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首页> 外文期刊>Physical review, C >Outer crust of a cold, nonaccreting neutron star within the quark-meson-coupling model
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Outer crust of a cold, nonaccreting neutron star within the quark-meson-coupling model

机译：Quark-Meson耦合模型内的冷，非侵入中子星的外壳

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摘要

The outer crust properties of cold nonaccreting neutron stars are studied within the framework of the quark-meson coupling (QMC) model, which includes the effects of modifications of the quark structure inside individual nucleons when they are within a high-density nuclear medium. With a unique set of five well-constrained adjustable parameters, which have a clear physical basis, the QMC model gives predictions for the ground state observables of even-even nuclei which agree with experiment as well as traditional models. Furthermore, it gives improved theoretical values for nuclei thought to play a role in the outer crusts of neutron stars but for which experimental data are not available. Using the latest experimental data tables wherever possible but otherwise the predictions from the QMC model, we construct an equation of state for the outer crust, which is then used within stellar model calculations to obtain an equilibrium sequence of crustal layers, each characterized by a particular neutron-rich nucleus. Various properties of the layers are calculated for a range of neutron-star masses and comparisons are made with alternative equations of state from the literature. This leads to the conclusion that the QMC model successfully predicts the outer crust properties and is fully comparable with the more traditional mass models, which all depend on a larger number of parameters.
机译：本文在夸克-介子耦合（QMC）模型的框架内研究了冷不凝聚中子星的外壳性质，该模型考虑了在高密度核介质中单个核子内部夸克结构的改变的影响。QMC模型有一组独特的五个受良好约束的可调参数，这些参数具有明确的物理基础，可以预测偶数核的基态观测值，这与实验和传统模型一致。此外，对于被认为在中子星外壳中起作用但没有实验数据的核，它给出了改进的理论值。尽可能使用最新的实验数据表，但不使用QMC模型的预测，我们构建了一个外地壳状态方程，然后在恒星模型计算中使用该方程，以获得地壳层的平衡序列，每个地壳层都有一个特定的富中子核。计算了中子星质量范围内各层的各种性质，并与文献中的替代状态方程进行了比较。由此得出的结论是，QMC模型成功地预测了地壳外性质，并与更传统的质量模型完全可比，后者都依赖于更多的参数。

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