Hyperons and massive neutron stars: Vector repulsion and SU(3) symmetry
By S. Weissenborn, D. Chatterjee, J. Schaffner-Bielich. 2011
223 citations recorded by the source corpus.
With the discovery of massive neutron stars such as PSR J1614-2230, the question has arisen of whether exotic matter such as hyperons can exist in the neutron star core. We examine the conditions under which hyperons can exist in massive neutron stars. We consistently investigate the vector baryon-meson coupling, going from the SU(6) quark model to a broader SU(3) symmetry. We propose that the maximum neutron star mass decreases linearly with the strangeness content ${f}_{s}$ of the neutron star core as ${M}_{\text{max}}({f}_{s})={M}_{\text{max}}(0)\ensuremath{-}0.6{M}_{\ensuremath{\bigodot}}({f}_{s}/0.1)$, which seems to be independent of the underlying nuclear equation of state and the vector baryon-meson coupling scheme. Thus, pulsar mass measurements can be used to constrain the hyperon fraction in neutron stars.
Subfields: Astronomy and Astrophysics, Geophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/49c48902fa78c560dc8a8a401e2f9a0c67a055b5
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Citations in the corpus
- Strangeness in nuclei and neutron stars (2020, methodology): “One possible way of solving the hyperon puzzle lies in the use of stiff Y N and Y Y interactions (see [363, 380–382] for some examples), so as to overcome the softening induced by the presence of hyperons, thus reaching 2M .”
- Antinuclei in heavy-ion collisions (2018, background): “Possible solutions include deconfinement to quark matter, or alternative Y N and Y Y couplings [212, 213, 214, 215, 216, 217, 218, 219].”
- Maximum mass of neutron stars and strange neutron-star cores (2012, background): “Hyperon repulsion due to an exchange of vector φ mesons allows for Mmax > 2.0 M , without spoiling the agreement with nuclear and hyper-nuclear data (Bednarek et al. 2012; Weissenborn et al. 2012a,b; Łastowiecki et al. 2012).”
- Hyperons in neutron star matter within relativistic mean-field models (2014, background): “41 are signiˇcantly lower than those in [3], i.”