Can Quintessence Be The Rolling Tachyon?

Details Can Quintessence Be The Rolling Tachyon? Can Quintessence Be The Rolling Tachyon?

2002-04-30

arxiv.org/abs/hep-th/0204252v2

Chin.Phys.Lett. 19 (2002) 1584

Physics

High Energy Physics

High Energy Physics - Theory

typos corrected, references added and a brief discussion concerning the recent progress added to the introduction

Scientific paper

10.1088/0256-307X/19/11/305

In light of the recent work by Sen and Gibbons, 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 indicated that there is a coincidence problem if one consider tachyon as a candidate of quintessence. Furthermore, we also analyze 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 give 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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