AMBIPOLAR DIFFUSION AND ANISOTROPY OF RESISTIVITY IN NEUTRON-STAR CORES

Evolution of the magnetic field in neutron star cores depends on the p roperties of matter above nuclear density. The present paper considers drift and dissipative processes which determine evolution of the magn etic field in the core region. The generalized Ohm's law is derived as suming that all species of particles are in the normal (non-superfluid ) state. We discuss in detail a possible influence of the considered p rocesses on the field decay. Probably the most important of these proc esses is dissipation due to the enhancement of the resistivity in stro ng magnetic fields. Drift phenomena associated with the partial pressu re gradients, however, can also strongly influence evolution of the fi eld. These phenomena are of particular importance if there is no chemi cal equilibrium in npe-plasma.