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arXiv 0810.4024hep-lathep-ph
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零密度和非零密度下的QCD热力学

QCD thermodynamics at zero and non-zero density

Christian Schmidt, for RBC-Bielefeld, HotQCD Collaborations

摘要:

我们给出了用两种不同的改进的动力学交错费米子作用量和几乎物理的夸克质量得到的QCD状态方程的结果。晶格截止效应进行了详细讨论,因为三种不同的晶格间距的结果是现在可用的,即结果已经获得了时间范围为$N_τ=4,6$和8的晶格。此外,我们还讨论了通过压力展开的方法,对非零重子化学势的泰勒展开方法。我们用展开系数计算了强子荷之间的各种涨落和关联。我们发现,相关性再现的定性行为的共振气体模型低于$T_c$,并开始同意自由气体预测$T\gsim 1.5T_c$。

英文摘要:

We present results on the QCD equation of state, obtained with two different improved dynamical staggered fermion actions and almost physical quark masses. Lattice cut-off effects are discussed in detail as results for three different lattice spacings are available now, i.e. results have been obtained on lattices with temporal extent of $N_τ=4,6$ and 8. Furthermore we discuss the Taylor expansion approach to non-zero baryon chemical potential by means of an expansion of the pressure. We use the expansion coefficients to calculate various fluctuations and correlations among hadronic charges. We find that the correlations reproduce the qualitative behavior of the resonance gas model below $T_c$ and start to agree with the free gas predictions for $T\gsim 1.5T_c$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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