Sustainability of multi-field inflation and bound on string scale

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We study the effects of the interaction terms between the inflaton fields on the inflationary dynamics in multi-field models. With power law type potential and interactions, the total number of e-folds may get considerably reduced and can lead to unacceptably short period of inflation. Also we point out that this can place a bound on the characteristic scale of the underlying theory such as string theory. Using a simple multi-field chaotic inflation model from string theory, the string scale is constrained to be larger than the scale of grand unified theory. Allowing post-inflationary generation of perturbation can greatly alleviate this constrain.

Original languageEnglish
Pages (from-to)2119-2132
Number of pages14
JournalModern Physics Letters A
Issue number26
StatePublished - 30 Aug 2009


  • Inflation
  • String theory


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