## Abstract

We consider a toy cosmological model in string theory involving the winding and momentum modes of (m, n) strings, i.e. bound states of m fundamental and n D-strings. The model is invariant under S-duality provided that m and n are interchanged. The dilaton is naturally stabilized due to S-duality invariance, which offers a new mechanism of moduli fixing in string gas cosmology. Using a tachyon field rolling down to its ground state, we also point out a possible way of realizing a cosmological phase with decreasing Hubble radius and constant dilaton.

Original language | English |
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Pages (from-to) | 255-260 |

Number of pages | 6 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 645 |

Issue number | 2-3 |

DOIs | |

Publication status | Published - 8 Feb 2007 |

Externally published | Yes |

### Funding

The work of Ali Kaya is partially supported by Turkish Academy of Sciences via Young Investigator Award Program (TÜBA-GEBİP).

Funders | Funder number |
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Türkiye Bilimler Akademisi |