Entropy puzzle and the quark combination model
Entropy puzzle and the quark combination model
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DOI：
10.1103/physrevc.81.057901
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发表时间：
2010-01
影响因子：
3.1
通讯作者：
Jun Song;Z. Liang;Yu-xin Liu;Feng-lan Shao;Qun Wang
中科院分区：
文献类型：
--
作者：
Jun Song;Z. Liang;Yu-xin Liu;Feng-lan Shao;Qun Wang
我们用两种方法，Duhem-Gibbs关系和粒子相空间分布的熵公式，计算夸克组合模型中的熵。从Duhem-Gibbs关系中提取的系统的熵被发现增加强子化，如果强子相的平均温度低于夸克相的。当强子相体积大于夸克相体积的2.5-3.0倍时，熵的增加也可以从熵公式中得到证实。因此，熵在结合过程中是增加还是减少取决于结合前后的温度，以及系统在结合过程中经历了多大的膨胀。本研究为阐明夸克组合模型中的熵问题提供了一个例子。
We use two available methods, the Duhem-Gibbs relation and the entropy formula in terms of particle phase-space distributions, to calculate the entropy in a quark combination model. The entropy of the system extracted from the Duhem-Gibbs relation is found to increase in hadronization if the average temperature of the hadronic phase is lower than that of the quark phase. The increase of the entropy can also be confirmed from the entropy formula if the volume of the hadronic phase is larger than 2.5-3.0 times that of the quark phase. So whether the entropy increases or decreases during combination depends on the temperature before and after combination and on how much expansion the system undergoes during combination. The current study provides an example to shed light on the entropy issue in the quark combination model.