Composition and stability of hybrid stars with hyperons and quark color-superconductivity

By L. Bonanno, Armen Sedrakian. 2011

211 citations recorded by the source corpus.

The recent measurement of a $1.97\pm 0.04$ 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 $M \ge 1.97 M_{\sun}$ 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.

Subfields: Astronomy and Astrophysics, Geophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/da6cde3e73c387b07081e9c6abb07b01070c04c6

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Citations in the corpus

Maximum mass of neutron stars and strange neutron-star cores (2012, background): “…of the discovery of a 2 M pulsar, several models of quark cores of NS (hybrid stars), with the necessary properties to yield Mmax > 2.0 M , have been proposed (Özel et al. 2010; Weissenborn et al. 2011; Klaehn et al. 2012; Bonanno & Sedrakian 2012; Łastowiecki et al. 2012; Lenzi & Lugones 2012).”
Stellar structure models in modified theories of gravity: Lessons and challenges (2019, background): “These hybrid stars with a quark core and an hadronic outer layer can get to the 2M⊙ threshold provided that the model parameters are properly chosen [205].”