Volume 539, March 2012
|Number of page(s)||5|
|Section||Stellar structure and evolution|
|Published online||20 February 2012|
Composition and stability of hybrid stars with hyperons and quark color-superconductivity
Institute for Theoretical Physics, J.-W. Goethe University,
Accepted: 26 October 2011
The recent measurement of a 1.97 ± 0.04 solar-mass pulsar places a stringent lower bound on the maximum mass of compact stars and therefore challenges the existence of any agents that soften the equation of state of ultra-dense matter. We investigate whether hyperons and/or quark matter can be accommodated in massive compact stars by constructing an equation of state based on a combination of phenomenological relativistic hyper-nuclear density functional and an effective model of quantum chromodynamics (the Nambu-Jona-Lasinio model). Stable configurations are obtained with M ≥ 1.97 M⊙ featuring hyper-nuclear and quark matter in color superconducting state if the equation of state of nuclear matter is stiff above the saturation density, the transition to quark matter takes place at a few times the nuclear saturation density, and the repulsive vector interactions in quark matter are substantial.
Key words: stars: neutron
© ESO, 2012
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