文献类型：期刊文献

英文题名：Can quintessence be the rolling tachyon?

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 Univ Sci & Technol, Inst Theoret Phys, Shanghai 200237, Peoples R China

年份：2002

卷号：19

期号：11

起止页码：1584

外文期刊名：CHINESE PHYSICS LETTERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000179433200005)】；

语种：英文

摘要：In the light of the recent works by Sen (hep-th/0203211, hep-th/0203265, hep-th/0204143) and Gibbons (hep-th/0204008), we present a phase-plane analysis on the cosmology containing a rolling tachyon field in a potential resulting from string theory. We show that there is no stable point on the phase-plane, which indicates that there is a coincidence problem if we consider the tachyon as a candidate for quintessence. Furthermore, we also analyse the phase-plane of the cosmology containing a rolling tachyan field for an exactly solvable toy potential in which the critical point is stable. Therefore, it is possible for the rolling tachyon to be a candidate for quintessence if we give up the strict constraint on the potential or find a more appropriate effective potential for the tachyon from M/string theory.