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

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

2010-08-05

arxiv.org/abs/1008.0957v1

Astrophysical Journal Letters 724 (2010) L74-L77

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 4 figures

Scientific paper

10.1088/2041-8205/724/1/L74

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.

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