The hadron-quark phase transition in neutron stars

Burgio, G. F.

doi:10.1016/j.nuclphysa.2004.12.064

Cited by 6 publications

(2 citation statements)

References 17 publications

(17 reference statements)

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“…Our results are in line with other works in hybrid star with other hadronic EoS's such as microscopic Brueckner-Hartree-Fock (BHF)-many body theory, relativistic mean feild (RMF) model [5,72,73], APR98 and also Valecka models [74]; all these combined with MIT bag model in which hybrid stars with bag constants of around B=90 MeVfm −3 are stable with pure quark core and the maximum mass is about 1.5M ⊙ . It is to be noted that for large bag constant, bigger than around B=140MeVfm −3 , the stability of the star will be lost.…”

Section: Mit Bag Modelsupporting

confidence: 91%

Hybrid star within the framework of a lowest-order constraint variational method

Khanmohamadi¹,

Moshfegh²,

Tehrani³

2020

Phys. Rev. D

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The hadron-quark phase transition in the core of heavy neutron star has been stuided. For the hadronic sector, we have used the lowest order constraint variational (LOCV) method by employing AV18, AV14, U V14 as well as Reid 68 two-body nucleon-nucleon forces (2BF) supplemented by the phenomenological Urbana-type (UIX) three-body force (TBF). We have adopted the MIT bag model and three-flavor version of Nambu, Jona, Lasinio (NJL) model to describe the quark phase. The Equation of State (EoS) of hybrid star is presented by combining two EoS's of hadronic sector and quark sector of star which are derived from independent models or theories. The hadronquark transition is constructed by considering a sharp phase transition a.k.n. Maxwell construction. The structure of hybrid star is calculated and reported by solving Tolman-Oppenheimer-Volkoff (TOV) equations. Under MIT bag model, stable hybrid star with pure quark phase, as well as hadron-quark mixture in the core is predicted. Where as, under NJL model, hybrid star in the best case scenario, with a mixed but not pure quark phase in the core is predictable. When the AV18 potential supplemented by the TBF is combined with the MIT bag model, the maximum mass of 1.50M⊙(1.945M⊙) would be found for a stable hybrid star with pure quark (mixed phase) core; while the maximum mass of 1.998M⊙ would be calculated under NJL model. A comprehensive analysis on the structure has been conducted for various EoS's of the hadron sector and several parameter sets of the quark EoS's. The results achieved in this study are in strong concurrence with the other calculations reported on this subject.

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Section: Mit Bag Modelsupporting

confidence: 91%

Hybrid star within the framework of a lowest-order constraint variational method

Khanmohamadi¹,

Moshfegh²,

Tehrani³

2020

Phys. Rev. D

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“…Among the sources of model dependence are [1]: (1) the manybody framework used for the determination of the EOS, (2) the model used for the bare NN interaction, (3) the kinds of hadrons/leptons included in the description of electrically neutral NS matter, (4) the treatment of pion and kaon condensations, (5) including the effects of fast rotation, (6) allowing for a phase transition from confined hadronic matter to deconfined quark matter. The possibility of such transition has attracted great interest over the last 30 years [18,19,20,21]. It is generally agreed upon that the high pressure found in the core of a neutron star creates an ideal physical environment for hadrons to transform into quark matter -a state of matter of practically infinite lifetime.…”

Section: Introductionmentioning

confidence: 99%

Neutron star properties and the equation of state of neutron-rich matter

Krastev

Sammarruca

2006

Phys. Rev. C

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We calculate total masses and radii of neutron stars (NS) for pure neutron matter and nuclear matter in β-equilibrium. We apply a relativistic nuclear matter equation of state (EOS) derived from Dirac-Brueckner-Hartree-Fock (DBHF) calculations. We use realistic nucleon-nucleon (NN) interactions defined in the framework of the meson exchange potential models. Our results are compared with other theoretical predictions and recent observational data. Suggestions for further study are discussed.

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Phase Structure in a Quark Mass Density-and-Temperature-Dependent Model

Xin-Jian

Peng

Shen

2007

Commun. Theor. Phys.

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The phase diagram of bulk quark matter in equilibrium with a finite hadronic gas is studied. Different from previous investigations, we treat the quark phase with the quark mass density-and-temperature-dependent model to take the strong quark interaction into account, while the hadron phase is treated by hard core repulsion factor. It is found that the phase diagram in this model is, in several aspects, different from those in the conventional MIT bag model, especially at high temperature. The new phase diagram also has strong effects on the mass-radius relation of compact hybrid stars.

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The hadron-quark phase transition in neutron stars

Cited by 6 publications

References 17 publications

Hybrid star within the framework of a lowest-order constraint variational method

Hybrid star within the framework of a lowest-order constraint variational method

Neutron star properties and the equation of state of neutron-rich matter

Phase Structure in a Quark Mass Density-and-Temperature-Dependent Model

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