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Hyperon puzzle and the RMF model with scaled hadron masses and coupling constants

  1. TitleHyperon puzzle and the RMF model with scaled hadron masses and coupling constants
    Author infoE. E. Kolomeitsev, K. A. Maslov, D. N. Voskresensky
    Author Kolomeitsev Evgeni E. 1970- (96%) UMBFP06 - Katedra fyziky
    Co-authors Maslov K. A. (2%)
    Voskresensky Dmitri (2%)
    Source document Journal of Physics: Conference Series. Vol. 668 (2016), pp. 1-6. - Bristol : IOP Publishing, 2016 ; SQM 2015 medzinárodná konferencia
    Keywords stavová rovnica   relativistický model stredného poľa   neutrónové hviezdy   equation of state   relativistic mean-field models   neutron stars  
    LanguageEnglish
    CountryGreat Britian
    systematics 533
    AnnotationThe equation of state of cold baryonic matter is studied within a relativistic mean-field model with hadron masses and coupling constants depending on a scalar field. We demonstrate that if the effective nucleon mass stops to decrease with a density increase at densities n > n > n0, where n0 is the nuclear saturation density, the equation of state stiffens for these densities and the limiting neutron star mass increases. The stabilization of the nucleon mass can be realised if in the equation of motion for the scalar mean-field there appear a term sharply varying in a narrow vicinity of the field value corresponding to the density n . We show several possible realizations of this mechanism getting sufficiently stiff equations of state. The appearance of hyperons in dense neutron star interiors is accounted for. The obtained equations of state remain sufficiently stiff if the reduction of the ϕ meson mass is incorporated. Thereby, the hyperon puzzle can be resolved
    Public work category AFC
    No. of Archival Copy35029
    Catal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Databasexpca - PUBLIKAČNÁ ČINNOSŤ
    ReferencesPERIODIKÁ-Súborný záznam periodika
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