Color Superconductivity and Charge Neutrality in Yukawa Theory.
Color Superconductivity and Charge Neutrality in Yukawa Theory.
复制标题
汤川理论中的彩色超导性和电荷中性。
DOI：
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发表时间：
2017
影响因子：
8.6
通讯作者：
Andreas Windisch
中科院分区：
文献类型：
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作者：
M. Alford;Kamal Pangeni;Andreas Windisch
一般认为，当两个不同种类的费米子之间发生库珀配对时，它们的费米面被锁定在一起，使得所得到的状态保持“中性”，两个种类的数密度相等，即使受到耦合到数密度差的化学势的影响。这种信念是基于零程相互作用模型中的平均场计算，其中异常自能独立于能量和动量。跟踪早期报道的偏离中性的Dyson-Schwinger计算的色味锁夸克物质，我们调查的中性的两种凝聚体使用汤川模型，具有有限范围的相互作用。在平均场计算中，我们得到了自能的全部能量-动量依赖性，并发现当库珀配对相受到依赖于物种的化学势的应力时，能量依赖性导致了库珀配对相的布居不平衡。这为夸克物质的色味锁定相位可能不是绝缘体的建议提供了一些支持。
It is generally believed that when Cooper pairing occurs between two different species of fermions, their Fermi surfaces become locked together so that the resultant state remains "neutral," with equal number densities of the two species, even when subjected to a chemical potential that couples to the difference in number densities. This belief is based on mean-field calculations in models with a zero-range interaction, where the anomalous self-energy is independent of energy and momentum. Following up on an early report of a deviation from neutrality in a Dyson-Schwinger calculation of color-flavor-locked quark matter, we investigate the neutrality of a two-species condensate using a Yukawa model which has a finite-range interaction. In a mean field calculation we obtain the full energy-momentum dependence of the self-energy and find that the energy dependence leads to a population imbalance in the Cooper-paired phase when it is stressed by a species-dependent chemical potential. This gives some support to the suggestion that the color-flavor-locked phase of quark matter might not be an insulator.