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arXiv 0912.2541hep-phhep-latnucl-exnucl-th
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QCD状态方程与强子共振气体

QCD Equation of State and Hadron Resonance Gas

P. Huovinen, P. Petreczky

摘要:

我们比较了格点量子色动力学计算的径迹反常、奇异性和重子数涨落与基于强子共振气体模型的预期结果。我们发现强子共振气体与晶格数据之间存在着显著的差异。这种差异大大减少,如果修改强子谱,以考虑到晶格计算中使用的夸克质量的较大值,以及有限的晶格间距的错误。我们还给出了一个简单的QCD状态方程参数化,它将低温强子共振气体和高温格点量子色动力学结合起来。我们比较这种参数化与其他参数化的状态方程中使用的流体动力学模型,并讨论不同的状态方程的流体动力学流动的差异。

英文摘要:

We compare the trace anomaly, strangeness and baryon number fluctuations calculated in lattice QCD with expectations based on hadron resonance gas model. We find that there is a significant discrepancy between the hadron resonance gas and the lattice data. This discrepancy is largely reduced if the hadron spectrum is modified to take into account the larger values of the quark mass used in lattice calculations as well as the finite lattice spacing errors. We also give a simple parametrization of QCD equation of state, which combines hadron resonance gas at low temperatures with lattice QCD at high temperatures. We compare this parametrization with other parametrizations of the equation of state used in hydrodynamical models and discuss differences in hydrodynamic flow for different equations of state.

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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