文献类型：期刊文献

英文题名：Quintessence with O(N) symmetry

作者：Li, XZ; Hao, JG; Liu, DJ

机构：[1]Shanghai Normal Univ, Shanghai United Ctr Astrophys, Shanghai 200234, Peoples R China;[2]E China Inst Theoret Phys, Shanghai 200237, Peoples R China

年份：2002

卷号：19

期号：23

起止页码：6049

外文期刊名：CLASSICAL AND QUANTUM GRAVITY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000180197300013)】；

语种：英文

摘要：We study a new class of quintessence models, in which the scalar field possesses an O(N) internal symmetry. We give a critical condition of instability for the potential against Q ball formation.. We find that the most widely used potentials of quintessence do not satisfy the above condition, and therefore, the O(N) quintessence with these potentials will not lead to Q ball formation. It is worth noting that the O(N) quintessence with a cosine-type potential is especially interesting in that the angular contribution is not negligible.