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arXiv 1306.3352hep-phnucl-th
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含夸克自由度手征强子模型的QCD状态方程

QCD Equation of State From a Chiral Hadronic Model Including Quark Degrees of Freedom

Philip Rau, Jan Steinheimer, Stefan Schramm, Horst Stöcker

摘要:

本文提出了一个有效的强相互作用物质模型和QCD状态方程。该模型包括强子和夸克的自由度,并考虑了手征对称性恢复的过渡以及解除禁闭的相变。在低温$T$和重子密度$ρ_B$下,使用SU(3)风味sigma-omega模型描述强子共振气体,并引入夸克相,类似于更高$T$和$ρ_B$的PNJL模型。这样,正确的渐近自由度可用于广泛的$T$和$ρ_B$。在这里,这个模型的手性和解除限制相变和热力学模型属性的结果。过渡区的大强子共振多重数强调了重质量共振态在该区域的重要性及其对手征跃迁行为的影响。结果表明,小化学势下QCD物质的相图与最新的格点量子色动力学和热模型结果一致。

英文摘要:

This work presents an effective model for strongly interacting matter and the QCD equation of state (EoS). The model includes both hadron and quark degrees of freedom and takes into account the transition of chiral symmetry restoration as well as the deconfinement phase transition. At low temperatures $T$ and baryonic densities $ρ_B$ a hadron resonance gas is described using a SU(3)-flavor sigma-omega model and a quark phase is introduced in analogy to PNJL models for higher $T$ and $ρ_B$. In this way, the correct asymptotic degrees of freedom are used in a wide range of $T$ and $ρ_B$. Here, results of this model concerning the chiral and deconfinement phase transitions and thermodynamic model properties are presented. Large hadron resonance multiplicities in the transition region emphasize the importance of heavy-mass resonance states in this region and their impact on the chiral transition behavior. The resulting phase diagram of QCD matter at small chemical potentials is in line with latest lattice QCD and thermal model results.

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。

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