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arXiv 1502.05969hep-phnucl-th
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有限重子密度下QCD相变的有效模型

An effective model for the QCD phase transitions at finite baryon density

Sanjin Benic, Igor Mishustin, Chihiro Sasaki

备注：
References added, some points further elaborated, main conclusions unchanged, accepted in Phys Rev D
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摘要：

我们引入了一个有效的夸克-介子-核子模型来研究有限重子密度下的QCD相变。在手征线性西格玛模型的统一框架内描述了核子和夸克的自由度。通过简单修改核子和夸克的分布函数，引入一个附加的辅助场--袋场，来模拟退禁闭跃迁。袋场在核子自由度和夸克自由度之间的转换中起着关键作用。该模型预测，手性和解除限制相变总是分开的。根据模型参数，手征跃迁发生在$(1.5-15.5)n_0$的重子密度范围内，而解除禁闭跃迁发生在$5 n_0$以上，其中$n_0$是饱和密度。

英文摘要：

We introduce an effective quark-meson-nucleon model for the QCD phase transitions at finite baryon density. The nucleon and the quark degrees of freedom are described within a unified framework of a chiral linear sigma model. The deconfinement transition is modeled through a simple modification of the distribution functions of nucleons and quarks, where an additional auxiliary field, the bag field, is introduced. The bag field plays a key role in converting between the nucleon and the quark degrees of freedom. The model predicts that the chiral and the deconfinement phase transitions are always separated. Depending on the model parameters, the chiral transition occurs in the baryon density range of $(1.5-15.5)n_0$, while the deconfinement transition occurs above $5 n_0$, where $n_0$ is the saturation density.

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