Kaons and pions in strange quark matter
Abstract
Description
The behavior of kaons and pions in strange quark matter in weak equilibrium, is investigated within the SU(3) Nambu-Jona-Lasinio [NJL] model. This work focuses a region of high densities where the behavior of mesons has not been explored in the framework of this model. It is found that above the density where strange valence quarks appear in the medium, $ρ= 3.8 ρ_0$, a change of behavior of different observables is observed indicating a tendency to the restoration of flavor symmetry. In particular, the splitting between charge multiplets, $K^+, K^-; K^0, {\bar K^0} {and} π^+, π^-$ decrease and the low energy modes with quantum numbers of $K^-, \bar K^0 {and} π^+$, which are excitations of the Fermi sea, are less relevant than for lower densities.
10 pages, 3 figures included; revised version, some changes in the discussion
10 pages, 3 figures included; revised version, some changes in the discussion