Non-gaussianity consistency relation for multifield inflation

Naonori Suma Sugiyama, Eiichiro Komatsu, Toshifumi Futamase

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


While detection of the "local form" bispectrum of primordial perturbations would rule out all single-field inflation models, multifield models would still be allowed. We show that multifield models described by the δN formalism obey an inequality between fNL and one of the local-form trispectrum amplitudes, τNL, such that τNL>12(65fNL)2 with a possible logarithmic scale dependence, provided that 2-loop terms are small. Detection of a violation of this inequality would rule out most of multifield models, challenging inflation as a mechanism for generating the primoridal perturbations.

Original languageEnglish
Article number251301
JournalPhysical review letters
Issue number25
Publication statusPublished - 2011 Jun 24

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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