| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Direct Urca Processes with Hyperons in Cooling Neutron Stars |
| XU Yan1, LIU Guang-Zhou1**, WU Yao-Rui1, ZHU Ming-Feng1, YU Zi2, WANG Hong-Yan1, ZHAO En-Guang3
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1 Center for Theoretical Physics, Jilin University, Changchun 130012
2 College of Science, Nanjing Forestry University, Nanjing 210037
3 Institute 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, WU Yao-Rui et al 2011 Chin. Phys. Lett. 28 079701 |
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Abstract In the relativistic mean field approximation, the relativistic energy losses of the direct Urca processes with nucleons (N-DURCA) and hyperons (Y-DURCA) are studied in the degenerate baryon matter of neutron stars. We investigate the effects of hyperon degrees of freedom and the Y-DURCA processes on the N-DURCA processes, and the total neutrino emissivity of neutron star matter. The results show that the existence of hyperons decreases the abundance of protons and leptons, and can sharply suppress the neutrino emissivity of the N-DURCA processes.
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| Keywords:
97.60.Jd
26.60.Dd
95.30.Cq
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Received: 29 January 2011
Published: 29 June 2011
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