Two-field analysis of no-scale supergravity inflation

John Ellis, Marcos A.G. García, Dimitri V. Nanopoulos, Keith A. Olive

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Since the building-blocks of supersymmetric models include chiral superfields containing pairs of effective scalar fields, a two-field approach is particularly appropriate for models of inflation based on supergravity. In this paper, we generalize the two-field analysis of the inflationary power spectrum to supergravity models with arbitrary Kähler potential. We show how two-field effects in the context of no-scale supergravity can alter the model predictions for the scalar spectral index ns and the tensor-to-scalar ratio r, yielding results that interpolate between the Planck-friendly Starobinsky model and BICEP2-friendly predictions. In particular, we show that two-field effects in a chaotic no-scale inflation model with a quadratic potential are capable of reducing r to very small values 蠑0.1. We also calculate the non-Gaussianity measure fNL, finding that is well below the current experimental sensitivity.

Original languageEnglish (US)
Article number010
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
StatePublished - Jan 1 2015

Bibliographical note

Publisher Copyright:
© 2015, Institute of Physics Publishing. All rights reserved.


  • inflation
  • particle physics - cosmology connection
  • supersymmetry and cosmology


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