Implications of the fermion vacuum term in the extended SU(3) Quark Meson model on compact stars properties
| Autor: | Jürgen Schaffner-Bielich, Andreas Zacchi |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Quark High Energy Astrophysical Phenomena (astro-ph.HE) Equation of state Particle physics Solar mass Meson Nuclear Theory 010308 nuclear & particles physics FOS: Physical sciences Fermion Compact star 01 natural sciences Nuclear Theory (nucl-th) Stars High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Mean field theory 0103 physical sciences Astrophysics::Earth and Planetary Astrophysics 010306 general physics Astrophysics - High Energy Astrophysical Phenomena |
| DOI: | 10.48550/arxiv.1909.12071 |
| Popis: | We study the impact of the fermion vacuum term in the SU(3) quark meson model on the equation of state and determine the vacuum parameters for various sigma meson masses. We examine its influence on the equation of state and on the resulting mass radius relations for compact stars. The tidal deformability $\Lambda$ of the stars is studied and compared to the results of the mean field approximation. Parameter sets which fulfill the tidal deformability bounds of GW170817 together with the observed two solar mass limit turn out to be restricted to a quite small parameter range in the mean field approximation. The extended version of the model does not yield solutions fulfilling both constraints. Furthermore, no first order chiral phase transition is found in the extended version of the model, not allowing for the twin star solutions found in the mean field approximation. Comment: 12 pages, 8 figures |
| Databáze: | OpenAIRE |
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