Systematic study on the quark-hadron mixed phase in compact stars

Abstract

We investigate systematically the quark-hadron mixed phase in dense stellar matter, and its influence on compact star structures. The properties of quark matter and hadronic matter are fixed based on various model predictions. Beside adopting constant values, the surface tension $\Sigma$ for the quark-hadron interface is estimated with the multiple reflection expansion method and equivparticle model. To fix the structures of quark-hadron pasta phases, a continuous dimensionality of the structure is adopted as proposed by Ravenhall, Pethick, and Wilson. The corresponding properties of hybrid stars are then obtained and confronted with pulsar observations. It is found that the correlation between radius and tidal deformability in traditional neutron stars preserves in hybrid stars. For those permitted by pulsar observations, in almost all cases the quark phase persists inside the most massive compact stars. The quark-hadron interface plays an important role on hybrid star structures once quark matter emerges. The surface tension $\Sigma$ estimated with various methods increases with density, which predicts stiffer EOSs for the quark-hadron mixed phase and increases the maximum mass of hybrid stars. The EOSs of hybrid star matter are well constrained at densities $n\lesssim 0.8$ fm${}^{-3}$, while larger uncertainty is expected at higher densities.

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Cited by in corpus (17)

• Unified neutron star EOSs and neutron star structures in RMF models
• Vector interactions inhibit quark-hadron mixed phases in neutron stars
• Hybrid stars are compatible with recent astrophysical observations
• A Bayesian analysis of the properties of hybrid stars with the NJL model
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• Magnetar QPOs and neutron star crust elasticity
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• Numerical Study of Stellar Core Collapse and Neutrino Emission Using the Nuclear Equation of State Obtained by the Variational Method
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• Quarkyonic matter and quarkyonic stars in an extended RMF model
• Maximum mass of hybrid star formed via shock induced phase transition in cold neutron stars
• Effects of inner crusts on $g$-mode oscillations in neutron stars
• Effects of phase transition in hybrid stars from quark-meson coupling hadronic matter to deconfined quark matter
• Properties and microscopic structures of dense stellar matter in RMF models
• Magnetized strangelets with anomalous magnetic moment and Coulomb interactions