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing 210093 |
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| Cite this article: |
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CAO Jing, ZHAO A-Meng, SUN Wei-Min et al 2012 Chin. Phys. Lett. 29 061201 |
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Abstract An improved framework for the quasi-particle model is presented. Unlike the previous approach of establishing the quasi-particle model, we introduce a classical background field (it is allowed to depend on temperature) to deal with the infinity of thermal vacuum energy which exists in previous quasi-particle models. After taking into account the effect of this classical background field, the partition function of the quasi-particle system can be well defined. Based on this and following the standard ensemble theory, we construct a thermodynamically consistent quasi-particle model without the need to reformulate the statistical mechanics or the thermodynamic consistency relation. It is shown that our method is general and can be generalized to the case in which the effective mass depends not only on the temperature but also on the chemical potential.
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| Keywords:
12.38.Mh
51.30.+i
52.25.Kn
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Received: 29 February 2012
Published: 31 May 2012
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| PACS: |
12.38.Mh
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(Quark-gluon plasma)
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51.30.+i
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(Thermodynamic properties, equations of state)
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52.25.Kn
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(Thermodynamics of plasmas)
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