1997/12/05 by G. E. Brown, G.E. Brown, C.-H. Lee +2 · 14 citations
Physics and Astronomy · #Degrees of freedom (physics and chemistry) #Excitation #High-Energy Particle Collisions Research #Hyperon #Mean field theory #Pulsars and Gravitational Waves Research #Quantum Chromodynamics and Particle Interactions #Quark #Scalar (mathematics) #Strangeness #Subthreshold conduction #nucl-th
paper · pdf · doi:10.1016/s0375-9474(98)00312-1
published in Nuclear Physics A 639(1-2), 455c-464c (Elsevier BV) · 10 pages, 8 postscript figures, Talk given at the International Conference on Hypernuclear and Strange Particle Physics (HYP97), Brookhaven Nat'l Lab., USA, October 13-18, 1997, to be published in Nucl. Phys. A
arxiv created 1997/12/05 · openalex publication_date 1998/08/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We discuss the role of strangeness in dense matter and especially in neutron stars. The early (in density) introduction of hyperons found in many calculations is probably delayed by the decrease in vector mean field acting on the neutron. The decrease results from both conventional many-body rescattering effects and from the movement towards asymptotic freedom at high densities. Subthreshold K--meson production by the KaoS collaboration at GSI shows that the K--mass must be substantially lowered, by \gtrsim 200 MeV at ρ∼ 2ρ0. It is shown that explicit chiral symmetry breaking through the kaon mass may be responsible for Σ--nucleon and Ξ--nucleon scalar attraction being weaker than obtained by simple quark scaling. The normal mode of the strangeness minus, charge e-, excitation is constructed as a linear combination of K--meson and Σ-, neutron-hole state. Except for zero momentum, where the terms are unmixed the "kaesobar" is a linear combination of these two components.