Non-zero density QCD by the Taylor expansion method: The isentropic equation of state, hadronic fluctuations and more
Non-zero density QCD by the Taylor expansion method: The isentropic equation of state, hadronic fluctuations and more
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采用泰勒展开法的非零密度 QCD：等熵状态方程、强子涨落等
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
for RBC
中科院分区：
文献类型：
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作者：
C. Miao;C. Schmidt;for RBC
讨论了非零重子化学势（$\mu_B$）的泰勒展开方法，给出了$\mu_B$中压力和能量密度的六阶展开系数的结果.在时间尺度为4和6个时间片的格点上，用改进的交错费米子（p4 fat 3）和近似物理质量的（2+1）味进行了计算.我们利用这些展开系数，在每重子数熵为常数的直线上和各种不同的强子涨落下，构造了等熵状态方程。此外，我们还估计了展开式的曲率半径，这可以看作是分析QCD相图结构的一种方法。
We discuss the Taylor expansion approach to non-zero baryon chemical potential ($\mu_B$) and present results on expanion coefficients of the pressure and energy density up to the 6-th order in $\mu_B$. Calculations have been performed with (2+1)-flavor of improved staggerd fermions (p4fat3) and almost physical masses on lattices with temporal extent of four and six time slices. We use the expansion coefficients to construct the isentropic equation of state on lines of constant entropy per baryon number and various different hadronic fluctuations. Furthermore, we estimate the radius of convegence of our expansion, which can be seen as a method to analyze the structure of the QCD phase diagram.