Running spectral index from inflation with modulations

Takeshi Kobayashi, Fuminobu Takahashi

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

We argue that a large negative running spectral index, if confirmed, might suggest that there are abundant structures in the inflaton potential, which result in a fairly large (both positive and negative) running of the spectral index at all scales. It is shown that the center value of the running spectral index suggested by the recent CMB data can be easily explained by an inflaton potential with superimposed periodic oscillations. In contrast to cases with constant running, the perturbation spectrum is enhanced at small scales, due to the repeated modulations. We mention that such features at small scales may be seen by 21 cm observations in the future.

Original languageEnglish
Article number026
JournalJournal of Cosmology and Astroparticle Physics
Volume2011
Issue number1
DOIs
Publication statusPublished - 2011 Jan 1
Externally publishedYes

Keywords

  • Cosmological parameters from CMBR
  • Inflation
  • Physics of the early universe
  • Power spectrum

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Fingerprint Dive into the research topics of 'Running spectral index from inflation with modulations'. Together they form a unique fingerprint.

  • Cite this