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Abstract

Can stellar mass black holes be quark stars?

We investigate the possibility that stellar mass black holes could be in fact quark stars in the Color-Flavor-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 black hole candidates. Moreover, quark stars have a very low luminosity and a completely absorbing surface. A possibility of distinguishing CFL quark stars from stellar mass black holes is through the study of thin accretion disks around rapidly rotating quark stars and Kerr type black holes, respectively. The physical properties of the disks are different for these two classes of compact objects, thus giving clear observational signatures which may allow to distinguish CFL stars from black holes.

Can stellar mass black holes be quark stars?

We investigate the possibility that stellar mass black holes could e in fact quark stars in the Color-Flavor-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 black hole candidates. Moreover, quark stars have a very low luminosity and a completely absorbing surface. A possibility of distinguishing CFL quark stars from stellar mass black holes is through the study of thin accretion disks around rapidly rotating quark stars and Kerr type black holes, respectively. The physical properties of the disks are different for these two classes of compact objects, thus giving clear observational signatures which may allow to distinguish CFL stars from black holes.

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