Rolling tachyons in string cosmology

Chanju Kim, Hang Bae Kim, Yoonbai Kim

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64 Scopus citations


We study the role of rolling tachyons in the cosmological model with dilatonic gravity. In the string frame, flat space solutions of both initial-stage and late-time are obtained in closed form. In the Einstein frame, we show that every expanding solution is decelerating.

Original languageEnglish
Pages (from-to)111-118
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - 23 Jan 2003

Bibliographical note

Funding Information:
We would like to thank Nakwoo Kim and Jung Tay Yee for discussions on D-brane systems. H.B. Kim and Y. Kim would like to acknowledge the hospitality of Korea Institute for Advanced Study where a part of this work has been done. This work was supported by Korea Research Foundation Grant KRF-2002-070-C00025 (C.K.) and the Swiss Science Foundation, grant 21-58947.99 (H.B.K.), and is the result of research activities (Astrophysical Research Center for the Structure and Evolution of the Cosmos (ARCSEC) and the Basic Research Program, R01-2000-000-00021-0) supported by Korea Science Engineering Foundation (Y.K.).


  • Dilaton
  • Rolling tachyon
  • String cosmology


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