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arXiv 2103.08146hep-phnucl-th
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具有临界点的QCD奇异中性状态方程

Strangeness neutral equation of state for QCD with a critical point

J. M. Stafford, D. Mroczek, A. R. Nava Acuna, J. Noronha-Hostler, P. Parotto, D. R. P. Price, C. Ratti

摘要:

我们提出了一个奇异中性状态方程的QCD表现出临界行为和匹配的泰勒展开的热力学变量高达四阶$μ_B/T$的格点量子色动力学结果。它与SMASH强子输运方法兼容,并具有与RHIC束能量扫描第二阶段相关的温度和重子化学势范围。我们提供了一个更新版本的软件BES-EoS,它产生一个状态方程的QCD,其中包括一个临界点的三维伊辛模型普适类。这个新的版本还包括等熵抛射和关键的相关长度的贡献。由于重离子碰撞具有零的整体净奇异度密度和固定的电荷与重子数之比,因此BES-EoS更适合描述该系统。与以前版本的EoS的比较进行了深入的讨论。

英文摘要:

We present a strangeness-neutral equation of state for QCD that exhibits critical behavior and matches lattice QCD results for the Taylor-expanded thermodynamic variables up to fourth-order in $μ_B/T$. It is compatible with the SMASH hadronic transport approach and has a range of temperatures and baryonic chemical potentials relevant for phase II of the Beam Energy Scan at RHIC. We provide an updated version of the software BES-EoS, which produces an equation of state for QCD that includes a critical point in the 3D Ising model universality class. This new version also includes isentropic trejectories and the critical contribution to the correlation length. Since heavy-ion collisions have zero global net-strangeness density and a fixed ratio of electric charge to baryon number, the BES-EoS is more suitable to describe this system. Comparison with the previous version of the EoS is thoroughly discussed.

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