Equation of state in the pion condensation phase in asymmetric nuclear matter using a holographic QCD model
Equation of state in the pion condensation phase in asymmetric nuclear matter using a holographic QCD model
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DOI：
10.1103/physrevd.90.115027
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发表时间：
2014-07
影响因子：
5
通讯作者：
Hiroki Nishihara;M. Harada
中科院分区：
文献类型：
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作者：
Hiroki Nishihara;M. Harada
我们通过在红外边界引入重子电荷，使用全息 QCD 模型研究不对称核物质。我们首先表明，在正常强子相中，对称能及其斜率参数的预测值与经验值相当。我们发现，与纯介子物质相比，从正相到π介子凝聚相的相变被延迟：临界化学势大于纯介子物质获得的π介子质量。我们还表明，在π介子凝聚阶段，π介子对同位旋数密度的贡献随着化学势的增加而增加，而重子的贡献几乎恒定。此外，手性凝聚的值意味着手性对称性破缺的增强发生在不对称核物质中，就像在纯介子物质中一样。我们还讨论了如何理解基于隐藏局部对称性的 4 维手性拉格朗日（包括 rho 和 omega 介子）的延迟。
We study the asymmetric nuclear matter using a holographic QCD model by introducing a baryonic charge in the infrared boundary. We first show that, in the normal hadron phase, the predicted values of the symmetry energy and it's slope parameter are comparable with the empirical values. We find that the phase transition from the normal phase to the pion condensation phase is delayed compared with the pure mesonic matter: The critical chemical potential is larger than the pion mass which is obtained for the pure mesonic matter. We also show that, in the pion condensation phase, the pion contribution to the isospin number density increases with the chemical potential, while the baryonic contribution is almost constant. Furthermore, the value of chiral condensation implies that the enhancement of the chiral symmetry breaking occurs in the asymmetric nuclear matter as in the pure mesonic matter. We also give a discussion on how to understand the delay in terms of the 4-dimensional chiral Lagrangian including the rho and omega mesons based on the hidden local symmetry.