具有分层和II型超导性的磁中子星平衡
Magnetic neutron star equilibria with stratification and type-II superconductivity
摘要：
利用自洽的非线性数值方法，我们构造了具有磁场的中子星的双流体平衡组态。双流体的方法-可能是有效的，但最年轻的NS的大区域-为我们提供了一个简单的方法来引入分层，并允许更现实的模型比无处不在的正压假设。在我们所有的模型中，中子都被模拟为超流体，而对于质子，我们考虑两种情况：一种是它们是正常流体，另一种是它们形成II型超导体。我们考虑各种场配置的正常质子的情况下，在超导的情况下，纯环形场。我们发现，分层允许一个更强的混合场配置的环向分量，虽然极向分量仍然是最大的，在我们所有的模型。我们提供了定量的结果，无论是在正常和超导质子的情况下，磁椭圆的NS。
英文摘要：
We construct two-fluid equilibrium configurations for neutron stars with magnetic fields, using a self-consistent and nonlinear numerical approach. The two-fluid approach - likely to be valid for large regions of all but the youngest NSs - provides us with a straightforward way to introduce stratification and allows for more realistic models than the ubiquitous barotropic assumption. In all our models the neutrons are modelled as a superfluid, whilst for the protons we consider two cases: one where they are a normal fluid and another where they form a type-II superconductor. We consider a variety of field configurations in the normal-proton case and purely toroidal fields in the superconducting case. We find that stratification allows for a stronger toroidal component in mixed-field configurations, though the poloidal component remains the largest in all our models. We provide quantitative results for magnetic ellipticities of NSs, both in the normal- and superconducting-proton cases.
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