Running of scalar spectral index in multi-field inflation

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We compute the running of the scalar spectral index in general multi-field slow-roll inflation. By incorporating explicit momentum dependence at the moment of horizon crossing, we can find the running straightforwardly. At the same time, we can distinguish the contributions from the quasi de Sitter background and the super-horizon evolution of the field fluctuations.

Original languageEnglish
Article number041
JournalJournal of Cosmology and Astroparticle Physics
Issue number5
StatePublished - 26 May 2015

Bibliographical note

Publisher Copyright:
© 2015 IOP Publishing Ltd and Sissa Medialab srl.


  • cosmological perturbation theory
  • inflation
  • physics of the early universe


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