文献类型：期刊文献

英文题名：THE SOLUTIONS OF THE COSMIC-STRING LOOP EQUATION IN AN EXPANDING UNIVERSE

作者：LI, XZ; ZHANG, JZ

机构：[1]E CHINA INST THEORET PHYS,SHANGHAI 200237,PEOPLES R CHINA

年份：1993

卷号：312

期号：1-2

起止页码：62

外文期刊名：PHYSICS LETTERS B

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1993LR03300013)】；

语种：英文

摘要：The cosmic string loop equation is studied analytically during the radiation-dominated era in the Robertson-Walker universe. If the loops expand with the Hubble flow at the time of formation of the loops, the cosmic string loops occur always collapsing. We also discuss the initial radii R(s)(t*) dependence of the lifetime tau(s) without considering oscillations, as a first approximation, where t* denotes the time of the formation of the loops. We find that the lifetime factor gamma=ctau(s)/R(s)(t*) is tau/2 in the limit of small initial radius.