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Neutron stars are giant hypernuclei?
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1985
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Relativistic AstrophysicsNeutron Star PhysicsEngineeringNuclear PhysicsNuclear DataGiant HypernucleiBaryon PopulationsHigh Temperature QcdHigh-energy Nuclear ReactionPhysicsNuclear TheoryNon-perturbative QcdMagnetarNuclear AstrophysicsExperimental Nuclear PhysicsNeutron StarsNatural SciencesStellar StructureParticle PhysicsField Theory
Neutron stars are investigated as potential giant hypernuclei. The study examines neutron stars using a Lagrangian field theory of interacting nucleons, hyperons, and mesons solved in the mean field approximation. The model incorporates constraints on nuclear matter bulk properties—saturation binding energy, density, compressibility, and charge symmetry energy—to calibrate the Lagrangian field theory. The calculations show that heavier neutron star cores are dominated by hyperons, comprising 15–20 % of the baryon population, with the isovector meson strongly influencing baryon composition, lepton populations suppressed, charge neutrality achieved among hadrons, and a potential impact on pulsar magnetic field decay and active lifetime. Published in The Astrophysical Journal (June 1985), DOI 10.1086/163253, by Glendenning N.K.
view Abstract Citations (606) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Neutron stars are giant hypernuclei ? Glendenning, N. K. Abstract Neutron stars are studied in the framework of Lagrangian field theory of interacting nucleons, hyperons, and mesons, which is solved in the mean field approximation. The theory is constrained to account for the four bulk properties of nuclear matter; the saturation binding and density, compressibility, and charge symmetry energy. The cores of the heavier neutron stars are found to be dominated by hyperons, and the total hyperon population for such stars is 15 percent-20 percent, depending on whether pions condense or not. The -meson, which contributes to the isospin symmetry energy, has an important influence on the baryon populations. Lepton populations are strongly suppressed and charge neutrality is achieved among the hadrons. A possible consequence for the decay time of the magnetic field of pulsars and hence for their active lifetime is mentioned. Publication: The Astrophysical Journal Pub Date: June 1985 DOI: 10.1086/163253 Bibcode: 1985ApJ...293..470G Keywords: Hypernuclei; Neutron Stars; Stellar Physics; Chemical Equilibrium; Euler-Lagrange Equation; Field Strength; Field Theory (Physics); Flux Density; Hadrons; Astrophysics full text sources ADS |