{
  "id": "2011.03239",
  "version": "v1",
  "published": "2020-11-06T09:05:10.000Z",
  "updated": "2020-11-06T09:05:10.000Z",
  "title": "Evolution of magnetic deformation in neutron star crust",
  "authors": [
    "Yasufumi Kojima",
    "Shota Kisaka",
    "Kotaro Fujisawa"
  ],
  "comment": "12 pages, 7 figures",
  "categories": [
    "astro-ph.HE",
    "gr-qc"
  ],
  "abstract": "In this study, we examine the magnetic field evolution occurring in a neutron star crust. Beyond the elastic limit, the lattice ions are assumed to act as a plastic flow. The Ohmic dissipation, Hall drift, and bulk fluid velocity driven by the Lorentz force are considered in our numerical simulation. A magnetically induced quadrupole deformation is observed in the crust during the evolution. Generally, the ellipticity decreases as the magnetic energy decreases. In a toroidal-field-dominated model, the sign of the ellipticity changes. Namely, the initial prolate shape tends to become oblate. This occurs because the toroidal component decays rapidly on a smaller timescale than the poloidal dipole component. We find that the magnetic dipole component does not change significantly on the Hall timescale of $\\sim 1$Myr for the considered simple initial models. Thus, a more complex initial model is required to study the fast decay of surface dipoles on the abovementioned timescale.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-11-06T09:05:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "neutron star crust",
      "magnetic deformation",
      "bulk fluid velocity driven",
      "initial prolate shape tends",
      "magnetic field evolution"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}