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Pressure and Spectral Density of Fermions at Finite Temperature |
| HOU De-fu1,2;U. Heinz2;LI Jia-rong1 |
| 1Institute of Particle Physics, Huazhong Normal University, Wuhan 430079
2Institut fiir Theoretische Physik, Universitat Regensburg, D-93040 Regensburg, Germany
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| Cite this article: |
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HOU De-fu, U. Heinz, LI Jia-rong 1999 Chin. Phys. Lett. 16 709-711 |
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Abstract The pressure of a fermion system is expressed as a mass integral over the full two-point spectral densities within the real time formalism by use of the Keldysh representation for the propagators. This simplifies the calculation significantly and allows a Dyson resummation. The expression is used to demonstrate that potential infrared divergences are rendered harmless. We apply it to check the pressures of an ideal fermion gas and of a chemically non-equilibrated quantum chromodynamics plasma.
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| Keywords:
11.10.Wx
12.38.Cy
12.38.Mh
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Published: 01 October 1999
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| PACS: |
11.10.Wx
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(Finite-temperature field theory)
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12.38.Cy
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(Summation of perturbation theory)
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12.38.Mh
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(Quark-gluon plasma)
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