Vortex vs spinning string: Iordanskii force and gravitational   Aharonov-Bohm effect
  We discuss the transverse force acting on the spinning cosmic string, moving in the background matter. It comes from the gravitational Aharonov-Bohm effect and corresponds to the Iordanskii force acting on the vortex in superfluids, when the vortex moves with respect to the normal component of the liquid. 
G.E. Volovik