A hybrid neutron star model with an intermediate hypernuclear shell and a stiff color-superconducting quark core can reach 2.2 solar masses and satisfies current mass and radius constraints.
Neutron Star Structure with Hyperons and Quarks
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abstract
We discuss the high-density nuclear equation of state within the Brueckner-Hartree-Fock approach. Particular attention is paid to the effects of nucleonic three-body forces, the presence of hyperons, and the joining with an eventual quark matter phase. The resulting properties of neutron stars, in particular the mass-radius relation, are determined. It turns out that stars heavier than 1.3 solar masses contain necessarily quark matter.
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First-order phase transition from hypernuclear matter to deconfined quark matter obeying new constraints from compact star observations
A hybrid neutron star model with an intermediate hypernuclear shell and a stiff color-superconducting quark core can reach 2.2 solar masses and satisfies current mass and radius constraints.