### 抄録

We discuss the effect of a strong magnetic field on neutron P23 superfluidity. Based on the attraction in the P23 pair 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 B. We determine the (T,B) phase diagram with temperature T, comprising three phases: the uniaxial nematic (UN) phase for B=0, D2-biaxial nematic (BN) and D4-BN phases in finite B and strong B such as magnetars, respectively, where D2 and D4 are dihedral groups. We find that, compared with the leading order in the magnetic field known before, the region of the D2-BN phase in the (T,B) plane 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, D2-BN, and D4-BN phases. This information will be useful to understand the internal structure of magnetars.

元の言語 | English |
---|---|

記事番号 | 035213 |

ジャーナル | Physical Review C |

巻 | 99 |

発行部数 | 3 |

DOI | |

出版物ステータス | Published - 2019 3 27 |

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### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### これを引用

*Physical Review C*,

*99*(3), [035213]. https://doi.org/10.1103/PhysRevC.99.035213

**Phase structure of neutron P2 3 superfluids in strong magnetic fields in neutron stars.** / Yasui, Shigehiro; Chatterjee, Chandrasekhar; Nitta, Muneto.

研究成果: Article

*Physical Review C*, 巻. 99, 番号 3, 035213. https://doi.org/10.1103/PhysRevC.99.035213

}

TY - JOUR

T1 - Phase structure of neutron P2 3 superfluids in strong magnetic fields in neutron stars

AU - Yasui, Shigehiro

AU - Chatterjee, Chandrasekhar

AU - Nitta, Muneto

PY - 2019/3/27

Y1 - 2019/3/27

N2 - We discuss the effect of a strong magnetic field on neutron P23 superfluidity. Based on the attraction in the P23 pair 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 B. We determine the (T,B) phase diagram with temperature T, comprising three phases: the uniaxial nematic (UN) phase for B=0, D2-biaxial nematic (BN) and D4-BN phases in finite B and strong B such as magnetars, respectively, where D2 and D4 are dihedral groups. We find that, compared with the leading order in the magnetic field known before, the region of the D2-BN phase in the (T,B) plane 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, D2-BN, and D4-BN phases. This information will be useful to understand the internal structure of magnetars.

AB - We discuss the effect of a strong magnetic field on neutron P23 superfluidity. Based on the attraction in the P23 pair 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 B. We determine the (T,B) phase diagram with temperature T, comprising three phases: the uniaxial nematic (UN) phase for B=0, D2-biaxial nematic (BN) and D4-BN phases in finite B and strong B such as magnetars, respectively, where D2 and D4 are dihedral groups. We find that, compared with the leading order in the magnetic field known before, the region of the D2-BN phase in the (T,B) plane 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, D2-BN, and D4-BN phases. This information will be useful to understand the internal structure of magnetars.

UR - http://www.scopus.com/inward/record.url?scp=85064077234&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85064077234&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.99.035213

DO - 10.1103/PhysRevC.99.035213

M3 - Article

AN - SCOPUS:85064077234

VL - 99

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 3

M1 - 035213

ER -