arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0905.0364hep-ph
收藏

位力展开的QCD状态方程

QCD equation of state in a virial expansion

S. Mattiello, W. Cassing

摘要:

我们描述了最近的三味QCD晶格数据的压力,声速和相互作用措施在非零温度和消失的化学势维里膨胀。对于退禁闭阶段,我们使用一个唯象模型,其中包括nonperturbative从二维胶子凝聚,再现淬火QCD的自由能很好的影响。强子相的参数化广义共振气体模型。此外,我们将这种方法扩展到有限夸克密度引入一个明确的$μ$依赖的相互作用。计算了压强、夸克数密度、熵和能量密度,并与晶格计算结果进行了比较。此外,我们通过计算等压线和等熵线以及($T, μ_q $)平面中的临界端点来研究相图的结构。

英文摘要:

We describe recent three-flavor QCD lattice data for the pressure, speed of soun d and interaction measure at nonzero temperature and vanishing chemical potentia l within a virial expansion. For the deconfined phase we use a phenomenological model which includes non-pert urbative effects from dimension two gluon condensates that reproduce the free en ergy of quenched QCD very well. The hadronic phase is parameterized by a generalized resonance-gas model. Furthermore, we extend this approach to finite quark densities introducing an ex plicit $μ$-dependence of the interaction. We calculate pressure, quark-number density, entropy and energy density and compare to results of lattice calculatio ns. We, additionally, investigate the structure of the phase diagram by calculating the isobaric and isentropic lines as well as the critical endpoint in the ($T, μ_q $)-plane.

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。

↑