Pulsar Kicks from Majoron Emission
  We show that Majoron emission from a hot nascent neutron star can be anisotropic in the presence of a strong magnetic field. If Majorons carry a non-negligible fraction of the supernova energy, the resulting recoil velocity of a neutron star can explain the observed velocities of pulsars. 
Y. Farzan, G. Gelmini and A. Kusenko