Finite-size effects at the hadron-quark transition and heavy hybrid stars

Yasutake, Nobutoshi; Łastowiecki, R.; Benić, Sanjin; Blaschke, D.; Maruyama, Toshiki; Tatsumi, Toshitaka

doi:10.1103/physrevc.89.065803

Cited by 118 publications

(118 citation statements)

References 70 publications

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“…This is a simplified approach to the description of the deconfinement phase transition, but it has been shown that if the surface tension of a quark droplet immersed in nuclear matter is high enough, the results obtained are quite realistic [43].…”

Section: The Maxwell Constructionmentioning

confidence: 99%

Neutron stars: From the inner crust to the core with the (extended) Nambu–Jona-Lasinio model

2016

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Nucleonic matter is described within an SU(2) extended Nambu-Jona-Lasinio (NJL) model. Several parametrizations with different nuclear matter saturation properties are proposed. At subsaturation, nuclear pasta phases are calculated within two methods: the coexistence-phases approximation and the compressible liquid drop model, with the surface tension coefficient determined using a geometrical approach at zero temperature. A unified equation of state of stellar matter for the inner crust, with the nuclear pasta phases, and the core is calculated. The mass and radius of neutron stars within this framework are obtained for several families of hadronic and hybrid stars. The quark phase of hybrid stars is described within the SU(3) NJL model including a vector term. Stellar macroscopic properties are in accordance with some of the recent results in the literature.

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Section: The Maxwell Constructionmentioning

confidence: 99%

Neutron stars: From the inner crust to the core with the (extended) Nambu–Jona-Lasinio model

2016

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“…In Fischer et al (2011), a Gibbs construction based on tdBag as the quark matter EoS at finite temperatures has been employed for applications in astrophysics. Yasutake et al (2014) considered pasta structures at the quark-hadron interface and compared the results with standard Maxwell and Gibbs constructions. Further alternative approaches for the construction of possible quark-hadron phase transitions were discussed in Masuda et al (2013) and Kojo et al (2015).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Chiral Symmetry Restoration and Deconfinement Consequences for the QCD Phase Diagram

Klähn

Fischer

Hempel

2017

ApJ

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For studies of quark matter in astrophysical scenarios, the thermodynamic bag model is commonly employed. Although successful, it does not account for dynamical chiral symmetry breaking and repulsions due to the vector interaction which is crucial to explain recent observations of massive, two solar mass neutron stars. In Klähn & Fischer we developed the novel vBag quark matter model which takes these effects into account. This article extends vBag to finite temperatures and isospin asymmetry. Another particular feature of vBag is the determination of the deconfinement bag constant B dc from a given hadronic equation of state in order to ensure that chiral and deconfinement transitions coincide. We discuss consequences of this novel approach for the phase transition construction, the phase diagram, and implications for protoneutron stars.

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“…Steiner et al 2013;Masuda et al 2013;Orsaria et al 2013;Alford et al 2013;Hebeler et al 2013;Inoue et al 2013;Klähn et al 2013;Fraga et al 2013;Yasutake et al 2014;Yamamoto et al 2014). More precisely, hybrid EoS can be decomposed into three parts: (a) low-density nuclear matter; (b) high-density exotic matter such as hyperons or quarks; (c) the phase transition region between low-and high-density parts.…”

Section: Introductionmentioning

confidence: 99%

A new quark-hadron hybrid equation of state for astrophysics

Benić

Blaschke

Alvarez-Castillo

et al. 2015

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Aims. We present a new microscopic hadron-quark hybrid equation of state model for astrophysical applications, from which compact hybrid star configurations are constructed. These are composed of a quark core and a hadronic shell with a first-order phase transition at their interface. The resulting mass-radius relations are in accordance with the latest astrophysical constraints. Methods. The quark matter description is based on a quantum chromodynamics (QCD) motivated chiral approach with higher-order quark interactions in the Dirac scalar and vector coupling channels. For hadronic matter we select a relativistic mean-field equation of state with density-dependent couplings. Since the nucleons are treated in the quasi-particle framework, an excluded volume correction has been included for the nuclear equation of state at suprasaturation density which takes into account the finite size of the nucleons. Results. These novel aspects, excluded volume in the hadronic phase and the higher-order repulsive interactions in the quark phase, lead to a strong first-order phase transition with large latent heat, i.e. the energy-density jump at the phase transition, which fulfils a criterion for a disconnected third-family branch of compact stars in the mass-radius relationship. These twin stars appear at high masses (∼2 M ) that are relevant for current observations of high-mass pulsars.Conclusions. This analysis offers a unique possibility by radius observations of compact stars to probe the QCD phase diagram at zero temperature and large chemical potential and even to support the existence of a critical point in the QCD phase diagram.

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Finite-size effects at the hadron-quark transition and heavy hybrid stars

Cited by 118 publications

References 70 publications

Neutron stars: From the inner crust to the core with the (extended) Nambu–Jona-Lasinio model

Neutron stars: From the inner crust to the core with the (extended) Nambu–Jona-Lasinio model

Simultaneous Chiral Symmetry Restoration and Deconfinement Consequences for the QCD Phase Diagram

A new quark-hadron hybrid equation of state for astrophysics

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