文献类型：期刊文献

中文题名：Circular Loop Equation of a Cosmic String in Gauss-Bonnet-de Sitter Spacetimes

英文题名：Circular loop equation of a cosmic string in Gauss-Bonnet-de Sitter spacetimes

作者：Cheng Hong-Bo[1];Liu Yun-Qi[1]

机构：[1]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2008

卷号：25

期号：3

起止页码：1160

中文期刊名：Chinese Physics Letters

外文期刊名：CHINESE PHYSICS LETTERS

收录：CSTPCD;;EI(收录号：20220711661895);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000254124700096)】；CSCD:【CSCD2011_2012】；

基金：Supported by the National Natural Science Foundation of China under Grant No 10333020, and the Shanghai Municipal Science and Technology Commission under Grant No 04dz05905.

语种：英文

中文关键词：BLACK-HOLES

外文关键词：Cosmology - Stars - Equations of motion - Gaussian distribution - Gravitation

摘要：We perform the analysis of evolution of cosmic string loops in the background of Gauss-Bonnet-de Sitter. The equation of motion of cosmic string loops in this spacetime is derived. Having solved the equation numerically, we investigate the dependence of the loop evolution on the values of a, related to the Gauss-Bonnet coupling. In the Gauss-Bonnet-de Sitter spacetimes with different dimensionality there exists a special parameter αm. In the environment with α 〉 αm, all the cosmic string loops will collapse to form black holes. Within the region 0 〈 α 〈 αm, the stronger Gauss-Bonnet effect will lead more cosmic string loops, including smaller ones, to form black holes. The larger the value of a is, the smaller the special values that exist, and only the cosmic string loops with initial radius larger than the special values can expand and evolve instead of becoming black holes.
We perform the analysis of evolution of cosmic string loops in the background of Gauss-Bonnet-de Sitter. The equation of motion of cosmic string loops in this spacetime is derived. Having solved the equation numerically, we investigate the dependence of the loop evolution on the values of alpha, related to the Gauss Bonnet coupling. In the Gauss-Bonnet-de Sitter spacetimes with different dimensionality there exists a special parameter alpha(m). In the environment with alpha > alpha(m), all the cosmic string loops will collapse to form black holes. Within the region 0 < alpha < alpha(m), the stronger Gauss-Bonnet effect will lead more cosmic string loops, including smaller ones, to form black holes. The larger the value of alpha is, the smaller the special values that exist, and only the cosmic string loops with initial radius larger than the special values can expand and evolve instead of becoming black holes.