论文标题
中子恒星外壳中磁化变形的演变
Evolution of magnetic deformation in neutron star crust
论文作者
论文摘要
在这项研究中，我们检查了中子恒星外壳中发生的磁场进化。超出弹性极限，假定晶格离子充当塑料流。在我们的数值模拟中，考虑了由洛伦兹力驱动的欧姆耗散，霍尔漂移和散装流体速度。在进化过程中，在地壳中观察到磁引起的四极变形。通常，椭圆度随着磁能的降低而降低。在圆环场主导的模型中，椭圆度的符号发生了变化。也就是说，初始的岩体形状倾向于植入。之所以发生这种情况，是因为在比poloidal偶极子分量的时间尺度上，环形组件在较小的时间表上迅速衰减。我们发现，对于经过的简单初始型号，磁性偶极子组件在$ \ sim 1 $ myr的霍尔时间尺度上没有显着变化。因此，需要更复杂的初始模型来研究上述时间尺度上表面偶极子的快速衰减。
In this study, we examine the magnetic field evolution occurring in a neutron star crust. Beyond the elastic limit, the lattice ions are assumed to act as a plastic flow. The Ohmic dissipation, Hall drift, and bulk fluid velocity driven by the Lorentz force are considered in our numerical simulation. A magnetically induced quadrupole deformation is observed in the crust during the evolution. Generally, the ellipticity decreases as the magnetic energy decreases. In a toroidal-field-dominated model, the sign of the ellipticity changes. Namely, the initial prolate shape tends to become oblate. This occurs because the toroidal component decays rapidly on a smaller timescale than the poloidal dipole component. We find that the magnetic dipole component does not change significantly on the Hall timescale of $\sim 1$Myr for the considered simple initial models. Thus, a more complex initial model is required to study the fast decay of surface dipoles on the abovementioned timescale.
