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arXiv 2511.21995hep-phastro-ph.HEnucl-th
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QCD轴子与致密物质中域壁在紧凑恒星条件下的研究

QCD axions and domain walls in dense matter under compact stellar conditions

Hunan University of Science and Technology（湖南科技大学）；Beihang University（北京航空航天大学）；Fudan University（复旦大学）；University of Catania（卡塔尼亚大学）；Inner Mongolia Normal University（内蒙古师范大学）

Zhen-Yan Lu, Shu-Peng Wang, Qi Lu, Bo-Nan Zhang, Marco Ruggieri

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9 pages, 7 figures
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AI总结：

研究QCD轴子在致密物质中受温度和化学势影响的性质，发现临界点附近轴子自耦常数显著增强，可能影响致密星结构与稳定性。

摘要：

在紧凑恒星环境中，密集QCD物质的稳定性需要同时满足电中性和β平衡。在本工作中，我们研究了温度和有限化学势如何影响QCD拓扑和轴子性质，分析了在有和无电中性条件下的两种情况。我们的结果表明，拓扑易损性及轴子性质对Chiral相变临界行为高度敏感。特别是，轴子质量在临界点附近被强烈抑制，而轴子自耦常数则发展出显著的峰值，其大小取决于介质的温度和密度。值得注意的是，在临界点附近，即T≈70 MeV和μ≈346 MeV时，自耦常数比真空值提高了七倍以上，这一特征目前尚无文献报道。这种在相界处的强放大表明，轴子介导的相互作用可能在塑造致密星结构和稳定性中起重要作用，对它们的演化和可观测天体物理特征具有潜在影响。

英文摘要：

In compact stellar environments, the stability of dense QCD matter requires the simultaneous fulfillment of charge neutrality and beta equilibrium. In this work, we study how temperature and finite chemical potential affect QCD topology and axion properties within this medium, analyzing both cases with and without the charge neutrality condition. Our results show that the topological susceptibility and axion properties are highly sensitive to the critical behavior of the chiral phase transition in both cases. In particular, the axion mass is strongly suppressed near the transition, while the axion self-coupling constant develops a pronounced peak whose magnitude depends on the temperature and density of the medium. Remarkably, around the critical point at $T\simeq70$ MeV and $μ\simeq346$ MeV, the self-coupling constant is enhanced by more than a factor of seven compared to its vacuum value, a feature that to the best of our knowledge has not been reported in previous studies. Such a strong amplification at the phase boundary indicates that axion-mediated interactions could play an important role in shaping the structure and stability of compact stars, with potential implications for their evolution and observable astrophysical signatures.

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