Effects of strong magnetic fields on neutron ${}^3{P}_2$ superfluidity with spin-orbit interactions

Abstract

We discuss neutron ${}^3{P}_2$ phases in the core of neutron stars in strong magnetic field (magnetars). The neutron ${}^3{P}_2$ pairing provides a wide variety of condensates, such as the uniaxial nematic and (D${}_2$ and D${}_4$) biaxial nematic, with different symmetries stemming from the combinations of spin and momentum. Based on the spin-orbital angular momentum coupling and the spin-magnetic field coupling of the neutrons, we derive the Ginzburg-Landau equation containing higher order terms of the magnetic field. We investigate the phase diagram of the neutron ${}^3{P}_2$ superfluidity, and find that the D${}_2$ biaxial nematic phase is extended by the higher order terms of the magnetic field. We also discuss the thermodynamic properties, the heat capacity and the spin susceptibility.

Prepared for proceedings of QNP-2018, "The 8th International Conference on Quarks and Nuclear Physics" to be published in JPS Conf. Proc. Based on the original paper arXiv:1810.04901 [nucl-th]

References in corpus (4)

• Superfluidity and Superconductivity in Neutron Stars
• Nuclear pairing from microscopic forces: singlet channels and higher-partial waves
• Colorful boojums at the interface of a color superconductor
• Topology and symmetry of surface Majorana arcs in cyclic superconductors

Cited by in corpus (8)

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• Spin-polarized phases of ${}^3{P}_2$ superfluids in neutron stars
• Core structures of vortices in Ginzburg-Landau theory for neutron ${}^3{P}_2$ superfluids
• Proximity effects of vortices in neutron ${}^3{P}_2$ superfluids in neutron stars: Vortex core transitions and covalent bonding of vortex molecules
• Symmetry classification of uniform states in spin-2 Bose-Einstein condensates and neutron ${}^3{P}_2$ superfluids
• Emergent chirality and superfluidity of parity-doubled baryons in neutron stars