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arXiv 1306.6188hep-phhep-latnucl-th
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净重子密度为零时基于格点量子色动力学的状态方程

Lattice QCD-based equations of state at vanishing net-baryon density

M. Bluhm, P. Alba, W. Alberico, A. Beraudo, C. Ratti

摘要:

我们提出了现实的状态方程QCD物质在消失的净重子密度嵌入最近的格点量子色动力学结果在高温下结合强子共振气体模型在低温下,限制相。在后者中,我们允许部分化学平衡的实施,其中粒子比例在化学冻结时是固定的,因此更接近实验情况的描述是可能的。鉴于目前的不确定性,在确定化学冻结温度的第一原理格点量子色动力学计算,我们认为不同的值在预期的范围内。相应的状态方程可用于LHC和最高RHIC束流能量下相对论性重离子碰撞的流体动力学模拟。我们的结果作为能量密度的函数也提供了适当的参数化。

英文摘要:

We present realistic equations of state for QCD matter at vanishing net-baryon density which embed recent lattice QCD results at high temperatures combined with a hadron resonance gas model in the low-temperature, confined phase. In the latter, we allow an implementation of partial chemical equilibrium, in which particle ratios are fixed at the chemical freeze-out, so that a description closer to the experimental situation is possible. Given the present uncertainty in the determination of the chemical freeze-out temperature from first-principle lattice QCD calculations, we consider different values within the expected range. The corresponding equations of state can be applied in the hydrodynamic modeling of relativistic heavy-ion collisions at the LHC and at the highest RHIC beam energies. Suitable parametrizations of our results as functions of the energy density are also provided.

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