Rapid cooling of neutron star in Cassiopeia A and r-mode damping in the   core
  We proposed alternative explanation to the rapid cooling of neutron star in Cas A. It is suggested that the star is experiencing the recovery period following the r-mode heating process,assuming the star is differentially rotating. Like the neutron-superfluidity-triggering model, our model predicts the rapid cooling will continue for several decades. However, the behavior of the two models has slight differences, and they might be distinguished by observations in the near future. 
Shu-Hua Yang, Chun-Mei Pi, Xiao-Ping Zheng
astro-ph.HE