Astrophysics and Space Science

, Volume 176, Issue 2, pp 191–215 | Cite as

Electrical conductivity of neutron star cores in the presence of a magnetic field

II. A free-particle model of npe∑-matter
  • D. G. Yakovlev
  • D. A. Shalybkov


General theory of electrical conductivity of a multicomponent mixture of degenerate fermions in a magnetic fieldB, developed in the preceding article (this volume), is applied to a matter in neutron star interiors at densities ρ≳ρ0, where ρ0 = 2.8×1014 g cm−3 is the standard nuclear matter density. A model of free-particle mixture ofn, p, e is used, with account for appearance of ∑-hyperons at ρ>ρ c , where ρ c ≈4ρ0. The electric resistivities along and acrossB, ℛ and ℛ, and the Hall resistivity ℛ H are calculated and fitted by simple analytical formulae at ρ≤ρ c and ρ>ρ c for the cases of normal or superfluid neutrons provided other particles are normal. Charge transport alongB is produced by electrons, due to their Coulombic collisions with other charged particles; ℛ is independent ofB and almost independent of the neutron superfluidity. Charge transport acrossB at largeB may be essentially determined by other charged particles. If ρ≤ρ c , one has ℛ = ℛ[1 + (B/B0)2] for the normal neutrons, and ℛ for the superfluid neutrons, while ℛ H = ℛB/B e for both cases. HereB e ∼109T 8 2 G,B0∼1011T 8 2 G, andT8 is temperature in units of 108 K. Accordingly for the normal neutrons atBB0, the transverse resistivity ℛ suffers an enhancement, ℛ1/4 ≪ ℛ1. When ρ≳5ρ0 andB varies from 0 toBB p ∞ 1013T 8 2 G, ℛ increases by a factor of about 103–104 and ℛ H changes sign. WhenBB p , ℛ remains constant for the superfluid neutrons, and ℛ H B2 for the normal neutrons, while ℛ H B for any neutron state. Strong dependence of resistivity onB, T, and ρ may affect evolution of magnetic fields in neutron star cores. In particular, the enhancement of ℛ at highB may noticeably speed up the Ohmic decay of those electric currents which are perpendicular toB.


Electrical Conductivity Charged Particle Neutron Star Nuclear Matter Charge Transport 
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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • D. G. Yakovlev
    • 1
  • D. A. Shalybkov
    • 1
  1. 1.A. F. Ioffe Institute of Physics and TechnologyLeningradU.S.S.R.

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