Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS
Volume 24, Issue 12, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218301315501001
Keywords
Hyperons; neutron stars; nuclear matter
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Funding
- Rare Isotope Science Project of Institute for Basic Science - Ministry of Science, ICT and Future Planning
- National Research Foundation of Korea (NRF) [2013M7A1A1075764]
- Basic Science Research Program through the NRF - Ministry of Education [NRF-2014R1A1A2054096]
- Basic Science Research Program through the NRF - Ministry of Science, ICT and Future Planning [NRF-2014M1A7A1A03029872]
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2015R1A2A2A01004238]
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We consider the so-called hyperon puzzle of neutron star (NS). We employ Skyrme force models for the description of in-medium nucleon-nucleon (NN), nucleon-Lambda hyperon (N Lambda) and Lambda-Lambda (Lambda Lambda) interactions. A phenomenological finite-range force (FRF) for the Lambda Lambda interaction is considered as well. Equation of state (EoS) of NS matter is obtained in the framework of density functional theory, and Tolman-Oppenheimer-Volkoff (TOV) equations are solved to obtain the mass-radius relations of NSs. It has been generally known that the existence of hyperons in the NS matter is not well supported by the recent discovery of large-mass NSs (M similar or equal to 2 M-circle dot) since hyperons make the EoS softer than the one without them. For the selected interaction models, N Lambda interactions reduce the maximum mass of NS by about 30%, while Lambda Lambda interactions can give about 10% enhancement. Consequently, we find that some Skyrme force models predict the maximum mass of NS consistent with the observation of 2 M-circle dot NSs, and at the same time satisfy observationally constrained mass-radius relations.
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