Pion condensation in electrically neutral cold matter with finite baryon density
Pion condensation in electrically neutral cold matter with finite baryon density
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DOI：
10.1140/epjc/s2006-02527-5
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发表时间：
2005-10
期刊：
影响因子：
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通讯作者：
D. Ebert;K. Klimenko
中科院分区：
文献类型：
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作者：
D. Ebert;K. Klimenko
研究了在β-平衡状态下冷电中性致密重子物质中π介子凝聚现象的可能性。为简单起见，我们在 Nambu-Jona-Lasinio 模型的框架中进行考虑，该模型具有两种夸克风味，当前夸克质量为零，并且重子化学势值相当小，其中双夸克凝聚可以被忽略。使用两组模型参数。首先，实现了具有有限重子密度的π介子凝聚相。在此阶段，电子和π介子凝聚体都参与夸克电荷的中和。对于第二组模型参数，如果施加中性条件，π介子凝聚是不可能的。介子质量与夸克化学势的行为已经在电中性物质中进行了研究。
The possibility of the pion condensation phenomenon in cold and electrically neutral dense baryonic matter is investigated in β-equilibrium. For simplicity, the consideration is performed in the framework of a Nambu–Jona-Lasinio model with two quark flavors at zero current quark mass and for rather small values of the baryon chemical potential, where the diquark condensation might be ignored. Two sets of model parameters are used. For the first, the pion condensed phase with finite baryon density is realized. In this phase both electrons and the pion condensate take part in the neutralization of the quark electric charge. For the second set of model parameters, the pion condensation is impossible if the neutrality condition is imposed. The behavior of meson masses vs. quark chemical potential has been studied in electrically neutral matter.