Two-solar-mass hybrid stars: A two model description using the Nambu–Jona-Lasinio quark model

Pereira, Renan Câmara; Costa, Pedro; Providência, Constança

doi:10.1103/physrevd.94.094001

Cited by 56 publications

(77 citation statements)

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“…The recent observation of neutron stars with masses of approximately 2M ⊙ [52,53] places a strong limit on the equation of state of cold and dense matter. Studies performed including vector interactions typically lead to an increase of the calculated stellar masses [54][55][56], and it has been suggested that without these, the two-solar mass constraint cannot be satisfied. Therefore it could be interesting to study the effect of vector interactions on the Although within the present type of models the impact of compact star conditions on the behavior of dense quark matter in the absence of magnetic fields was already analyzed almost 15 years ago [37,49], we find it useful to review some issues concerning the parameter dependence of the results.…”

Section: Discussionmentioning

confidence: 99%

Magnetized color superconducting quark matter under compact star conditions: Phase structure within the SU(2)f NJL model

et al. 2017

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The properties of magnetized color superconducting cold dense quark matter under compact star conditions are investigated using an SU (2) f Nambu Jona-Lasinio (NJL)-type model in which the divergences are treated using a magnetic field independent regularization scheme in order to avoid unphysical oscillations. We study the phase diagram for several model parametrizations. The features of each phase are analyzed through the behavior of the chiral and superconducting condensates together with the different particle densities for increasing chemical potential or magnetic field. While confirming previous results derived for the zero magnetic field or isospin symmetric matter case, we show how the phases are modified in the presence of β-equilibrium as well as color and electric charge neutrality conditions.

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Section: Discussionmentioning

confidence: 99%

Magnetized color superconducting quark matter under compact star conditions: Phase structure within the SU(2)f NJL model

et al. 2017

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“…Some examples of the application of this model and its improved versions include hadron phenomenology and behavior at finite temperature and/or density, modeling neutron star matter and study of the QCD phase diagram [14][15][16][17]. Understanding the phase diagram of QCD is one of the most challenging and interesting topics in modern physics.…”

Section: Introductionmentioning

confidence: 99%

One-meson-loop NJL model: Effect of collective and noncollective excitations on the quark condensate at finite temperature

Pereira

Costa

2020

Phys. Rev. D

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We explore the effect of including quantum fluctuations in the two flavor Nambu−Jona-Lasinio model at finite temperature. This is accomplished, in a symmetry preserving way, by including collective and noncollective modes in the one-meson-loop gap equation which originate from poles and branch cuts in the complex plane, respectively. The inclusion of a boson cutoff, Λ b , is necessary to regularize the meson-loop momenta. This new parameter is used to study the influence of going beyond the usual mean field approximation in the quark condensate. As the temperature increases, chiral symmetry tends to get restored, the collective modes melt and only noncollective modes contribute to the quark condensate. With the inclusion of such modes, the quark condensate at finite temperature has a different behavior than at mean field level that will be explored. * renan.pereira@student.uc.pt † pcosta@uc.pt arXiv:2003.08430v1 [hep-ph]

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“…Whenever possible, the binodal sections are obtained. We include in the quark model a vector contribution that has proved to make the quark EoS stiffer and may have important consequences on the structure of hybrid or pure quark compact stars [33][34][35][36]. In particular, the inclusion of this term gives rise to larger star masses although with smaller quark cores in the case of hybrid stars.…”

Section: Introductionmentioning

confidence: 99%

Hadron-quark phase transition: the QCD phase diagram and stellar conversion

Graeff

Alloy²,

Marquez³

et al. 2019

J. Cosmol. Astropart. Phys.

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Different extensions of the Nambu-Jona-Lasinio model, known to satisfy expected QCD chiral symmetry aspects, are used to investigate a possible hadron-quark phase transition at zero temperature and to build the corresponding binodal sections. We have shown that the transition point is very sensitive to the model parameters and that both pressure and chemical potential increase drastically with the increase of the vector interaction strength in the quark sector. Within the same framework, the possibility of quark and hybrid star formation is analyzed. The same conclusions drawn before with respect to the coexistence pressure and chemical potentials are reinforced. We conclude that even if a transition from a metastable hadronic star to a quark star is thermodinamically possible, it is either energetically forbidden or gives rise to a blackhole. Nevertheless, conversions from metastable to hybrid stars are possible, but the mass difference between both compact objects is very small, never larger than 0.2 M ⊙ .

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Two-solar-mass hybrid stars: A two model description using the Nambu–Jona-Lasinio quark model

Cited by 56 publications

References 57 publications

Magnetized color superconducting quark matter under compact star conditions: Phase structure within the SU(2)f NJL model

Magnetized color superconducting quark matter under compact star conditions: Phase structure within the SU(2)f NJL model

One-meson-loop NJL model: Effect of collective and noncollective excitations on the quark condensate at finite temperature

Hadron-quark phase transition: the QCD phase diagram and stellar conversion

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