1,513 research outputs found
Nuclear pasta structures and the charge screening effect
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.Comment: 11 pages, 9 figures, submitted to PR
Kaon Condensation and the Non-Uniform Nuclear Matter
Non-uniform structures of nuclear matter are studied in a wide density-range.
Using the density functional theory with a relativistic mean-field model, we
examine non-uniform structures at sub-nuclear densities (nuclear ``pastas'')
and at high densities, where kaon condensate is expected. We try to give a
unified view about the change of the matter structure as density increases,
carefully taking into account the Coulomb screening effects from the viewpoint
of first-order phase transition.Comment: Presented at "Tours Symposium on Nuclear Physics V
Finite size effects on kaonic pasta structures
Non-uniform structures of mixed phases at the first-order phase transition to
charged kaon condensation are studied using a density functional theory within
the relativistic mean field model. Including electric field effects and
applying the Gibbs conditions in a proper way, we numerically determine density
profiles of nucleons, electrons and condensed kaons. Importance of charge
screening effects is elucidated and thereby we show that the Maxwell
construction is effectively justified. Surface effect is also studied to figure
out its effect on the density profiles
Finite-size effects at the hadron-quark transition and heavy hybrid stars
We study the role of finite-size effects at the hadron-quark phase transition
in a new hybrid equation of state constructed from an ab-initio
Br\"uckner-Hartree-Fock equation of state with the realistic Bonn-B potential
for the hadronic phase and a covariant non-local Nambu--Jona-Lasinio model for
the quark phase. We construct static hybrid star sequences and find that our
model can support stable hybrid stars with an onset of quark matter below and a maximum mass above in agreement with recent
observations. If the finite-size effects are taken into account the core is
composed of pure quark matter. Provided that the quark vector channel
interaction is small, and the finite size effects are taken into account, quark
matter appears at densities 2-3 times the nuclear saturation density. In that
case the proton fraction in the hadronic phase remains below the value required
by the onset of the direct URCA process, so that the early onset of quark
matter shall affect on the rapid cooling of the star.Comment: version to match the one published in PR
Coulomb screening effect on the nuclear-pasta structure
Using the density functional theory (DFT) with the relativistic mean field
(RMF) model, we study the non-uniform state of nuclear matter, ``nuclear
pasta''. We self-consistently include the Coulomb interaction together with
other interactions. It is found that the Coulomb screening effect is
significant for each pasta structure but not for the bulk equation of state
(EOS) of the nuclear pasta phase
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