Neutron stars with small radii -- the role of delta resonances

Abstract

Recent neutron star observations suggest that the masses and radii of neutron stars may be smaller than previously considered, which would disfavor a purely nucleonic equation of state. In our model, we use a the flavor SU(3) sigma model that includes delta resonances and hyperons in the equation of state. We find that if the coupling of the delta resonances to the vector mesons is slightly smaller than that of the nucleons, we can reproduce both the measured mass-radius relationship and the extrapolated equation of state.

4 pages, 4 figures

References in corpus (4)

• Neutron Star Observations: Prognosis for Equation of State Constraints
• Nuclear Matter and Neutron stars in a Parity Doublet Model
• Phase Structure in a Hadronic Chiral Model
• Isospin asymmetric nuclear matter and properties of axisymmetric neutron stars

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