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arXiv 2501.04560hep-ph
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QCD轴子在具有大质量夸克的两味色超导物质中的性质

Properties of QCD axion in two-flavor color superconductive matter with massive quarks

Zhao Zhang, Wenhao Zhao

AI总结:

本研究在NJL模型中考虑瞬子诱导相互作用,研究了两味色超导相中QCD轴子的性质,发现色超导增强轴子质量与自耦合,轴子势呈现π周期,并计算了轴子畴壁的表面张力。

摘要:

我们在Nambu-Jona-Lasinio模型中,通过同时考虑夸克-反夸克和双夸克通道中的标量和赝标量凝聚,研究了低温和中等密度下QCD轴子的性质,其中包含了瞬子诱导的相互作用。我们在非零θ角 $θ=a/f_a$ 下推导了具有四类凝聚的夸克的解析色散关系。在手征对称性破缺和两味色超导相中,我们计算了轴子质量、四次自耦合以及轴子势。使用常用的模型参数,我们发现由于色超导的出现,手征相变不仅没有导致轴子质量和自耦合的显著降低,反而使它们明显增强。作为 $θ$ 的函数,轴子势表现出适当的 $π$ 周期,这与不考虑色超导的情况有很大不同。在存在色超导的情况下,我们还计算了轴子畴壁的表面张力。

英文摘要:

We investigate the properties of QCD axion at low temperature and moderate density in the Nambu-Jona-Lasinio model with instanton induced interactions by simultaneously considering the scalar and pseudo-scalar condensates in both quark-antiquark and diquark channels. We derive the analytical dispersion relations of quarks with four-type condensates at nonzero theta angle $θ=a/f_a$. The axion mass, quartic self-coupling, and the axion potential are calculated in both the chiral symmetry breaking and two-flavor color superconducting phases. Using the commonly adopted model parameters, we find that due to the emergence of color superconductivity, the chiral phase transition not only does not lead to a significant decrease in axion mass and self-coupling, but rather results in an obvious enhancement of them. As a $θ$ function, the axion potential exhibits an appropriate period of $π$, which is quite different from the case without considering the color superconductivity. The surface tension of axion domain wall is also calculated in the presence of color superconductivity.

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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