Phase structure of neutron P23 superfluids in strong magnetic fields in neutron stars
Phase structure of neutron P23 superfluids in strong magnetic fields in neutron stars
复制标题
中子星强磁场中中子P23超流体的相结构
DOI：
10.1103/physrevc.99.035213
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发表时间：
2019
影响因子：
3.1
通讯作者：
Nitta Muneto
中科院分区：
文献类型：
--
作者：
Yasui Shigehiro;Chatterjee Chandrasekhar;Nitta Muneto
我们讨论强磁场对中子超流性的影响。基于两个中子对之间的吸引力，我们采用玻色化技术推导了路径积分形式的Ginzburg-Landau方程，并留下了磁场膨胀的次前级。我们确定了随温度变化的相图，包括三个相：分别是有限和强磁星中的单轴向列（UN）相，双轴向列（BN）和-BN相，其中是二面体群。我们发现，与之前已知的磁场中的前导阶相比，平面中-BN相的区域在磁场的次前导阶项的作用下得到了扩展。我们还介绍了热容量和自旋磁化率等热力学性质，并发现 UN、-BN 和-BN 相的自旋磁化率表现出各向异性。这些信息将有助于了解磁星的内部结构。
We discuss the effect of a strong magnetic field on neutronsuperfluidity. Based on the attraction in thepair of two neutrons, we derive the Ginzburg–Landau equation in the path-integral formalism by adopting the bosonization technique and leave the next-to-leading order in the expansion of the magnetic field. We determine thephase diagram with temperature, comprising three phases: the uniaxial nematic (UN) phase for-biaxial nematic (BN) and-BN phases in finiteand strongsuch as magnetars, respectively, whereandare dihedral groups. We find that, compared with the leading order in the magnetic field known before, the region of the-BN phase in theplane is extended by the effect of the next-to-leading-order terms of the magnetic field. We also present the thermodynamic properties, such as heat capacities and spin susceptibility, and find that the spin susceptibility exhibits anisotropies in the UN,-BN, and-BN phases. This information will be useful to understand the internal structure of magnetars.