Testing the Accretion-induced Field-decay and Spin-up Model for Recycled   Pulsars
  Millisecond radio pulsars have long been proposed to form from a spin-up recycling process in a binary system. In this paper we demonstrate that the accretion-induced field-decay and spin-up model for recycled pulsars can indeed produce those millisecond pulsars with relatively weak magnetic fields of $10^8-10^9$ G and short spin periods of a few milliseconds. Our results also suggest that the value of the currently observed highest spin frequency of millisecond pulsars may simply be constrained by the amount of mass available for accretion. 
Jing Wang, Cheng-min Zhang, H.-K. Chang
astro-ph.HE