Hybrid Stars in an SU(3) Parity Doublet Model

Abstract

We apply an extended version of the SU(3) parity model, containing quark degrees of freedom, to study neutron stars. The model successfully reproduces the main thermodynamic features of QCD which allows us to describe the composition of dense matter. Chiral symmetry restoration is realized inside the star and the chiral partners of the baryons appear, their masses becoming degenerate. Furthermore, quark degrees of freedom appear in a transition to a deconfined state. Performing an investigation of the macroscopic properties of neutron stars, we show that observational constraints, like mass and thermal evolution, are satisfied and new predictions can be made.

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• Extreme Matter meets Extreme Gravity: Ultra-heavy neutron stars with crossovers and first-order phase transitions
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• The possibility of twin star solutions in a model based on lattice QCD thermodynamics
• Modelling Hybrid Stars in Quark-Hadron Approaches
• Chiral condensates for neutron stars in hadron-quark crossover: from a parity doublet nucleon model to an NJL quark model
• Parity doubling of baryons in a chiral approach with three flavors
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• Speed of sound and quark confinement inside neutron stars
• Hypernuclei and the hyperon problem in neutron stars
• Neutron star matter based on a parity doublet model including the $a_0(980)$ meson
• Neutron star properties with careful parameterization in the (axial)vector meson extended linear sigma model
• Repulsive properties of hadrons in lattice QCD data and neutron stars
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• Fluctuations near the liquid-gas and chiral phase transitions in hadronic matter
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• Hybrid stars with large quark cores within the parity doublet model and modified NJL model
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• Interplay between chiral dynamics and repulsive interactions
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• Rotational Properties of Inverted Hybrid Stars
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• Chiral condensates for neutron stars in hadron-quark crossover; from a parity doublet nucleon model to an NJL quark model
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• From Cosmic Matter to the Laboratory
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• Parity-doubled nucleons can rapidly cool neutron stars