中文摘要：

在中子星物质的 isovector 数量相互作用的存在被交换介子考虑；我们在包含重核子的直接 Urca 过程上学习介子的效果。计算基于相对论的吝啬的领域理论的框架。由我们的分析，直接 Urca 在贝它平衡下面处理的重核子由于介子在更低的密度是开的，它在反应创造在二 baryons 之间的更大的能量差距。介子为直接 Urca 处理的重核子导致中微子放射率的明显的改进。特别地，相对论的中微子放射率比在非相对论的途径预言被发现实质地大介子是否出现在一颗中子星。在我们的结果，介子不仅改变 baryons 性质，而且直接由重核子导致中子星的更多的快速的冷却率 Urca 过程。

英文摘要：

The presence of the isovector scalar interaction in neutron star matter is considered by exchanging δ meson; we study the effects of δ mesons on the direct Urca processes involving hyperons. The calculation is based on the framework of the relativistic mean field theory. By our analysis, the hyperon direct Urca processes under beta equilibrium are open at lower densities due to δ mesons. which create a larger energy gap between two baryons in the reactions. The δ meson leads to all obvious enhancement of the neutrino emissivity for the hyperon direct Urca processes. In particullar, the relativistic neutrino emissivity is found to be substantially larger than predicted in the nonrelativistic approach whether δ mesons appear in an neutron star or not. In our results, δ mesons not only change the baryons properties, but also result in more rapid cooling rate of neutron stars by hyperon direct Urca processes.