Antikaons and hyperons in nuclear matter with saturation

Abstract

We evaluate the antikaon and hyperon spectral functions in a self-consistent and covariant many-body approach. The computation is based on coupled-channel dynamics derived from the chiral SU(3) Lagrangian. A novel subtraction scheme is developed that avoids kinematical singularities and medium-induced power divergencies all together. Scalar and vector mean fields are used to model nuclear binding and saturation. The effect of the latter is striking for the antikaon spectral function that becomes significantly more narrow at small momenta. Attractive mass shifts of about 30 and 40 MeV are predicted for the Lambda(1405) and Sigma(1385) resonances. Once scalar and vector mean fields for the nucleon are switched on the Lambda(1520) resonances dissolves almost completely in nuclear matter. All together only moderate attraction is predicted for the nuclear antikaon systems at saturation density. However, at larger densities we predict a sizable population of soft antikaon modes that arise from the coupling of the antikaon to a highly collective Lambda(1115) nucleon-hole state. This may lead to the formation of exotic nuclear systems with strangeness and antikaon condensation in compact stars at moderate densities.

49 pages, 13 figures, The revised manuscript contains additional material at twice nuclear saturation density. An unexpected and novel mechanism is unravelled that may have dramatic implications on the formation of exotic nuclear systems with strangeness and antikaon condensation in compact stars

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• Level crossing of particle-hole and mesonic modes in eta mesic nuclei
• Anti-strange meson-baryon interaction in hot and dense nuclear matter
• Antikaon interactions with nucleons and nuclei
• $K^{\ast }$ vector meson resonances dynamics in heavy-ion collisions
• Probing the hot and dense nuclear matter with $K^{\ast },{\bar{K}}^{\ast }$ vector mesons
• On kinematical constraints in boson-boson systems
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• Subthreshold and near-threshold kaon and antikaon production in proton-nucleus reactions
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• On kinematical constraints in the hadrogenesis conjecture for the baryon resonance spectrum
• Strange and heavy mesons in hadronic matter
• Dense Hadronic Matter in Neutron Stars
• Medium effects in antikaon-induced ${\Xi }^{-}$ hyperon production on nuclei near threshold
• Pion-induced production of $\Lambda (1520)$ hyperons on nuclei near threshold
• Chiral Partners and their Electromagnetic Radiation -- Ingredients for a systematic in-medium calculation
• Strange meson production at high density and temperature
• Strangeness and charm at FAIR
• Selfconsistent descriptions of vector-mesons in hot matter revisited
• Strange mesons from SIS to FAIR
• Strange mesons in nuclei and neutron stars
• Strangeness and Charm in Nuclear Matter
• Heavy Mesons in Nuclear Matter and Nuclei