arXiv 0912.13742009-12-07hep-lat

状态方程与QCD的有限温度相变

Equation of State and the Finite Temperature Transition in QCD

Rajan Gupta

备注：: Invited Talk at DPF 2009 Conference, Detroit, MI, July 27-31, 2009

摘要：

本次演讲提供了一个总结的结果，通过HotQCD合作的状态方程和交叉过渡在2+1味QCD。我们研究了体积热力学量--能量密度、压力、熵密度和140 < T < 540 MeV温度范围内的声速。这些结果是在时间尺寸为N_tau = 6和8的格点上，用两种改进的交错费米子作用量asqtad和p4得到的。我们最广泛的结果是两个简并轻夸克的质量设置为m_l = 0.1 m_s，对应于Goldstone π质量m_pi在220-260 MeV之间。在这些模拟中，奇异夸克的质量被调整到它的物理值，恒定的m_l/m_s值定义了恒定的物理线。我们还总结了当前状态的手征和decenfining物理学敏感的观测结果-光和奇怪的夸克数的磁化率，手征凝聚体和它的磁化率，和重整化Polyakov环。我们的结果表明，解除禁闭和手征对称性恢复发生在同一个狭窄的温度区间。

英文摘要：

This talk provides a summary of the results obtained by the HotQCD collaboration on the equation of state and the crossover transition in 2+1 flavor QCD. We investigate bulk thermodynamic quantities - energy density, pressure, entropy density, and the speed of sound over the temperature range 140 < T < 540 MeV. These results have been obtained on lattices of temporal size N_tau = 6 and 8 and with two improved staggered fermion actions, asqtad and p4. Our most extensive results are with masses of the two degenerate light quarks set at m_l = 0.1 m_s corresponding to the Goldstone pion mass m_pi between 220-260 MeV. In these simulations, the strange quark mass is tuned to its physical value and constant values of m_l/m_s define lines of constant physics. We also summarize the current state of results on observables sensitive to the chiral and deconfining physics -- the light and strange quark number susceptibilities, the chiral condensate and its susceptibility, and the renormalized Polyakov loop. Our results indicate that the deconfinement and chiral symmetry restoration occur in the same narrow temperature interval.

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英文摘要：

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