中子星核心致密npΛ物质的热导率
Thermal conductivity of dense $npΛ$ matter in neutron star cores
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中文总结 AI 辅助
研究大质量中子星核心中npΛ物质热导率，采用变分线性化玻尔兹曼动力学方法及DDME2状态方程，发现中子主导热输运，Λ超子使中子电导率小幅降低，核心热弛豫时间尺度基本不变。
中文摘要 AI 辅助
大质量中子星核心中可能存在的超子对其微观输运性质和热演化具有重要意义。尽管近期在核心输运建模方面取得了进展，但现有文献中仍缺乏对特定npΛ混合物热导率的专门分析。在这项工作中，我们在变分线性化玻尔兹曼动力学方法框架内，研究了致密、β平衡的npΛ物质的热导率，采用了依赖密度的DDME2状态方程，重子密度范围为(0.5--4.5)n₀。我们发现中子仍然主导热输运，与纯核子物质相比，Λ超子的出现仅使中子电导率有显著的小幅降低。这些结果表明，在存在Λ超子的情况下，核心热弛豫时间尺度实际上保持不变。
英文摘要
The possible presence of hyperons in the cores of massive neutron stars has important implications for their microscopic transport properties and thermal evolution. Despite recent progress in modelling core transport, a dedicated analysis regarding the thermal conductivity of a specific \(npΛ\) mixture remains absent from the existing literature. In this work, we investigate the thermal conductivity of dense, \(β\)-equilibrated \(npΛ\) matter within the framework of the variational linearized Boltzmann kinetic approach, employing the density-dependent DDME2 equation of state across a baryon density range of \((0.5\text{--}4.5)\,n_0\). We find that neutrons still dominate thermal transport, while the onset of \(Λ\) hyperons induces only a remarkably small reduction in neutron conductivity compared to pure nucleonic matter. These results suggests that the core thermal relaxation timescale remains practically unaltered in the presence of $Λ$ hyperons.
