The swallowing of a quark star by a black hole
  In 3-d SPH simulations of the coalescence of a quark star with a pseudo-Newtonian black hole all of the quark matter is quickly accreted by the black hole. The Madsen-Caldwell-Friedman argument against the existence of quark stars may need to be re-examined. 
Wlodzimierz Kluzniak (CAMK & Inst. of Astronomy, Zielona Gora,   Poland), and William H. Lee (Instituto de Astronomia, UNAM)