科研之友
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摘要
In this paper we calculate the thermodynamic quantities and bulk viscosity in a simple confining Dyson-Schwinger equation model of two-flavor QCD. Our results show that the velocity of sound shows a sharp increase around (T) over bar = T/eta similar to 0.1 (eta = 1.06 GeV) and at the phase transition temperature (T) over bar (c) = 1/2 pi approximate to 0.159 the derivative of the velocity with respect to T has a distinct change. It is also found that the trace anomaly increases sharply below the phase transition point and the bulk viscosity has a peak located at (T) over bar similar to 0.12 which is almost the same as the peak of the trace anomaly. A comparison of our results with those in the previous literature is given.
- 出版日期2010-6-28
- 单位南京大学
