Converting Neutron Stars into Strange Stars: Instanton Model
  We estimate the quasiclassical probability of the homogeneous nuclear matter transition to a strange matter when a detonation wave propagates radially inside a sphere of nuclear matter. For this purpose we make use of instanton method which is known in the quantum field theory. 
Victor Ts. Gurovich and Leonid G. Fel
astro-ph.HE physics.flu-dyn