Wikipedia
Quark-nova
A quark-nova is the hypothetical violent explosion resulting from the conversion of a neutron star to a quark star. Analogous to a supernova heralding the birth of a neutron star, a quark nova signals the creation of a quark star. The term quark-novae was first coined and suggested in 2002 by Dr. Rachid Ouyed and Drs. J. Dey and M. Dey (Calcutta University, India).