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Can Quintessence Be the Rolling Tachyon? |
| LI Xin-Zhou;HAO Jian-Gang;LIU Dao-Jun |
| Shanghai United Center for Astrophysics, Shanghai Normal University, Shanghai 200234
Institute for Theoretical Physics, East China University of Science and Technology, Shanghai 200237 |
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| Cite this article: |
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LI Xin-Zhou, HAO Jian-Gang, LIU Dao-Jun 2002 Chin. Phys. Lett. 19 1584-1586 |
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Abstract 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 resulted from string theory. We show that there is no stable point on the phase-plane, which indicates that there is a coincidence problem if one consider tachyon as a candidate for quintessence. Furthermore, we also analyse the phase-plane of the cosmology containing a rolling tachyon field for an exactly solvable toy
potential in which the critical point is stable. Therefore, it is possible for rolling tachyon to be quintessence if one gives up the strict constraint on the potential or find a more appropriate effective potential for the tachyon from M/string theory.
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| Keywords:
04.40.-b
98.80.Cq
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Published: 01 November 2002
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| PACS: |
04.40.-b
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(Self-gravitating systems; continuous media and classical fields in curved spacetime)
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98.80.Cq
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(Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.))
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