2004/04/30 by Chanju Kim, Hang Bae Kim, Yoonbai Kim +2
Physics and Astronomy · #hep-th
published as J.Korean Phys.Soc. 45 (2004) S181-S202 · LaTex, 11 pages, 2 figures
arxiv created 2005/01/05 · arxiv updated 2009/12/01
Cosmological implication of rolling tachyons is reported in the context of effective field theory. With a brief review of rolling tachyons in both flat and curved spacetimes, we study the string cosmological model with both tachyon and dilaton. In the string frame, flat space solutions of both initial-stage and late-time are obtained in closed form. In the Einstein frame, every expanding solution is decelerating. When a Born-Infeld U(1) gauge field is coupled, enhancement of e-folding of scale factor is also discussed by numerical analysis.