Nuclear pasta phases within the quark-meson coupling model

Grams, Guilherme; Santos, A. M.; Panda, P. K.; Providência, Constança; Menezes, D. P.

doi:10.1103/physrevc.95.055807

Cited by 21 publications

(25 citation statements)

References 57 publications

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“…The construction of the nuclear pasta phase obeys the well-known Gibbs conditions for phase coexistence and in the present work we opt for the coexistence phase (CP) method extensively discussed in previous works [12,14,[24][25][26], which we do not repeat here. The particle chemical potentials are defined in terms of a baryon chemical potential (μ B ) and a charge chemical potential (μ Q ), which are the quantities enforced as identical in both phases, such as where q j is the electric charge of each particle.…”

Section: Formalismmentioning

confidence: 99%

“…We include a ω-ρ meson coupling term as in Refs. [14,[18][19][20][21] because this term was shown to control the symmetry energy and its slope, resulting in equations of state that can satisfy most of the nuclear matter saturation properties and observational constraints. The Lagrangian density reads…”

Section: Formalismmentioning

confidence: 99%

“…Such competition generates a frustrated system [12,13] and the name pasta refers to specific shapes acquired by matter, namely, droplets, bubbles, rods, tubes, and slabs. The inclusion of the pasta phase in the EOS practically * cp@fis.uc.pt does not influence the stellar maximum masses but certainly affects the radii [14,15]. So far, the pasta phase has only been treated with nucleonic degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

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Hyperons in the nuclear pasta phase

Menezes

Providência

2017

Phys. Rev. C

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We have investigated under which conditions hyperons (particularly s and − s) can be found in the nuclear pasta phase. As the density and temperature are larger and the electron fraction is smaller, the probability is greater that these particles appear, but always in very small amounts. hyperons only occur in gas and in smaller amounts than would occur if matter were homogeneous, never with abundancies above 10 −5 . The amount of − in the gas is at least two orders of magnitude smaller and can be disregarded in practical calculations.

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Section: Formalismmentioning

confidence: 99%

Section: Formalismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hyperons in the nuclear pasta phase

Menezes

Providência

2017

Phys. Rev. C

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“…The model parameters were adjusted to constraints on the slope parameter of the nuclear symmetry energy at saturation density. The spinodal surfaces and predictions of the instability regions obtained in the QMC and QMCδ models were compared with results of mean field relativistic models and discussed.Grams et al[29] studied the pasta phases in low density regions of nuclear and neutron star matter within the context of the QMC model. Fixed proton fractions as well as nuclear matter in β-equilibrium at zero temperature were considered.…”

mentioning

confidence: 99%

Quark–Meson-Coupling (QMC) model for finite nuclei, nuclear matter and beyond

Guichon

Stone

Thomas

2018

Progress in Particle and Nuclear Physics

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The Quark-Meson-Coupling model, which self-consistently relates the dynamics of the internal quark structure of a hadron to the relativistic mean fields arising in nuclear matter, provides a natural explanation to many open questions in low energy nuclear physics, including the origin of many-body nuclear forces and their saturation, the spin-orbit interaction and properties of hadronic matter at a wide range of densities up to those occurring in the cores of neutron stars.Here we focus on four aspects of the model (i) a full comprehensive survey of the theory, including the latest developments, (ii) extensive application of the model to ground state properties of finite nuclei and hypernuclei, with a discussion of similarities and differences between the QMC and Skyrme energy density functionals, (iii) equilibrium conditions and composition of hadronic matter in cold and warm neutron stars and their comparison with the outcome of relativistic mean-field theories and, (iv) tests of the fundamental idea that hadron structure changes in-medium.

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“…[25], the density region of nonspherical nuclei was calculated by using a parametrized Thomas-Fermi approximation, which was found to be sensitive to the symmetry energy slope L. In our previous work [12], a selfconsistent Thomas-Fermi approximation was employed to study the pasta structures presented in the inner crust of neutron stars and we found that only spherical nuclei can be formed before the crust-core transition for L ≥ 80 MeV, whereas nonspherical pasta phases may appear for smaller values of L (e.g., L = 40 MeV). A similar calculation using the coexisting phases method in the quarkmeson coupling model with L = 69 and 90 MeV was performed and showed that only droplets could present in the inner crust of neutron stars [71].…”

Section: Introductionmentioning

confidence: 99%

Nuclear pasta and symmetry energy in the relativistic point-coupling model

Ji,

Hu,

Shen

2021

Preprint

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Nonuniform structure of low-density nuclear matter, known as nuclear pasta, is expected to appear not only in the inner crust of neutron stars but also in core-collapse supernova explosions and neutron-star mergers. We perform fully three-dimensional calculations of inhomogeneous nuclear matter and neutron-star matter in the low-density region using the Thomas-Fermi approximation. The nuclear interaction is described in the relativistic mean-field approach with the point-coupling interaction, where the meson exchange in each channel is replaced by the contact interaction between nucleons. We investigate the influence of nuclear symmetry energy and its density dependence on pasta structures by introducing a coupling term between the isoscalar-vector and isovector-vector interactions. It is found that the properties of pasta phases in the neutron-rich matter are strongly dependent on the symmetry energy and its slope. In addition to typical shapes like droplets, rods, slabs, tubes, and bubbles, some intermediate pasta structures are also observed in cold stellar matter with a relatively large proton fraction. We find that nonspherical shapes are unlikely to be formed in neutron-star crusts, since the proton fraction obtained in β equilibrium is rather small. The inner crust properties may lead to a visible difference in the neutron-star radius.

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Nuclear pasta phases within the quark-meson coupling model

Cited by 21 publications

References 57 publications

Hyperons in the nuclear pasta phase

Hyperons in the nuclear pasta phase

Quark–Meson-Coupling (QMC) model for finite nuclei, nuclear matter and beyond

Nuclear pasta and symmetry energy in the relativistic point-coupling model

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