The conversion of Neutron star to Strange star : A two step process
  The conversion of neutron matter to strange matter in a neutron star have been studied as a two step process. In the first step, the nuclear matter gets converted to two flavour quark matter. The conversion of two flavour to three flavour strange matter takes place in the second step. The first process is analysed with the help of equations of state and hydrodynamical equations, whereas, in the second process, non-leptonic weak interaction plays the main role. Velocities and the time of travel through the star of these two conversion fronts have been analysed and compared. 
Abhijit Bhattacharyya, Sanjay K. Ghosh, Partha S. Joardar, Ritam   Mallick and Sibaji Raha