Repulsive Vector Interaction in Three Flavor Magnetized Quark and Stellar Matter

Abstract

The effect of the vector interaction on three flavor magnetized matter is studied within the SU(3) Nambu--Jona-Lasiono quark model. We have considered cold matter under a static external magnetic field within two different models for the vector interaction in order to investigate how the form of the vector interaction and the intensity of the magnetic field affect the equation of state as well as the strangeness content. It was shown that the flavor independent vector interaction predicts a smaller strangeness content and, therefore, harder equations of state. On the other hand, the flavor dependent vector interaction favors larger strangeness content the larger the vector coupling. We have confirmed that at low densities the magnetic field and the vector interaction have opposite competing effects: the first one softens the equation of state while the second hardens it. Quark stars and hybrid stars subject to an external magnetic field were also studied. Larger star masses are obtained for the flavor independent vector interaction. Hybrid stars may bare a core containing deconfined quarks if neither the vector interaction nor the magnetic field are too strong. Also, the presence of strong magnetic fields seems to disfavor the existence of a quark core in hybrid stars.

13 pages, 11 figures

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Cited by in corpus (7)

• Two-solar-mass hybrid stars: a two model description with the Nambu-Jona-Lasinio quark model
• Finite-size effects on the hadron-quark phase transition in neutron stars
• Neutron stars with large quark cores
• Effects of the quark-hadron phase transition on highly magnetized neutron stars
• Dynamical Generation of a Repulsive Vector Contribution to the Quark Pressure
• Neutron stars including the effects of chaotic magnetic fields and the anomalous magnetic moments
• Influence of the vector interaction and an external magnetic field on the isentropes near the chiral critical end point