The quark-meson coupling model and chiral symmetry

Saito, Koichi; Melnitchouk, Wally

doi:10.1063/1.3479351

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…This indicates that the chiral Lagrangian with the four-nucleon terms could be satisfactorily describing the bulk property of nuclear matter as the Walecka model [6] does in the mean field approximation. The role of the four-Fermi interaction in establishing a bridge between the chiral quark-meson coupling model and chiral Lagrangian within the mean field approximation was discussed in [7]. The effect of the four-Fermi interaction on pion and kaon condensation was delved into in [8].…”

Section: Introductionmentioning

confidence: 99%

Four-nucleon contact interactions from holographic QCD

Kim

2012

J. High Energ. Phys.

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We calculate the low energy constants of four-nucleon interactions in an effective chiral Lagrangian in holographic QCD. We start with a D4-D8 model to obtain meson-nucleon interactions and then integrate out massive mesons to obtain the four-nucleon interactions in 4D. We end up with two low energy constants at the leading order and seven of them at the next leading order, which is consistent with the effective chiral Lagrangian. The values of the low energy constants are evaluated with the first five Kaluza-Klein resonances.Comment: 28 page

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Section: Introductionmentioning

confidence: 99%

Four-nucleon contact interactions from holographic QCD

Kim

2012

J. High Energ. Phys.

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Effects of Fock term, tensor coupling and baryon structure variation on a neutron star

2012

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The equation of state for neutron matter is calculated within relativistic Hartree-Fock approximation. The tensor couplings of vector mesons to baryons are included, and the change of baryon internal structure in matter is also considered using the quark-meson coupling model. We obtain the maximum neutron-star mass of ∼ 2.0M ⊙ , which is consistent with the recently observed, precise mass, 1.97 ± 0.04M ⊙ . The Fock contribution is very important and, in particular, the inclusion of tensor coupling is vital to obtain such large mass. The baryon structure variation in matter also enhances the mass of a neutron star.

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Equation of State for Massive Neutron Stars

Katayama

Miyatsu

Saito

2012

ApJS

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Using relativistic Hartree-Fock approximation, we investigate the properties of the neutron-star matter in detail. In the present calculation, we consider not only the tensor coupling of vector mesons to octet baryons and the form factors at interaction vertexes but also the internal (quark) structure change of baryons in dense matter. The relativistic Hartree-Fock calculations are performed in two ways: one is the calculation with the coupling constants determined by SU(6) (quark model) symmetry, the other is with the coupling constants based on SU(3) (flavor) symmetry. For the latter case, we use the latest Nijmegen (ESC08) model. Then, it is very remarkable that the particle composition of the core matter in SU(3) symmetry is completely different from that in SU(6) symmetry. In SU(6) symmetry, all octet baryons appear in the density region below ∼ 1.2 fm −3 , while, in the ESC08 model, only the Ξ − hyperon is produced. Furthermore, the medium modification of the internal baryon structure hardens the equation of state for the core matter. Taking all these effects into account, we can obtain the maximum neutron-star mass which is consistent with the recently observed mass, 1.97 ± 0.04M ⊙ (PSR J1614-2230). We therefore conclude that the extension from SU(6) symmetry to SU(3) symmetry in the meson-baryon couplings and the internal baryon-structure variation in matter certainly enhance the mass of neutron star. Furthermore, the effects of the form factor at vertex and the Fock contribution including the tensor coupling due to the vector mesons are indispensable to describe the core matter. In particular, the Fock term is very vital in reproducing the preferable value of symmetry energy, a 4 (≃ 30−40 MeV), in nuclear matter.

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The quark-meson coupling model and chiral symmetry

Abstract: Abstract. We extend the quark-meson coupling (QMC) model to incorporate chiral symmetry. The relationship between the QMC model and chiral perturbation theory is also discussed. The nuclear central potential is modified by the effect of internal structure of nucleon.

Cited by 5 publications

References 18 publications

Four-nucleon contact interactions from holographic QCD

Four-nucleon contact interactions from holographic QCD

Effects of Fock term, tensor coupling and baryon structure variation on a neutron star

Equation of State for Massive Neutron Stars

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