119028598
Half-Skyrmions, Tensor Forces and Symmetry Energy in Cold Dense Matter
In a previous article, the 4D half-skyrmion (or 5D dyonic salt) structure of dense baryonic matter described in crystalline configuration in the large Nc limit was shown to have nontrivial consequences on how anti-kaons behave in compressed nuclear matter with a possible implication on an “ice-9” phenomenon of deeply bound kaonic matter and condensed kaons in compact stars. We extend the analysis to make a further prediction on the scaling properties of hadrons that have a surprising effect on the nuclear tensor forces, the symmetry energy and hence on the phase structure at high density. We treat this problem relying on certain topological structure of chiral solitons. Combined with what can be deduced from hidden local symmetry for hadrons in dense medium and the “soft” dilatonic degree of freedom associated with the trace anomaly of QCD, we uncover a novel structure of chiral symmetry in the “supersoft” symmetry energy that can influence the structure of neutron stars. .
14302817
Vector mesons and dense skyrmion matter
Abstract In our continuing effort to understand hadronic matter at high density, we have developed a unified field theoretic formalism for dense skyrmion matter using a single Lagrangian to describe simultaneously both matter and meson fluctuations and studied in-medium properties of hadrons. Dropping the quartic Skyrme term, we incorporate into our previous Lagrangian the vector mesons ρ and ω in a form which is consistent with the symmetries of QCD. The results that we have obtained, reported here, expose a hitherto unsuspected puzzle associated with the role the ω meson plays at short distance. Since the ω meson couples to baryon density, it leads to a pseudo-gap scenario for the chiral symmetry phase transition, which is at variance with standard scenario of QCD at the phase transition. We find that in the presence of the ω mesons, the scale-anomaly dilaton field is prevented from developing a vanishing vacuum expectation value at the chiral restoration, as a consequence of which the in-medium pion decay constant does not vanish. This seems to indicate that the ω degree of freedom obstructs the “vector manifestation” which is considered to be a generic feature of effective field theories matched to QCD.
120786968
Casimir energy of the Skyrmion due to kaon vacuum fluctuations
119359306
Neutral pion decay in dense Skyrmion matter
We study the density dependence of the decay {pi}{sup 0}{yields}{gamma}{gamma} using the Skyrme Lagrangian to describe simultaneously both the matter background and mesonic fluctuations. The classical ground state configuration has different chiral properties depending on the Skyrmion density, which is reflected in the physical properties of pion fluctuating on top of the classical background. This leads to large suppression at high density of both photo-production from the neutral pion and the reverse process. The effective charges of {pi}{sup {+-}} are also discussed in the same framework.
15479695
Excited states of heavy baryons in the Skyrme model.
We obtain the spectra of excited heavy baryons containing one heavy quark by quantizing the exactly solved heavy meson bound states to the Skyrme soliton. The results are comparable to the recent experimental observations and quark model predictions, and are consistent with heavy quark spin symmetry. However, the somewhat large dependence of the results on the heavy quark mass strongly calls for the incorporation of the soliton-recoil effects. {copyright} {ital 1996 The American Physical Society.}
120803195
Skyrmion and Dense Matter
Skyrme model can provide valuable insights (though qualitative) on high density physics of mesons and baryons in a unified way. First, the dense hadronic matter can be described by the soliton configuration of given meson Lagrangian, which undergoes an interesting chiral phase transition as the baryon density increases. Then, by incorporating the meson fluctuations on top of such ground state we can investigate the in-medium properties of mesons.
181523075
Measurements of pion nucleon charge exchange near the Delta resonance using the NMS at LAMPF