Electrical conductivity of neutron star cores in the presence of a magnetic field |
| |
| Authors: | D G Yakovlev D A Shalybkov |
| |
| Institution: | (1) A. F. Ioffe Institute of Physics and Technology, Leningrad, U.S.S.R. |
| |
| Abstract: | 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   0, where 0 = 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 >
c
, where
c
 40. The electric resistivities along and acrossB,   and  , and the Hall resistivity
H
are calculated and fitted by simple analytical formulae at 
c
and >
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; is independent ofB and almost independent of the neutron superfluidity. Charge transport acrossB at largeB may be essentially determined by other charged particles. If
c
, one has = 1 + (B/B
0)2] for the normal neutrons, and for the superfluid neutrons, while
H
=
B/B
e
for both cases. HereB
e
 109
T
8
2
G,B
01011
T
8
2
G, andT
8 is temperature in units of 108 K. Accordingly for the normal neutrons atB B
0, the transverse resistivity suffers an enhancement, 1/4  1. When 50 andB varies from 0 toBB
p
 1013
T
8
2
G, increases by a factor of about 103–104 and
H
changes sign. WhenBB
p
, remains constant for the superfluid neutrons, and
H
B
2 for the normal neutrons, while
H
B for any neutron state. Strong dependence of resistivity onB, T, and may affect evolution of magnetic fields in neutron star cores. In particular, the enhancement of at highB may noticeably speed up the Ohmic decay of those electric currents which are perpendicular toB. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
