Can stellar mass black holes be quark stars

@article{Kovcs2009CanSM,
  title={Can stellar mass black holes be quark stars},
  author={Zolt{\'a}n Kov{\'a}cs and K. S. Cheng and Tiberiu Harko},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2009},
  volume={400},
  pages={1632-1642}
}
We investigate the possibility that stellar mass black holes, with masses in the range of 3.8– 6M � , respectively, could be in fact quark stars in the colour–flavour-locked (CFL) phase. Depending on the value of the gap parameter, rapidly rotating CFL quark stars can achieve much higher masses than standard neutron stars, thus making them possible stellar mass black hole candidates. Moreover, quark stars have a very low luminosity and a completely absorbing surface – the infalling matter on… 

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