Effects of the δ meson on the direct Urca processes in neutron stars |
| |
引用本文: | 喻孜,丁文波.Effects of the δ meson on the direct Urca processes in neutron stars[J].中国物理 C,2011,35(9):812-816. |
| |
作者姓名: | 喻孜 丁文波 |
| |
作者单位: | 1. College of Science, Nanjing Forestry University, Nanjing 210037, China;;2. Physics Department of Bohai University, Jinzhou 121000, China |
| |
基金项目: | Supported by National Natural Science Foundation of China (10675024,11075063); Natural Science Fundamental Research Project of Jiangsu Colleges and Universities (10KJB140002) |
| |
摘 要: | In the framework of the relativistic mean field theory, the effects of the δ meson on the direct Urca (DURCA) processes are investigated. In a neutron star, the DURCA processes involving nucleons, Λ and Ξ- can take place while the process involving the Ξ0 can not. With the inclusion of the δ meson, the threshold densities for the DURCA processes become lower. With the δ included, the threshold neutron star mass for the DURCA process among nucleons and electrons becomes smaller while the threshold masses for the processes involving hyperons become larger. When the δ meson is included, the total neutrino emissivity remarkably increases in the density range of 0.32--0.41 fm-3. The total neutrino luminosity increases with the neutron star mass first and then decreases. The neutrino luminosity gets larger with the inclusion of the δ meson. The cooling of the EXO0748-676 is sensitive to the isovector scalar interaction.
|
关 键 词: | 中子星 介子 相对论平均场理论 密度范围 中微子 子进程 门槛 发射率 |
收稿时间: | 2010-11-8 |
修稿时间: | 2010-12-30 |
本文献已被 CNKI 维普 等数据库收录! |
| 点击此处可从《中国物理 C》浏览原始摘要信息 |
| 点击此处可从《中国物理 C》下载免费的PDF全文 |
|