Cosmic microwave background observables of small field models of inflation

Ido Ben-Dayan, Ram Brustein

Research output: Contribution to journalArticlepeer-review

64 Scopus citations


We construct a class of single small field models of inflation that can predict, contrary to popular wisdom, an observable gravitational wave signal in the cosmic microwave background anisotropics. The spectral index, its running, the tensor to scalar ratio and the number of e-folds can cover all the parameter space currently allowed by cosmological observations. A unique feature of models in this class is their ability to predict a negative spectral index running in accordance with recent cosmic microwave background observations. We discuss the new class of models from an effective field theory perspective and show that if the dimensionless trilinear coupling is small, as required for consistency, then the observed spectral index running implies a high scale of inflation and hence an observable gravitational wave signal. All the models share a distinct prediction of higher power at smaller scales, making them easy targets for detection.

Original languageEnglish
Article number007
JournalJournal of Cosmology and Astroparticle Physics
Issue number9
StatePublished - 1 Sep 2010


  • Cosmological parameters from CMBR
  • Gravitational waves and CMBR polarization
  • Inflation

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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