Many-field inflation: universality or prior dependence?

Perseas Christodoulidis*, Diederik Roest, Robert Rosati

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)
54 Downloads (Pure)


We investigate the observational signatures of many-field inflation and present analytic expressions for the spectral index as a function of the prior. For a given prior we employ the central limit theorem and the horizon crossing approximation to derive universal predictions. These include a specific dependence on the prior choice for initial conditions that has not been seen in previous studies. Our main focus is on quadratic inflation, for which the initial conditions statistics decouple from those of the mass distribution, while other monomials are also briefly discussed. We verify the validity of our calculations by comparing to full numerical simulations with 100 fields using the transport method.

Original languageEnglish
Article number021
Number of pages12
JournalJournal of Cosmology and Astroparticle Physics
Issue number4
Publication statusPublished - Apr-2020


  • inflation
  • initial conditions and eternal universe


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