GRAVITATION SPIN EFFECT ON THE MAGNETIC-INCLINATION EVOLUTION OF PULSARS

If pulsar magnetic fields are associated with the intrinsic magnetic m oment of neutrons inside the stellar crust, the gravitational spin eff ect can induce the magnetic axis to align with the rotation axis. Our theoretical results show that the decay time scale is inversely propor tional to the magnetic field strength, and that longer initial period pulsars can delay the alignment process. Therefore the inclination ang le of strong magnetic field pulsars should be distributed randomly but the weak field pulsars should concentrate towards lower values of inc lination angle. Various statistical analyses comparing theoretical pre dictions and observational data have been done and satisfactory agreem ent between them obtained.