The hot nonperturbative gluon plasma is an almost ideal colored liquid.
The hot nonperturbative gluon plasma is an almost ideal colored liquid.
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热的非微扰胶子等离子体是一种几乎理想的有色液体。
DOI：
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发表时间：
2005
影响因子：
8.6
通讯作者：
W. Cassing
中科院分区：
文献类型：
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作者：
A. Peshier;W. Cassing
我们用洛伦兹谱函数的广义准粒子方法研究了临界温度T_c以上胶子等离子体的性质。模型参数是通过对点阵QCD数据进行S熵的拟合来确定的。发现有效自由度相当重，且具有相当大的宽度。由于光谱宽度与相互作用速率密切相关，我们发现了一个与准粒子的典型距离平方相当的大的有效截面。这表明系统应该被视为液体，正如对等离子体参数伽马的估计所表明的那样。此外，在准粒子方法中，我们发现了一个非常低的粘性/熵比，在T&gT；1.05T时，ETa/S约为0.2，支持了最近在RHIC看到的近乎理想的夸克-胶子液体的猜想。
We study properties of a gluon plasma above the critical temperature Tc in a generalized quasiparticle approach with a Lorentz spectral function. The model parameters are determined by a fit of the entropy s to lattice QCD data. The effective degrees of freedom are found to be rather heavy and of a sizable width. With the spectral width being closely related to the interaction rate, we find a large effective cross section, which is comparable to the typical distance squared of the quasiparticles. This suggests that the system should be viewed as a liquid as also indicated by an estimate of the plasma parameter Gamma. Furthermore, within the quasiparticle approach we find a very low viscosity to entropy ratio, eta/s approximately 0.2 for T > 1.05 Tc, supporting the recent conjecture of an almost ideal quark-gluon liquid seen at RHIC.