Stability of interlinked neutron vortex and proton flux tube arrays in a neutron star. II. Far-from-equilibrium dynamics
Stability of interlinked neutron vortex and proton flux tube arrays in a neutron star. II. Far-from-equilibrium dynamics
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中子星中互连的中子涡旋和质子通量管阵列的稳定性。
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. Melatos
中科院分区：
文献类型：
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作者：
L. Drummond;A. Melatos
当磁旋转对称性被破坏时，中子超流体涡流与旋转谐波陷阱中的质子超导体通量管相互作用的平衡配置通常是不平凡的。由于涡流-涡流排斥和涡流-通量管钉扎之间的竞争，磁轴和旋转轴之间的非零角度 $heta$ 会导致缠结涡流。在这里，我们通过在三个维度上数值求解与时间相关的随机 Gross-Pitaevskii 方程来研究当陷阱减速时涡流的远离平衡行为。数值模拟揭示了新的涡流行为。描述了不断演变的涡旋缠结的关键几何属性，以及钉扎阻碍中子凝聚体减速的程度，作为 $eta$、钉扎强度和 $heta$ 的函数。模拟系统是减速中子星外核的部分模拟，尽管参数范围非常不同。
The equilibrium configurations of neutron superfluid vortices interacting with proton superconductor flux tubes in a rotating, harmonic trap are non-trivial in general, when the magnetorotational symmetry is broken. A non-zero angle $ heta$ between the magnetic and rotation axes leads to tangled vorticity due to competition between vortex-vortex repulsion and vortex-flux-tube pinning. Here we investigate the far-from-equilibrium behaviour of the vortices, as the trap decelerates, by solving the time-dependent, stochastic, Gross-Pitaevskii equation numerically in three dimensions. The numerical simulations reveal new vortex behaviours. Key geometrical attributes of the evolving vortex tangle are characterised, as is the degree to which pinning impedes the deceleration of the neutron condensate as a function of $eta$, the pinning strength, and $ heta$. The simulated system is a partial analogue of the outer core of a decelerating neutron star, albeit in a very different parameter regime.