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Domain walls in neutron P-3(2) superfluids in neutron stars

机译:中子P-3(2)中子恒星的畴壁

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摘要

We work out domain walls in neutron P-3(2) superfluids realized in the core of neutron stars. Adopting the Ginzburg-Landau (GL) theory as a bosonic low-energy effective theory, we consider configurations of domain walls interpolating ground states, i.e., the uniaxial nematic (UN), D-2-biaxial nematic (D-2-BN), and D-4-biaxial nematic (D-4-BN) phases in the presence of zero, small and large magnetic fields, respectively. We solve the Euler-Lagrange equation from the GL free energy density, and calculate surface energy densities of the domain walls. We find that one extra Nambu-Goldstone mode is localized in the vicinity of a domain wall in the UN phase while a U(1) symmetry restores in the vicinity of one type of domain wall in the D-2-BN phase and all domain walls in the D-4-BN phase. Considering a pile of domain walls in the neutron stars, we find that the most stable configurations are domain walls perpendicular to the magnetic fields piled up in the direction along the magnetic fields in the D-2-BN and D-4-BN phases. We estimate the energy released from the deconstruction of the domain walls in the edge of a neutron star, and show that it can reach an astrophysical scale such as glitches in neutron stars.
机译:我们在中子恒星核心中实现的中子P-3(2)Superfluid的域墙。采用林茨堡 - Landau(GL)理论作为博源低能量的理论,我们考虑域壁的配置内插地面态,即单轴向内(联合国),D-2-双轴向内(D-2-BN)和D-4-双轴向列(D-4-BN)分别存在于零,小而大的磁场的相位。我们从GL自由能量密度解决欧拉拉格朗朗方程,并计算畴壁的表面能量密度。我们发现一个额外的Nambu-Goldstone模式在UN相的域壁附近,而U(1)对称在D-2-BN相位和所有域中的一种类型域壁附近恢复D-4-BN相的墙壁。考虑到中子恒星中的一堆畴壁,我们发现最稳定的配置是垂直于沿D-2-BN和D-4-BN相位沿磁场堆叠的磁场垂直的畴壁。我们估计从中子星边缘的畴壁的解构中释放的能量,并表明它可以达到诸如中子恒星中的毛刺等天体物理尺度。

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