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arXiv 0810.5510hep-ph
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夸克物质色香味锁定相中的K介子凝聚、Goldstone定理和2PI Hartree近似

Kaon condensation in the color-flavor-locked phase of quark matter, the Goldstone theorem, and the 2PI Hartree approximation

Jens O. Andersen, Lars E. Leganger

摘要:

在非常高的密度下,QCD处于色味锁定相,这是一种色超导相。双夸克凝聚打破了手征对称性,就像在真空QCD中打破手征对称性一样,并产生了八重态的伪戈德斯通玻色子和超流模。其中最轻的是带电和中性的K介子。对于超导能隙以下的能量,用具有化学势的$O(2)\times O(2)$对称有效标量场理论描述K介子。我们用这个有效的理论研究了K介子的玻色凝聚及其性质随温度和化学势的变化。在Hartree近似中,我们使用2粒子不可约有效作用量形式。详细研究了能隙方程和有效势的重整化,证明了平衡项与温度和化学势无关,确定了相图和介质相关的准粒子质量。证明了Goldstone定理在一个很好的近似下是满足的。施加电荷中性的影响进行了检查。

英文摘要:

At very high densities, QCD is in the color-flavor locked phase, which is a color-superconducting phase. The diquark condensates break chiral symmetry in the same way as it is broken in vacuum QCD and gives rise to an octet of pseudo-Goldstone bosons and a superfluid mode. The lightest of these are the charged and neutral kaons. For energies below the superconducting gap, the kaons are described by an $O(2)\times O(2)$-symmetric effective scalar field theory with chemical potentials. We use this effective theory to study Bose-condensation of kaons and their properties as functions of the temperature and the chemical potentials. We use the 2-particle irreducible effective action formalism in the Hartree approximation. The renormalization of the gap equations and the effective potential is studied in detail and we show that the counterterms are independent of temperature and chemical potentials.We determine the phase diagram and the medium-dependent quasiparticle masses. It is shown that the Goldstone theorem is satisfied to a very goodapproximation. The effects of imposing electric charge neutrality is examined as well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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