Superconducting Phases in Neutron Star Cores
Superconducting Phases in Neutron Star Cores
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DOI：
10.3390/universe8040228
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发表时间：
2022-04
期刊：
影响因子：
2.9
通讯作者：
T. Wood;V. Graber
中科院分区：
文献类型：
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作者：
T. Wood;V. Graber
利用包含夹带效应的唯象Ginzburg-Landau模型，我们确定了中子星核心中中子和质子凝聚体的可能基态，它们是磁场强度的函数。结合解析和数值方法，我们发现外核的大部分很可能是“1.5型”超导体(而不是通常认为的II型超导体)，其中的磁通是不均匀分布的，磁通管束由无磁通的Meissner区隔开。我们给出了一个近似判据来确定这个1.5类相和内核中的I类区域之间的转变。我们还表明，磁通管束可以与非超导区域共存，但只能在参数空间的一小部分中共存。
Using a phenomenological Ginzburg–Landau model that includes entrainment, we identify the possible ground states for the neutron and proton condensates in the core of a neutron star, as a function of magnetic field strength. Combining analytical and numerical techniques, we find that much of the outer core is likely to be a “type-1.5” superconductor (instead of a type-II superconductor as often assumed), in which magnetic flux is distributed inhomogeneously, with bundles of magnetic fluxtubes separated by flux-free Meissner regions. We provide an approximate criterion to determine the transition between this type-1.5 phase and the type-I region in the inner core. We also show that bundles of fluxtubes can coexist with non-superconducting regions, but only in a small part of the parameter space.