Towards general patterns of features in multi-field inflation

Xian Gao, Jinn Ouk Gong

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18 Scopus citations


Abstract: We investigate the consequences of general curved trajectories in multi-field inflation. After setting up a completely general formalism using the mass basis, which naturally accommodates the notion of light and heavy modes, we study in detail the simple case of two successive turns in two-field system. We find the power spectrum of the curvature perturbation receives corrections that exhibit oscillatory features sinusoidal in the logarithm of the comoving wavenumber without slow-roll suppression. We show that this is because of the resonance of the heavy modes inside and outside the mass horizon.

Original languageEnglish
Article number115
JournalJournal of High Energy Physics
Issue number8
StatePublished - 31 Aug 2015

Bibliographical note

Publisher Copyright:
© 2015, The Author(s).


  • Cosmology of Theories beyond the SM
  • Effective field theories


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