Nuclear “pasta” structures and the charge screening effect

Maruyama, Toshiki; Tatsumi, Toshitaka; Voskresensky, D. N.; Tanigawa, Tomonori; Chiba, Satoshi

doi:10.1103/physrevc.72.015802

Cited by 213 publications

(350 citation statements)

References 34 publications

(58 reference statements)

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“…Reference [4] discusses the influence of a correct treatment of the Coulomb interaction on the extension of each pasta geometry. In particular, in a calculation excluding the Coulomb field and including the Coulomb energy, as was done in the CP calculation, the bubble geometry was not present with Y p = 0.1, and the slab configuration was found in a wider density range with Y p = 0.3.…”

Section: Resultsmentioning

confidence: 99%

“…In 3D we consider spherical symmetry, in two dimensions (2D) we assume axial symmetry around the z axis, and in one dimension (1D) reflection symmetry is imposed. In the TF approximation, fields are assumed to vary slowly so that baryons can be treated as moving in locally constant fields at each point [4]. In this approximation, the surface effects are treated self-consistently.…”

Section: B Thomas-fermi and Coexisting-phases Approximationsmentioning

confidence: 99%

“…At low densities, the frustrated system called the "pasta phase," which is caused by the competition between the Coulomb interaction and the strong force, appears. It is constituted by different configurations whose geometry changes as the density increases [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Light clusters, pasta phases, and phase transitions in core-collapse supernova matter

2015

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The pasta phase in core-collapse supernova matter (finite temperatures and fixed proton fractions) is studied within relativistic mean-field models. Three different calculations are used for comparison: the Thomas-Fermi, the coexisting phases, and the compressible liquid drop approximations. The effects of including light clusters in nuclear matter and the densities at which the transitions between pasta configurations and to uniform matter occur are also investigated. The free energy, pressure, entropy, and chemical potentials in the range of particle number densities and temperatures expected to cover the pasta region are calculated. Finally, a comparison with a finite-temperature Skyrme-Hartree-Fock calculation is drawn.

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Section: Resultsmentioning

confidence: 99%

Section: B Thomas-fermi and Coexisting-phases Approximationsmentioning

confidence: 99%

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Light clusters, pasta phases, and phase transitions in core-collapse supernova matter

2015

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“…Then a fluid core exists in higher density region. In most part of the crust, nuclei form a bcc lattice due to the Coulomb interaction, while the existence of exotic nuclear shapes at the bottom of crust is also suggested in the recent studies [33,34,35,36,37,38,39,40]. According to such studies, with increasing density, the shape of nuclear matter changes from sphere (bcc lattice 1 ), to cylinder, slab, cylindrical hole, spherical bubble, and uniform matter (inner fluid core), which is collectively called "nuclear pasta.…”

Section: Introductionmentioning

confidence: 99%

“…Namely, whether nonuniform (pasta) structures appear in the HQ mixed phase is subject to a balance between the surface tension and the Coulomb repulsion [44,48], which is similar to the situation in the crust [38] and kaon condensed matter [49]. However, to determine the surface tension with the experiments on the Earth is quite difficult because temperature becomes too high for the HQ mixed phase to appear during the relativistic heavy-ion collisions.…”

Section: Introductionmentioning

confidence: 99%

Shear oscillations in the hadron–quark mixed phase

2013

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Inside neutron stars, the hadron-quark mixed phase is expected during the first order phase transition from the hadron phase to the quark phase. The geometrical structure of the mixed phase strongly depends on the surface tension at the hadron-quark interface. We evaluate the shear modulus which is one of the specific properties of the hadron-quark mixed phase. As an application, we study shear oscillations due to the hadron-quark mixed phase in neutron stars. We find that the frequencies of shear oscillations depend strongly on the surface tension; with a fixed stellar mass, the fundamental frequencies are almost proportional to the surface tension. Thus, one can estimate the value of surface tension via the observation of stellar oscillations with the help of the information on the stellar mass.

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Pasta Phases Within the QMC Model

Grams

Santos

Panda

et al. 2020

Recent Progress in Few-Body Physics

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In this work the low density regions of nuclear and neutron star matter are studied. The search for the existence of pasta phases in this region is performed within the context of the quark-meson coupling (QMC) model, which incorporates quark degrees of freedom. Fixed proton fractions are considered, as well as nuclear matter in beta equilibrium at zero temperature. We discuss the recent attempts to better understand the surface energy in the coexistence phases regime and we present results that show the existence of the pasta phases subject to some choices of the surface energy coefficient. We also analyze the influence of the nuclear pasta on some neutron star properties. The equation of state containing the pasta phase will be part of a complete grid for future use in supernova simulations.PACS numbers: 26.60. Kp, 26.50.+x, 95.30.Tg, 24.10.Jv

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Nuclear “pasta” structures and the charge screening effect

Abstract: Non uniform structures of the nucleon matter at subnuclear densities are numerically studied by means of the density functional theory with relativistic mean-fields coupled with the electric field. A particular role of the charge screening effects is demonstrated.

Cited by 213 publications

References 34 publications

Light clusters, pasta phases, and phase transitions in core-collapse supernova matter

Light clusters, pasta phases, and phase transitions in core-collapse supernova matter

Shear oscillations in the hadron–quark mixed phase

Pasta Phases Within the QMC Model

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