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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2501.04560 |
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| _version_ | 1866929682902941696 |
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| author | Zhang, Zhao Zhao, Wenhao |
| author_facet | Zhang, Zhao Zhao, Wenhao |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_04560 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Properties of QCD axion in two-flavor color superconductive matter with massive quarks Zhang, Zhao Zhao, Wenhao High Energy Physics - Phenomenology 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. |
| title | Properties of QCD axion in two-flavor color superconductive matter with massive quarks |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.04560 |