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Cooling of Hyperonic Neutron Stars with Antikaons |
| DING Wen-Bo1**, YU Zi2, LIU Yu-Hui1
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1 School of Mathematics and Physics, Bohai University, Jinzhou 121000
2 College of Science, Nanjing Forestry University, Nanjing 210037
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| Cite this article: |
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DING Wen-Bo, YU Zi, LIU Yu-Hui 2011 Chin. Phys. Lett. 28 072601 |
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Abstract We discuss the impact of hyperons on the neutrino emitting and the gross cooling features of neutron stars with K− and K0 condensations. The results show that hyperons change the density ranges of the direct Urca process with nucleons and the Urca processes of K− and K0 condensations, as well as the values of neutrino emissivity. Moreover, interactions between hyperons and antikaons make the neutrino luminosity complicated. It is found that various hyperons play different roles in neutron stars. For massive stars, Σ hyperons make the cooling slower. However, Λ can hardly change the cooling history but it reduces the mass of neutron stars.
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| Keywords:
26.60.+c
21.65.+f
97.60.Jd
95.30.Cq
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Received: 22 February 2011
Published: 29 June 2011
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