Heavy hybrid stars from multi-quark interactions

Abstract

We explore the possibility of obtaining heavy hybrid stars within the framework of the two flavor Nambu--Jona-Lasinio model with 8-quark interactions in the scalar and in the vector channel. The main impact of the 8-quark scalar channel is to reduce the onset of quark matter, while the 8-quark vector channel acts to stiff the equation of state at high densities. Within the parameter space where the 4-quark vector channel is small, and the 8-quark vector channel sizeable, stable stars with $2M_{\odot }$ and above are found to hold quark matter in their cores.

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• Characteristics of hybrid compact stars with a sharp hadron-quark interface
• Mixed phase effects on high-mass twin stars
• Compact stars in a SU(3) Quark-Meson Model
• Hybrid Stars using the Quark-Meson Coupling and Proper Time NJL Models
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• Neutron stars with large quark cores
• Phenomenological quark-hadron equations of state with first-order phase transitions for astrophysical applications
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• Quark matter in light neutron stars
• Chirally improved quark Pauli blocking in nuclear matter and applications to quark deconfinement in neutron stars
• Neutron star mass limit at $2M_{\odot }$ supports the existence of a CEP
• High-mass twins & resolution of the reconfinement, masquerade and hyperon puzzles of compact star interiors
• Strange quark matter in the presence of explicit symmetry breaking interactions
• Hybrid stars with large strange quark cores constrained by GW170817
• A general framework to diagonalize vector--scalar and axial-vector--pseudoscalar transitions in the effective meson Lagrangian
• Model of the Phase Transition Mimicking the Pasta Phase in Cold and Dense Quark-Hadron Matter
• Towards generating a new supernova equation of state: A systematic analysis of cold hybrid stars
• Quark-quark interaction and quark matter in neutron stars
• Mass-radius constraints for the neutron star EoS - Bayesian analysis
• Towards a new quark-nuclear matter EoS for applications in astrophysics and heavy-ion collisions
• Masses of the lowest spin-0 and spin-1 meson nonets: explicit symmetry breaking effects
• Compact star properties from an extended linear sigma model
• Excluded volume effects in the hybrid star EoS
• Hybrid stars from a constrained equation of state
• How Neutron Star Observations Point Towards Exotic Matter: Existing Explanations and a Prospective Proposal