作为准周期脉冲星自旋变化源的Tkachenko模
Tkachenko modes as sources of quasiperiodic pulsar spin variations
摘要：
考虑超流与正常流体的相互摩擦和正常流体的剪切粘性，研究了中子星内部单量子化涡旋三角晶格的长波剪切模（Tkachenko波）.如果超流和正常流体之间的耦合很小，则在垂直于自旋矢量的平面中传播的Tkachenko模式的集合是弱阻尼的。在强耦合下，它们的振荡频率较低，并且对于小和中等剪切粘度是无阻尼的。这些模式的周期与观测到的PSR 1828-11自旋的100-1000天变化一致。
英文摘要：
We study the long wavelength shear modes (Tkachenko waves) of triangular lattices of singly quantized vortices in neutron star interiors taking into account the mutual friction between the superfluid and the normal fluid and the shear viscosity of the normal fluid. The set of Tkachenko modes that propagate in the plane orthogonal to the spin vector are weakly damped if the coupling between the superfluid and normal fluid is small. In strong coupling, their oscillation frequencies are lower and are undamped for small and moderate shear viscosities. The periods of these modes are consistent with the observed ~100-1000 day variations in spin of PSR 1828-11.
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