S-duality in string gas cosmology

Savas Arapoglu, Ata Karakci, Ali Kaya*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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 languageEnglish
Pages (from-to)255-260
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number2-3
Publication statusPublished - 8 Feb 2007
Externally publishedYes


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

FundersFunder number
Türkiye Bilimler Akademisi


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