Hybrid Stars in the Framework of NJL Models

Contrera, Gustavo A.; Orsaria, M.; Ranea‐Sandoval, Ignacio F.; Weber, Fridolin

doi:10.1142/s2010194517600266

Cited by 5 publications

(5 citation statements)

References 30 publications

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“…It has been shown that vector interaction contributions in the description of quark matter plays a crucial role in the description of massive hybrid stars in agreement with observational data [25,59,76,92,[133][134][135][136][137][138]. These contributions have been investigated for different quark models [135,137,138]), and applied to neutron stars studies [59,76,[134][135][136].…”

Section: B Quark Phasementioning

confidence: 93%

“…[86][87][88][89][90]). Both scenarios have been applied to describe hybrid stars [27,61,74,75,91,92], indicating that the internal composition of stars can change substantially. In particular, the occurrence of a sharp phase transition to quark matter can in some cases allow for the appearance of a third family of compact stars and, consequently, for twin star configurations in which two stars have the same gravitational mass but different radii and composition [58,65,93].…”

Section: Introductionmentioning

confidence: 99%

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Constraining Strangeness in Dense Matter with GW170817

Gomes

Char

Schramm

2019

ApJ

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Particles with strangeness content are predicted to populate dense matter, modifying the equation of state of matter inside neutron stars as well as their structure and evolution. In this work, we show how the modeling of strangeness content in dense matter affects the properties of isolated neutrons stars and the tidal deformation in binary systems. For describing nucleonic and hyperonic stars we use the many-body forces model (MBF) at zero temperature, including the φ mesons for the description of repulsive hyperon-hyperon interactions. Hybrid stars are modeled using the MIT Bag Model with vector interaction (vMIT) in both Gibbs and Maxwell constructions, for different values of bag constant and vector interaction couplings. A parametrization with a Maxwell construction, which gives rise to third family of compact stars (twin stars), is also investigated. We calculate the tidal contribution that adds to the post-Newtonian point-particle corrections, the associated love number for sequences of stars of different composition (nucleonic, hyperonic, hybrid and twin stars), and determine signatures of the phase transition on the gravitational waves in the accumulated phase correction during the inspirals among different scenarios for binary systems. On the light of the recent results from GW170817 and the implications for the radius of ∼ 1.4 M⊙ stars, our results show that hybrid stars can only exist if a phase transition takes place at low densities close to saturation.

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Section: B Quark Phasementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Constraining Strangeness in Dense Matter with GW170817

Gomes

Char

Schramm

2019

ApJ

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“…This would not be the case if the Maxwell construction were used to model the phase equilibrium between quarks and hadrons, in which case the pressure throughout the mixed phase is constant. For that reason, the mixed phase would strictly be excluded from neutron stars, but small cores made entirely of quark matter may still be possible in neutron stars close the maximum-mass model (see, for instance, Refrences [61,62], and references therein).…”

Section: Quark-hadron Mixed Phasementioning

confidence: 99%

Quark Deconfinement in Rotating Neutron Stars

et al. 2017

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Abstract:In this paper, we use a three flavor non-local Nambu-Jona-Lasinio (NJL) model, an improved effective model of Quantum Chromodynamics (QCD) at low energies, to investigate the existence of deconfined quarks in the cores of neutron stars. Particular emphasis is put on the possible existence of quark matter in the cores of rotating neutron stars (pulsars). In contrast to non-rotating neutron stars, whose particle compositions do not change with time (are frozen in), the type and structure of the matter in the cores of rotating neutron stars depends on the spin frequencies of these stars, which opens up a possible new window on the nature of matter deep in the cores of neutron stars. Our study shows that, depending on mass and rotational frequency, up to around 8% of the mass of a massive neutron star may be in the mixed quark-hadron phase, if the phase transition is treated as a Gibbs transition. We also find that the gravitational mass at which quark deconfinement occurs in rotating neutron stars varies quadratically with spin frequency, which can be fitted by a simple formula.

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“…There are several works where the NJL model has been employed to describe a possible quark matter phase in NSs (see for example Refs. [51][52][53]. Local and non-local extensions of the NJL model at zero temperature can be used to study hybrid stars with and/or without a quark-hadron mixed phases in their inner cores to explore the role of quark deconfinement in NSs.…”

Section: Astrophysical Applications Of Njl Eosmentioning

confidence: 99%

Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model

et al. 2019

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We study local and non-local Polyakov Nambu-Jona-Lasinio models and analyze their respective phase transition diagram. We construct hybrid stars using the zero temperature limit of the local and non-local versions of Nambu-Jona-Lasinio model for quark matter and the modern GM1(L) parametrization of the non-linear relativistic mean field model for hadronic matter. We compare our models with data from PSR J1614-2230 and PSR J0343+0432 and also from GW170817 and its electromagnetic counterpart GRB170817A and AT2017gfo. We study observational signatures of the appearance of a mixed phase as a result of modeling a phase transition that mimics the Gibbs formalism and compare the results with the sharp first-order phase transition obtained using the Maxwell construction. We also study in detail the g-mode associated with discontinuities in the equation of state, and calculate non-radial oscillation modes using relativistic Cowling approximation.

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Hybrid Stars in the Framework of NJL Models

Cited by 5 publications

References 30 publications

Constraining Strangeness in Dense Matter with GW170817

Constraining Strangeness in Dense Matter with GW170817

Quark Deconfinement in Rotating Neutron Stars

Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model

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