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We present analytic calculations of the electromagnetic torques acting on amagnetic neutron star rotating in vacuum, including near-zone torquesassociated with the inertia of dipole and quadrupole magnetic fields. Weincorporate these torques into the rotational dynamics of a rigid-body neutronstar, and show that the effects of the inertial torque can be understood as amodification of the moment of inertia tensor of the star. We apply ourrotational dynamics equation to the Crab pulsar, including intrinsicdistortions of the star and various electromagnetic torques, to investigate thepossibility that the counter-alignment of the magnetic inclination angle, assuggested by recent observations, could be explained by pulsar precession. Wefind that if the effective principal axis of the pulsar is nearly aligned witheither the magnetic dipole axis or the rotation axis, then precession mayaccount for the observed counter-alignment over decade timescales. Over thespindown timescale of the pulsar, the magnetic inclination angle alwaysdecreases.

Electromagnetic Torques, Precession and Evolution of Magnetic Inclination of Pulsars