Effective field theory for neutron stars with strong Σ--hyperon repulsion
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-, Σ0, Σ+, Λ, Ξ-, Ξ0) 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 (ǎrrho) 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.
- Publication:
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Astronomische Nachrichten
- Pub Date:
- September 2014
- DOI:
- 10.1002/asna.201412101
- Bibcode:
- 2014AN....335..733R
- Keywords:
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- Neutron Stars;
- Many-Body Forces;
- Effective Theory