Crust-core interactions and the magnetic dipole orientation in neutron stars

Abstract

We develop an effective model for a neutron star with a magnetosphere. It takes into account the electromagnetic torques acting on the magnetic dipole, the friction forces between the crust and the core, and the gravitational corrections. Anomalous electromagnetic torques, usually neglected in a rigid star model, play here a crucial role for the alignement of the magnetic dipole. The crust-core coupling time implied by the model is consistent with the observational data and other theoretical estimations. This model describes the main features of the behavior of the magnetic dipole during the life of the star, and in particular gives a natural explanation for the n<3 value of the breaking index in a young neutron star.

23 pages, 1 figure

References in corpus (2)

• Neutron star magnetic field evolution, crust movement and glitches
• Are We Seeing Magnetic Axis Reorientation in the Crab and Vela Pulsars?

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• The spin evolution of neutron stars with the superfluid core
• The spin evolution of the pulsars with non-rigid core