A Density-dependent van der Waals Model under the GW170817 Constraint

Lourenço, O.; Dutra, M.; Lenzi, César H.; Bhuyan, M.; Biswal, S. K.; Santos, Bruna Michalski dos

doi:10.3847/1538-4357/ab3122

Cited by 22 publications

(31 citation statements)

References 76 publications

(92 reference statements)

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“…We also verify that the calculated dimensionless tidal deformabilites are of the same order as those obtained in relativistic and nonrelativistic hadronic models studied in Refs. [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Tidal deformability of strange stars and the GW170817 event

Lourenço,

Lenzi,

Dutra

et al. 2021

Preprint

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In this work we consider strange stars formed by quark matter in the color-flavor-locked (CFL) phase of color superconductivity. The CFL phase is described by a Nambu-Jona-Lasinio model with four-fermion vector and diquark interaction channels. The effect of the color superconducting medium on the gluons are incorporated into the model by including the gluon self-energy in the thermodynamic potential. We construct parametrizations of the model by varying the vector coupling GV and comparing the results to the data on tidal deformability from the GW170817 event, the observational data on maximum masses from massive pulsars such as the MSP J0740+6620, and the mass/radius fits to NICER data for PSR J003+0451. Our results points out to windows for the GV parameter space of the model, with and without gluon effects included, that are compatible with all these astrophysical constraints, namely, 0.21 < GV /GS < 0.4, and 0.02 < GV /GS < 0.1, respectively. We also observe a strong correlation between the tidal deformabilites of the GW170817 event and GV . Our results indicate that strange stars cannot be ruled out in collisions of compact binaries from the structural point of view.

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Section: Introductionmentioning

confidence: 99%

Tidal deformability of strange stars and the GW170817 event

Lourenço,

Lenzi,

Dutra

et al. 2021

Preprint

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“…We remark that the choice of such numbers for the bulk parameters is based on different theoretical and experimental studies. Saturation density and binding energy are well established closely around the values of 0.15 fm −3 and −16.0 MeV, respectively, in many different hadronic models [32,76,77,78]. Regarding the symmetry energy and its slope, authors of Ref.…”

Section: Bulk Parameters Effectmentioning

confidence: 70%

Neutron star crustal properties from relativistic mean-field models and bulk parameters effects

Dutra,

Lenzi,

de Paula

et al. 2021

Preprint

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We calculate crustal properties of neutron stars, namely, mass (Mcrust), radius (Rcrust) and fraction of moment of inertia (∆I/I) from parametrizations of hadronic relativistic mean-field (RMF) model consistent with symmetric and asymmetric nuclear matter constraints, as well as some stellar boundaries. We verify which one are also in agreement with restrictions of ∆I/I 1.4% and ∆I/I 7% related to the glitching mechanism observed in pulsars, such as the Vela one. The latter constraint explains the glitches phenomenon when entrainment effects are taken into account. Our findings indicate that these parametrizations pass in the glitching limit for a neutron star mass range of M 1.82M⊙ (∆I/I 1.4%), and M1.16M⊙ (∆I/I 7%). We also investigate the influence of nuclear matter bulk parameters on crustal properties and find that symmetry energy is the quantity that produces the higher variations on Mcrust, Rcrust, and ∆I/I. Based on the results, we construct a particular RMF parametrization able to satisfy ∆I/I 7% even at M = 1.4M⊙, the mass value used to fit data from the softer component of the Vela pulsar X-ray spectrum. The model also presents compatibility with observational data from PSR J1614-2230, PSR J0348+0432, and MSP J0740+6620 pulsars, as well as, with data from the Neutron Star Interior Composition Explorer (NICER) mission.

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“…A recent and very important study evidences the existence of quark-matter cores in such objects [66]. The challenge of a detailed study involving relativistic hadronic models [67][68][69] and the PNJL0 model described here and in Ref. [45] is left for a future work.…”

Section: Summary and Concluding Remarksmentioning

confidence: 92%

Thermodynamical phases in a PNJL model at zero temperature

2021

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The confinement/deconfinement transition described the Polyakov–Nambu–Jona–Lasinio (PNJL) model is extended to be operative at zero temperature regime. In this study, the scalar and vector channel interaction strengths of the original PNJL model are modified by introducing a dependence on the traced Polyakov loop. In such a way the effective interactions depend on the quark phase and in turn provides a backreaction of the quarks to the gluonic sector, also at zero temperature. On general grounds from quantum chromodynamics this is an expected feature. The thermodynamics of the extended model (PNJL0) is studied in detail. It presents along with a suitable choice of the Polyakov potential, a first order confined/deconfined quark phase transition even at $$T=0$$ T = 0 . We also show that the vector channel plays an important role in order to allow $$\varPhi \ne 0$$ Φ ≠ 0 solutions for the PNJL0 model. Furthermore, the sensitivity of the combined quarkyonic and deconfinement phases to the vector interaction strength and the proposed parametrization of the Polyakov-loop potential at $$T=0$$ T = 0 allowed to set a window for the bulk values of the relevant parameters.

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A Density-dependent van der Waals Model under the GW170817 Constraint

Cited by 22 publications

References 76 publications

Tidal deformability of strange stars and the GW170817 event

Tidal deformability of strange stars and the GW170817 event

Neutron star crustal properties from relativistic mean-field models and bulk parameters effects

Thermodynamical phases in a PNJL model at zero temperature

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