Massive neutron stars and Λ-hypernuclei in relativistic mean field models
Journal Article
·
· Chinese Physics C, High Energy Physics and Nuclear Physics
- Zhengzhou University (China)
- Zhejiang Univ., Ningbo (China); Chinese Academy of Sciences (CAS), Beijing (China)
- Beihang Univ., Beijing (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Based on relativistic mean field (RMF) models, we study finite Λ-hypernuclei and massive neutron stars. Here, the effective N-N interactions PK1 and TM1 are adopted, while the N-Λ interactions are constrained by reproducing the binding energy of Λ-hyperon at 1s orbit of $${}_{{\rm{\Lambda }}}{}^{40}\mathrm{Ca}$$. It is found that the Λ-meson couplings follow a simple relation, indicating a fixed Λ potential well for symmetric nuclear matter at saturation densities, i.e., around $${V}_{{\rm{\Lambda }}}=-29.786\,\mathrm{MeV}$$. With those interactions, a large mass range of Λ-hypernuclei can be described well. Furthermore, the masses of PSR J1614-2230 and PSR J0348+0432 can be attained adopting the Λ-meson couplings $${g}_{{\rm{\sigma }}{\rm{\Lambda }}}/{g}_{{\rm{\sigma }}N}\gtrsim 0.73$$, $${g}_{{\rm{\omega }}{\rm{\Lambda }}}/{g}_{{\rm{\omega }}N}\gtrsim 0.80$$ for PK1 and $${g}_{{\rm{\sigma }}{\rm{\Lambda }}}/{g}_{{\rm{\sigma }}N}\gtrsim 0.81$$, $${g}_{{\rm{\omega }}{\rm{\Lambda }}}/{g}_{{\rm{\omega }}N}\gtrsim 0.90$$ for TM1, respectively. This resolves the hyperon puzzle without introducing any additional degrees of freedom.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- National Key Basic Research Program of China; National Natural Science Foundation of China (NSFC); Physics Research and Development Program of Zhengzhou University; USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1884048
- Journal Information:
- Chinese Physics C, High Energy Physics and Nuclear Physics, Journal Name: Chinese Physics C, High Energy Physics and Nuclear Physics Journal Issue: 2 Vol. 42; ISSN 1674-1137
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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