Inflation in string-inspired cosmology and suppression of CMB low multipoles

Yun Song Piao, Shinji Tsujikawa, Xinmin Zhang

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


We construct a string-inspired nonsingular cosmological scenario in which an inflaton field is driven up the potential before the graceful exit by employing a low-energy string effective action with an orbifold compactification. This sets up an initial condition for the inflaton to lead to a sufficient number of e-foldings and to generate a nearly scale-invariant primordial density perturbation during slow-roll inflation. Our scenario provides an interesting possibility to explain a suppressed power spectrum at low multipoles due to the presence of the modulus-driven phase prior to slow-roll inflation and thus can leave a strong imprint of extra dimensions in observed CMB anisotropies.

Original languageEnglish
Pages (from-to)4455-4461
Number of pages7
JournalClassical and Quantum Gravity
Issue number18
Publication statusPublished - 2004 Sep 21
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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