1,392 research outputs found
Flavour asymmetry of anti-quarks in nuclei
A novel nuclear effect on the flavour asymmetry of anti-quarks in the nucleon
bound in a nucleus is discussed in terms of the meson cloud model and the Pauli
exclusion principle. It is expected that the flavour asymmetry is enhanced in a
nucleus.Comment: 3 pages, Euro. Phys. J. A in pres
The quark-meson coupling model and chiral symmetry
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.Comment: 6 pages, 1 figure, Contribution to the proceedings of "Achievements
and New Directions in Subatomic Physics: Workshop in Honour of Tony Thomas'
60th Birthday," Special Centre for the Subatomic Structure of Matter,
Adelaide, South Australia, February 15 - February 19, 2010
Relationship between Quark-Meson Coupling Model and Quantum Hadrodynamics
Using the quark-meson coupling (QMC) model, we study nuclear matter from the
point of view of quark degrees of freedom. Performing a re-definition of the
scalar field in matter, we transform QMC to a QHD-type model with a non-linear
scalar potential. The potentials obtained from QMC are compared with those of
the relativistic mean-field models.Comment: 6 pages, including 2 figs., to be published in Prog. Theor. Phys.
(Kyoto) vol.108, no.
Quark-meson coupling model with short-range quark-quark interactions
Short-range quark-quark correlations are introduced into the quark-meson
coupling (QMC) model phenomenologically. We study the effect of the
correlations on the structure of the nucleon in dense nuclear matter. With the
addition of correlations, the saturation curve for symmetric nuclear matter is
much improved at high density.Comment: 6 pages (including 4 figures), to be published in Prog. Theor. Phys.
(Kyoto) vol.105, no.2 (2001
Hyperons in neutron stars
Using the Dirac-Brueckner-Hartree-Fock approach, the properties of
neutron-star matter including hyperons are investigated. In the calculation, we
consider both time and space components of the vector self-energies of baryons
as well as the scalar ones. Furthermore, the effect of negative-energy states
of baryons is partly taken into account. We obtain the maximum neutron-star
mass of , which is consistent with the recently observed,
massive neutron stars. We discuss a universal, repulsive three-body force for
hyperons in matter.Comment: 13 pages, 3 figures, 2 tables. arXiv admin note: text overlap with
arXiv:1410.716
Equation of State for Neutron Stars in the Quark-Meson Coupling Model with the Cloudy Bag
Using the quark-meson coupling model with the cloudy bag, we construct the
equation of state for neutron stars with hyperons in SU(3) flavor symmetry. The
hyperfine interaction due to the gluon exchange and the pion-cloud effect
inside a baryon is taken into account in vacuum and nuclear matter. We
investigate how the quark degrees of freedom and the exchanges of gluon and
pion between two quarks affect the properties of nuclear and neutron-star
matter. It is found that the variation of baryon substructure in matter plays
an important role in supporting massive neutron stars.Comment: 4 papes, 3 figures, 2 tables, accepted to the proceedings of the 8th
International Conference on Quarks and Nuclear Physics (QNP2018) in JPS
Conference Proceeding
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