Massive neutron stars and Λ-hypernuclei in relativistic mean field models

Sun, Ting-Ting; Xia, Cheng-Jun; Zhang, Shi-Sheng; Smith, M. S.

doi:10.1088/1674-1137/42/2/025101

Title: Massive neutron stars and Λ-hypernuclei in relativistic mean field models

Journal Article · Thu Feb 08 00:00:00 EST 2018 · Chinese Physics C, High Energy Physics and Nuclear Physics

DOI:https://doi.org/10.1088/1674-1137/42/2/025101· OSTI ID:1884048

Sun, Ting-Ting ^[1]; Xia, Cheng-Jun ^[2]; Zhang, Shi-Sheng ^[3];

^[4]

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Natural Science Foundation of China (NSFC); National Key Basic Research Program of China; Physics Research and Development Program of Zhengzhou University

Grant/Contract Number:: AC05-00OR22725; 11525524; 11505157; 11375022; 11705163; 11621131001; 2013CB834400; 32410017

OSTI ID:: 1884048

Journal Information:: Chinese Physics C, High Energy Physics and Nuclear Physics, Vol. 42, Issue 2; ISSN 1674-1137

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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