Modelling Hybrid Stars in Quark-Hadron Approaches

Abstract

The density in the core of neutron stars can reach values of about 5 to 10 times nuclear matter saturation density. It is, therefore, a natural assumption that hadrons may have dissolved into quarks under such conditions, forming a hybrid star. This star will have an outer region of hadronic matter and a core of quark matter or even a mixed state of hadrons and quarks. In order to investigate such phases, we discuss different model approaches that can be used in the study of compact stars as well as being applicable to a wider range of temperatures and densities. One major model ingredient, the role of quark interactions in the stability of massive hybrid stars is discussed. In this context, possible conflicts with lattice QCD simulations are investigated.

Contribution to the EPJA Topical Issue on "Exotic Matter in Neutron Stars"

References in corpus (21)

• The equation of state in (2+1)-flavor QCD
• Equation of state and QCD transition at finite temperature
• Proto-Neutron and Neutron Stars in a Chiral SU(3) Model
• Thermodynamics of the PNJL model
• Asymmetric nuclear matter in a parity doublet model with hidden local symmetry
• (3+1)-Dimensional Hydrodynamic Expansion with a Critical Point from Realistic Initial Conditions
• Stability of CFL cores in Hybrid Stars
• Phase diagram and surface tension in the three-flavor Polyakov-quark-meson model
• Neutron stars with small radii -- the role of delta resonances
• An effective model for the QCD phase transitions at finite baryon density
• Massive hybrid stars with a first order phase transition
• The role of strangeness in hybrid stars and possible observables
• The problem of repulsive quark interactions - Lattice versus mean field models
• Reconciling Nuclear and Astrophysical Constraints
• Neutron stars within the SU(2) parity doublet model
• Hybrid neutron stars with the Dyson-Schwinger quark model and various quark-gluon vertices
• The Van-der-Waals Gas EOS for the Lorentz Contracted Spheres
• Dynamical Generation of a Repulsive Vector Contribution to the Quark Pressure
• Hybrid neutron stars based on a modified PNJL model
• Mean field approach to flavor susceptibilities with a vector interaction
• Equation of state and sound velocity of hadronic gas with hard-core interaction

Cited by in corpus (11)

• Hybrid and quark star matter based on a non-perturbative equation of state
• Constraining strangeness in dense matter with GW170817
• Nonperturbative quark matter equations of state with vector interactions
• Twin stars as probes of the nuclear equation of state: effects of rotation through the PSR J0952-0607 pulsar and constraints via the tidal deformability from the GW170817 event
• Casimir effect for nucleon parity doublets
• A Detailed Analysis of the Special Points on $M-R$ Solutions of Hybrid (Twin) Stars
• Properties of Hybrid Stars with Density Dependent Bag Model
• Effects of hadron-quark phase transition on properties of Neutron Stars
• Variation of delta baryon mass and hybrid star properties in static and rotating conditions
• Deconfinement of non-strange hadronic matter with nucleons and $\Delta$ baryons to quark matter in neutron stars
• Interacting quark matter effects on the structure of compact stars