Connecting neutron star observations to the high density equation of state of a quasiparticle model

Yan, Yan; Cao, Jiling; Luo, Xiang-Qian; Sun, Weimin; Zong, Hong-Shi

doi:10.1103/physrevd.86.114028

Cited by 39 publications

(25 citation statements)

References 49 publications

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“…By definition, the EOS of QCD at zero temperature and nonzero chemical potential is [37] P (µ) = P (µ = 0) + µ 0 dµ ′ ρ(µ ′ ), (12) and the relation between the energy density of the system and its pressure is expressed as [38,39]…”

Section: The Eos Of Quark Matter With 2+1 Flavors Njl Model and Ptrmentioning

confidence: 99%

Studies of the hybrid star structure within 2+1 flavors NJL model

Zhang

Zhao

et al. 2017

Phys. Rev. D

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In this paper we use the equation of state (EOS) of 2+1 flavors Nambu-Jona-Lasinio (NJL) model to study the structure of compact stars. To avoid the ultraviolet divergence, we employ the proper-time regularization (PTR) with an ultraviolet cutoff. For comparison, we fix three sets of parameters, where the constraints of chemical equilibrium and electric charge neutrality conditions are taken into consideration. With a certain interpolation method in the crossover region, we construct three corresponding hybrid EOSs but find that the maximum masses of hybrid stars in the three different cases don't differ too much. It should be pointed out that, the results we get are in accordance with the recent astro-observation PSR J0348+0432, PSR J1614-2230, PSR J1946+3417.

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Section: The Eos Of Quark Matter With 2+1 Flavors Njl Model and Ptrmentioning

confidence: 99%

Studies of the hybrid star structure within 2+1 flavors NJL model

Zhang

Zhao

et al. 2017

Phys. Rev. D

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“…This phase transition is expected to be a e-mail: zonghs@nju.edu.cn produced in on-going heavy-ion collision experiments, such as the BNL Relativistic Heavy-Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC) [5][6][7][8]. In addition, high density QCD matter at low temperature is anticipated in the compact stars physics [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Critical behaviors near the (tri-)critical end point of QCD within the NJL model

Cui

et al. 2015

Eur. Phys. J. C

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We investigate the dynamical chiral symmetry breaking and its restoration at finite density and temperature within the two-flavor Nambu-Jona-Lasinio model, and mainly focus on the critical behaviors near the critical end point (CEP) and tricritical point (TCP) of quantum chromodynamics. The multi-solution region of the Nambu and Wigner ones is determined in the phase diagram for the massive and massless current quark, respectively. We use the various susceptibilities to locate the CEP/TCP and then extract the critical exponents near them. Our calculations reveal that the various susceptibilities share the same critical behaviors for the physical current quark mass, while they show different features in the chiral limit.

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“…Recently, based on the observation of pulsar and the recent binary neutron star (BNS) merger event GW170817, Ref. [76] gives a quite narrow limitation to B, that is, from (134.1 MeV) 4 to Now we can get the relation between the energy density of the quark matter and its pressure [77,78]…”

Section: Eos Of Hadronic Mattermentioning

confidence: 99%

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

Zhang

Yan

et al. 2018

Phys. Rev. D

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In this paper, we use the equation of state based on a modification of 2+1 flavors Nambu-Jona-Lasinio (NJL) model to study the quark matter of hybrid stars. For comparison, we utilize five EOSs of the relativistic mean-field (RMF) model to describe the hadronic phase. With the 3window crossover interpolation approach, we try to construct relatively soft hybrid EOSs but find the maximum masses of hybrid stars do not differ too much. The results are quite close to two solar mass, which is consistent with the mass constraint of PSR J0348+0432. Furthermore it is noteworthy that the heaviest stable stars have central densities higher than that of the deconfinement transition thus suggesting a pure quark core in the hybrid star.

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Connecting neutron star observations to the high density equation of state of a quasiparticle model

Cited by 39 publications

References 49 publications

Studies of the hybrid star structure within 2+1 flavors NJL model

Studies of the hybrid star structure within 2+1 flavors NJL model

Critical behaviors near the (tri-)critical end point of QCD within the NJL model

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

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