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

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.

preprint2010arXivOpen access
Torsten SchürhoffStefan SchrammVeronica Dexheimer
astro-ph.HEnucl-thastro-ph.SR
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Torsten SchürhoffStefan SchrammVeronica Dexheimer

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