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Effective field theory for neutron stars with strong Σ – ‐hyperon repulsion
Author(s) -
Razeira M.,
Mesquita A.,
Vasconcellos C.A.Z.,
Ruffini R.,
Rueda J.A.,
Gomes R.O.
Publication year - 2014
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201412101
Subject(s) - physics , isoscalar , isovector , neutron star , particle physics , nuclear physics , yukawa potential , nuclear matter , scalar (mathematics) , isospin , effective field theory , meson , hyperon , baryon , nucleon , quantum electrodynamics , quantum mechanics , geometry , mathematics
Abstract We investigate the role of many‐body correlations in the maximum mass of neutron stars using the effective relativistic QHD‐model with parameterized couplings which represents an extended compilation of other effective models found in the literature. Our model exhausts the whole fundamental baryon octet ( n , p , Σ – , Σ 0 , Σ + , Λ, Ξ – , Ξ 0 ) and simulates corrections to the minimal Yukawa couplings by considering many‐body nonlinear self‐couplings and meson‐meson interaction terms involving scalar‐isoscalar (σ, σ * ), vector‐isoscalar ( ω , ϕ ), vector‐isovector ( ρ ) and scalar‐isovector ( δ ). Following recent experimental results, we consider in our calculations the extreme case where the Σ – experiences such a strong repulsion that it does not appear at all in nuclear matter. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)