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Магнiтнi сприйнятливостi густої надплинної нейтронної матерiї з узагальненими силами скiрма та спiн-триплетною взаємодiєю при нульовiй температурi

Магнiтнi сприйнятливостi густої надплинної нейтронної матерiї з узагальненими силами скiрма та спiн-триплетною взаємодiєю при нульовiй температурi

Magnetic properties of a dense superfluid neutron matter (relevant to the physics of neutron star cores) at subnuclear and supranuclear densities (in the range 0.5&nbsp;&lt;&nbsp;n=n0&nbsp;&lt;&nbsp;3.0, where n0 = 0.17 (fm^-3) is the saturation nuclear density) with the so-c...

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Bibliographic Details
Main Author: Tarasov, A. N.
Format: Article
Language:English
Published: Publishing house "Academperiodika" 2018
Subjects:
dense superfluid neutron matter
Skyrme forces
spin-triplet pairing
Online Access:https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018331
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Summary:Magnetic properties of a dense superfluid neutron matter (relevant to the physics of neutron star cores) at subnuclear and supranuclear densities (in the range 0.5&nbsp;&lt;&nbsp;n=n0&nbsp;&lt;&nbsp;3.0, where n0 = 0.17 (fm^-3) is the saturation nuclear density) with the so-called generalized Skyrme effective forces BSk18, BSk19, BSk20, BSk21 (containing additional unconventional density-dependent terms) and with spin-triplet p-wave pairing (with spin S = 1 and orbital moment L = 1) in the presence of a strong magnetic field are studied within the framework of the non-relativistic generalized Fermi-liquid theory at zero temperature. The upper limit for the density range of a neutron matter is restricted by the magnitude 3n0 in order to avoid the account of relativistic corrections growing with density. The general formula obtained in [1] (valid for any parametrization of the Skyrme forces) for the magnetic susceptibility of a superfluid neutron matter at zero temperature is specified here for the new BSk18-BSk21 parametrizations of the Skyrme interaction. As is known, all previous conventional Skyrme interactions predict spin instabilities in a normal (nonsuperfluid) neutron matter beyond the saturation nuclear density. It is obtained in the present work that, for the model of superfluid neutron matter with new generalized BSk18-BSk21 parametrizations, such phase transition to the ferromagnetic state occurs neither at subnuclear nor at supranuclear densities. Thus, the high-density ferromagnetic instability is removed in the neutron matter with new generalized Skyrme forces BSk18-BSk21 not only in normal, but also in superfluid states with anisotropic spin-triplet pairing.

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