تقرير
Neutron stars with Hyperons in Dirac-Brueckner-Hartree-Fock approach
| العنوان: | Neutron stars with Hyperons in Dirac-Brueckner-Hartree-Fock approach |
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| المؤلفون: | Katayama, Tetsuya, Saito, Koichi |
| سنة النشر: | 2014 |
| المجموعة: | Astrophysics High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Theory, Astrophysics - Solar and Stellar Astrophysics, High Energy Physics - Phenomenology, Nuclear Experiment |
| الوصف: | Using the Dirac-Brueckner-Hartree-Fock (DBHF) approach including the hyperon degrees of freedom, we investigate the properties of neutron-star matter. To handle the hyperons in matter, we first examine the importance of the space part of baryon self-energies at high densities, and secondly study the effect of negative-energy states of baryons, which can provide an unambiguous relationship between the in-medium reaction matrices for baryon-baryon scattering and the baryon self-energies. We solve the coupled, Bethe-Salpeter equations in the nuclear-matter rest frame by using the Bonn potentials. We assume that eight kinds of nonstrange and strange mesons ($\sigma,\,\delta,\,\omega,\,\rho,\,\eta,\,\pi,\,K,\,K^{\ast}$) take part in the interactions between two baryons. Then, we calculate the baryon self-energies, the energy density and pressure of matter. The present calculation provides a hard equation of state in neutron-star matter at high densities, which is generated by the effect of Pauli exclusion, the short-range correlations between two baryons, etc. We finally predict the maximum neutron-star mass of $2.02\,M_{\odot}$, which is consistent with both the recently observed masses, $1.97\pm0.04M_{\odot}$ (J1614-2230) and $2.01\pm0.04M_{\odot}$ (J0348+0432). Comment: 27 pages, 11 figures, 3 tables |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1410.7166 |
| رقم الأكسشن: | edsarx.1410.7166 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |