Plasma neutrino energy loss due to the axial-vector current at the late stages of stellar evolution
Based on the Weinberg-Salam theory, the plasma neutrino energy loss rates of vector and axialvector contributions are studied.A ratable factor of the rates from the axial-vector current relative to those of the total neutrino energy loss rates is accurately calculated.The results show that the ratable factor will reach a maximum of 0.95 or even more at relatively higher temperature and lower density (such as P/μe＜ 10~7 g/cm~3).Thus the rates of the axial-vector contribution cannot be neglected.On the other hand, the rates of the axialvector contribution are on the order of～0.01% of the total vector contribution, which is in good agreement with Itoh's at relatively high density (such as p/μe＞10~7 g/cm~3) and a temperature of T≤10~(11) K.
作 者： LIU Jing-Jing 作者单位： Department of Physics,Qiongzhou University,Wuzhishan 572200,China 刊 名： 中国物理C(英文版) ISTIC 英文刊名： CHINESE PHYSICS C 年，卷(期)： 2009 33(10) 分类号： O4 关键词： Weinberg-Salam theory plasma neutrino energy loss stellar evolution