标题： 稠密多组分等离子体中的电子-离子散射：吸积中子星外层包层的应用 显示英文标题

标题： Electron-ion scattering in dense multi-component plasmas: application to the outer crust of an accreting neutron star

摘要： 致密{\it 多组分}等离子体的热导率对于吸积中子星的建模至关重要。为此，我们进行了大规模分子动力学模拟，以计算从光球-海洋边界到中子滴点附近的中子星地壳中致密多组分等离子体的静态结构因子。这些结构因子被用来验证一个适用于任意复杂等离子体的微观线性混合规则，该规则在广泛的库仑耦合范围内有效。微观混合规则反过来又表明并验证了状态方程性质的线性混合规则，以及密集多组分等离子体电导率和热导率的线性混合规则。为了使我们的结果尽可能有用，在电导率和热导率的具体情况下，我们提供了一个简单的解析拟合公式，该公式在广泛的库仑耦合范围内适用于任意复杂的多组分等离子体。我们计算了吸积中子星外层地壳代表性成分分布的热导率，其中可能存在数百种核素。我们利用这些结果重新审视了用于表征杂质等离子体的所谓杂质参数形式主义。 显示英文摘要

摘要： The thermal conductivity of a dense {\it multi-component} plasma is critical to the modeling of accreting neutron stars. To this end, we perform large-scale molecular dynamics simulations to calculate the static structure factor of the dense multi-component plasma in the neutron star crust from near the photosphere-ocean boundary to the vicinity of the neutron drip point. The structure factors are used to validate a microscopic linear mixing rule that is valid for arbitrarily complex plasmas over a wide range of Coulomb couplings. The microscopic mixing rule in turn implies and validates the linear mixing rule for the equation of state properties and also the linear mixing rule for the electrical and thermal conductivities of dense multi-component plasmas. To make our result as useful as possible, for the specific cases of electrical and thermal conductivities, we provide a simple analytic fit that is valid for arbitrarily complex multi-component plasmas over a wide range of Coulomb couplings. We compute the thermal conductivity for a representative compositional profile of the outer crust of an accreting neutron star in which hundreds of nuclear species can be present. We utilize our results to re-examine the so-called impurity parameter formalism as used to characterize impure plasmas.