Studies of the structure of massive hybrid stars within a modified NJL model

Li, Chengming; Zhang, Jinli; Yan, Yan; Huang, Yun‐Feng; Zong, Hong-Shi

doi:10.1103/physrevd.97.103013

Cited by 42 publications

(31 citation statements)

References 92 publications

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“…[25][26][27][28] or phenomenological approaches, such as bag models, Nambu-Jona-Lasinio (NJL)-type models or the quark-meson coupling model in mean field approximation have been employed to describe quark matter in this intermediate density regime, e.g. [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Some models include constraints from lattice calculations, see e.g.…”

Section: Introductionmentioning

confidence: 99%

Nonperturbative quark matter equations of state with vector interactions

Otto

Oertel

Schaefer

2020

Eur. Phys. J. Spec. Top.

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Nonperturbative equations of state (EoSs) for two and three quark flavors are constructed with the functional renormalization group (FRG) within a quark-meson model truncation augmented by vector mesons for low temperature and high density. Based on previous FRG studies without repulsive vector meson interactions the influence of isoscalar vector ω- and ϕ-mesons on the dynamical fluctuations of quarks and (pseudo)scalar mesons is investigated. The grand potential as well as vector meson condensates are evaluated as a function of quark chemical potential and the quark matter EoS in β-equilibrium is applied to neutron star (NS) physics. The tidal deformability and mass-radius relations for hybrid stars from combined hadronic and quark matter EoSs are compared for different vector couplings. We observe a significant impact of the vector mesons on the quark matter EoS such that the resulting EoS is sufficiently stiff to support two-solar-mass neutron stars.

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Section: Introductionmentioning

confidence: 99%

Nonperturbative quark matter equations of state with vector interactions

Otto

Oertel

Schaefer

2020

Eur. Phys. J. Spec. Top.

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“…2 in [9] and [8,17,19,34,35,39,40,[45][46][47][48][49][50][51][52][61][62][63][64][65][66][67][68][69][70][71][72][73]. Reason (ii) could be related to first-order phase transitions [38,44,52,[74][75][76][77][78] or an "unphase transition", as predicted by the quarkionic model [35,40,42,48,79,80] or crossover transitions/Gibbs constructions to/with (stiff) quark matter [36,37,45,51,[81][82][83]…”

mentioning

confidence: 99%

The slope, the hill, the drop, and the swoosh: Learning about the nuclear matter equation of state from the binary Love relations

Tan,

Dexheimer,

Noronha-Hostler

et al. 2021

Preprint

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Analyses that connect astrophysical observations of neutron stars with nuclear matter properties sometimes rely on equation-of-state insensitive relations. We show that the slope of the binary Love relations (i.e. between the tidal deformabilities of binary neutron stars) encodes the rate of change of the nuclear matter speed of sound below three times nuclear saturation density. Twin stars lead to relations that present a signature "hill," "drop," and "swoosh" due to the second (mass-radius) stable branch, requiring a new description of the binary love relations.

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“…That is to say a constant G does not meet these requirements. In [19] they investigate how to extract the feedback of quark from gluon propagator and get Eq.4.The parameter set used in this paper is m = 5.6MeV , Λ = 587.9MeV , G 1 = 5.564 × 10 −6 MeV −2 and G 2 = −3.16 × 10 −14 MeV −5 , which is proved to be successful in fitting the quark condensate to the Lattice results at finite temperature [20].…”

Section: Moments By Njl Modelmentioning

confidence: 99%

Baryon number fluctuations in quasi-particle model

2017

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Baryon number fluctuations are sensitive to the QCD phase transition and the QCD critical point. According to the Feynman rules of finite-temperature field theory, we calculated various order moments and cumulants of the baryon number distributions in the quasi-particle model of the quark-gluon plasma. Furthermore, we compared our results with the experimental data measured by the STAR experiment at RHIC. It is found that the experimental data can be well described by the model for the colliding energies above 30 GeV and show large discrepancies at low energies. This puts a new constraint on the qQGP model and also provides a baseline for the QCD critical point search in heavy-ion collisions at low energies. Moments of net-baryon distributions and quasi-particle model of QGPLattice QCD calculations indicate that at baryon chemical potential μ B = 0, the transition from the quark-gluon plasma (QGP) to a hadron gas is a smooth crossover, while at large μ B , the phase transition is of first order. The end point of the first order phase transition boundary is the so- On the other hand, the moments of the baryon number are related to the various order baryon number susceptibilities [4]. In order to cancel the volume, the products of the moments, Sσ and κσ 2 , are constructed as the experimental observables. The results in RHIC of these observables show a centrality and energy dependence [5], which are not reproduced by a non-CP transport and hadron resonance gas model calculations. The deviations of Sσ and κσ 2 below the Skellam expectation are qualitatively consistent with a QCDbased model which includes a CP [6]. The energy dependence of the κσ 2 of net-proton distributions in Au+Au collisions show non-monotonic behavior, which is consistent with being close to the CP [7,8].In this paper we apply the quasi-particle model (qQGP) of the quark-gluon plasma (QGP) to calculate the moments of the net-baryon distributions. The qQGP model was first proposed by Peshier et al. [9] to study the non-ideal equation of state (EoS) by lattice QCD results. Instead of real quarks and gluons with QCD interactions, the system is considered to be made up of non-interacting quasi-quarks and quasigluons with thermal masses. Quasi-particles are thought to be quanta of plasma collective modes excited by quarks and gluons through QCD interactions.By now, some approaches have been proposed to study the qQGP model. The effective mass methods [9][10][11][12][13][14], the approaches based on the Polyakov loop [15][16][17][18][19], the approach based on Fermi liquids theory [20][21][22][23][24] and so on. Compared with the first and second approach, the third one is fundamentally different and powerful. Besides reproducing the EoS accurately, it is also successful in predicting the bulk and transport properties of QGP [20][21][22][23][24].Gorenstein and Yang pointed out that the initial quasiparticle model was thermodynamically inconsistent and then 123

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Studies of the structure of massive hybrid stars within a modified NJL model

Cited by 42 publications

References 92 publications

Nonperturbative quark matter equations of state with vector interactions

Nonperturbative quark matter equations of state with vector interactions

The slope, the hill, the drop, and the swoosh: Learning about the nuclear matter equation of state from the binary Love relations

Baryon number fluctuations in quasi-particle model

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