| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Influence of σ* and φ Mesons on Λ Hyperon 1S0 Superfluidity in Neutron Star Matter |
| XU Yan1**,LIU Guang-Zhou2,WANG Hong-Yan2,DING Wen-Bo3,ZHAO En-Guang4 |
1Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Changchun 130117
2Center for Theoretical Physics, Jilin University, Changchun 130012
3Department of Physics, Bohai University, Jinzhou 121000
4Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 |
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| Cite this article: |
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XU Yan, LIU Guang-Zhou, WANG Hong-Yan et al 2012 Chin. Phys. Lett. 29 059701 |
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Abstract Within the framework of the relativistic mean field theory, we investigate the 1S0 superfluidity (SF) of Λ hyperons in neutron star (NS) matter including σ* and φ mesons. The energy gap of Λ hyperons is calculated with the Nijmegen one−boson-exchange potentials for a ΛΛ pair. The parameter set we use is in line with the recent experimental data ΔBΛΛ∼1.01±0.20+0.18−0.11 MeV. It is found that with σ* and φ mesons the pairing energy gap ΔF of Λ hyperons and the corresponding SF critical temperature TCΛ are suppressed. In addition the NS mass range of Λ hyperon SF is enlarged obviously.
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Received: 06 December 2011
Published: 30 April 2012
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