Dynamical onset of superconductivity and retention of magnetic fields in cooling neutron stars

Wynn C. G. Ho; Nils Andersson; Vanessa Graber

doi:10.1103/PhysRevC.96.065801

Dynamical onset of superconductivity and retention of magnetic fields in cooling neutron stars

Wynn C. G. Ho, Nils Andersson, Vanessa Graber

Department of Physics

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Abstract

A superconductor of paired protons is thought to form in the core of neutron stars soon after their birth. Minimum energy conditions suggest magnetic flux is expelled from the superconducting region due to the Meissner effect, such that the neutron star core is largely devoid of magnetic fields for some nuclear equation of state and proton pairing models. We show via neutron star cooling simulations that the superconducting region expands faster than flux is expected to be expelled because cooling timescales are much shorter than timescales of magnetic field diffusion. Thus magnetic fields remain in the bulk of the neutron star core for at least 10^6-10^7 yr. We estimate the size of flux free regions at 10^7 yr to be

Original language	English
Journal	Phys.Rev.C
DOIs	https://doi.org/10.1103/PhysRevC.96.065801
Publication status	Published - 22 Nov 2017

Keywords

astro-ph.HE
cond-mat.supr-con
hep-ph
nucl-th

Access to Document

10.1103/PhysRevC.96.065801

1711.08480v1

Cite this

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title = "Dynamical onset of superconductivity and retention of magnetic fields in cooling neutron stars",

abstract = " A superconductor of paired protons is thought to form in the core of neutron stars soon after their birth. Minimum energy conditions suggest magnetic flux is expelled from the superconducting region due to the Meissner effect, such that the neutron star core is largely devoid of magnetic fields for some nuclear equation of state and proton pairing models. We show via neutron star cooling simulations that the superconducting region expands faster than flux is expected to be expelled because cooling timescales are much shorter than timescales of magnetic field diffusion. Thus magnetic fields remain in the bulk of the neutron star core for at least 10^6-10^7 yr. We estimate the size of flux free regions at 10^7 yr to be ",

keywords = "astro-ph.HE, cond-mat.supr-con, hep-ph, nucl-th",

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AU - Ho, Wynn C. G.

AU - Andersson, Nils

AU - Graber, Vanessa

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PY - 2017/11/22

Y1 - 2017/11/22

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