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arXiv 0802.2396hep-ph
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三味Polyakov环NJL模型中的强制中性和色味解锁

Enforced neutrality and color-flavor unlocking in the three-flavor Polyakov-loop NJL model

H. Abuki, M. Ciminale, R. Gatto, G. Nardulli, M. Ruggieri

摘要:

研究了电荷中性对三味PNJL模型相结构的影响。我们指出,在传统的PNJL模型在有限密度的色中性是失踪,因为威尔逊线作为一个外部的“有色”场耦合到动力学夸克。在本文中,我们简要地假设,该模型可能仍然适用。为了得到色中性,我们必须允许色的化学势不为零。我们研究了夸克物质在$(T,m_s^2/μ)$ -平面上的相图如何受到中性和Polyakov圈动力学的影响。虽然这两种效应以非线性方式相关,但Polyakov环的影响在$T$方向上是显著的,而施加中性在$m_s^2/μ$方向上带来显著的影响。特别地,我们发现了一个新的解锁跃迁,当温度升高时,即使在手征SU(3)极限。我们澄清如何以及为什么这是可能的,一旦考虑到的动力学的彩色Polyakov循环。我们还成功地给出了在Polyakov圈存在的情况下,从双味对(2SC)到未配对夸克物质跃迁的$T_c$的解析表达式。

英文摘要:

We study how the charge neutrality affects the phase structure of three-flavor PNJL model. We point out that, within the conventional PNJL model at finite density the color neutrality is missing because the Wilson line serves as an external ``colored'' field coupled to dynamical quarks. In this paper we heuristically assume that the model may still be applicable. To get color neutrality one has then to allow non vanishing color chemical potentials. We study how the quark matter phase diagram in $(T,m_s^2/μ)$-plane is affected by imposing neutrality and by including the Polyakov loop dynamics. Although these two effects are correlated in a nonlinear way, the impact of the Polyakov loop turns out to be significant in the $T$ direction, while imposing neutrality brings a remarkable effect in the $m_s^2/μ$ direction. In particular, we find a novel unlocking transition, when the temperature is increased, even in the chiral SU(3) limit. We clarify how and why this is possible once the dynamics of the colored Polyakov loop is taken into account. Also we succeed in giving an analytic expression for $T_c$ for the transition from two-flavor pairing (2SC) to unpaired quark matter in the presence of the Polyakov loop.

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