Motivated by recent works of Sen hep-th/0203211, hep-th/0203265 and Gibbons hep-th/0204008, we study the evolution of a flat and homogeneous universe dominated by tachyon matter. In particular, we analyze the necessary conditions for inflation in the early roll of a single tachyon field. Comparison with string theory reveals that the potential is too steep to explain the fluctuations in the CMBR. We suggest a scenario based on the simultaneous decay of many branes and comment on the issue of reheating of the universe after tachyon rolling. (C) 2002 Elsevier Science B.V. All rights reserved. References: 37
展开▼
