Critical end point and universality class of neutron P2 3 superfluids in neutron stars

Takeshi Mizushima, Shigehiro Yasui, Muneto Nitta

研究成果: Article査読

9 被引用数 (Scopus)

抄録

We study the thermodynamics and critical behavior of neutron P23 superfluids in the inner cores of neutron stars. P23 superfluids offer a rich phase diagram including uniaxial/biaxial nematic phases, the ferromagnetic phase, and the cyclic phase. Using the Bogoliubov-de Gennes equation as in superfluid Fermi liquid theory, we show that a strong (weak) magnetic field drives the first-order (second-order) transition from the dihedral-two biaxial nematic phase to the dihedral-four biaxial nematic phase at low (high) temperatures and their phase boundaries are divided by the critical end point (CEP). We demonstrate that the set of critical exponents at the CEP satisfies the Rushbrooke, Griffiths, and Widom equalities, indicating a different universality class. At the CEP, the P23 superfluid exhibits critical behavior with nontrivial critical exponents, indicating an alternative universality class. Furthermore, we find that the Ginzburg-Landau (GL) equation up to the eighth-order expansion satisfies three equalities and properly captures the physics of the CEP. This implies that the GL theory can provide a tractable way for understanding critical phenomena which may be realized in the dense core of realistic magnetars.

本文言語English
論文番号013194
ジャーナルPhysical Review Research
2
1
DOI
出版ステータスPublished - 2020 2月

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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