Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.251301
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Funding
- NSF [PHY-0758153]
- Tohoku University
- JAPA [18072001, 20540245]
- Core-to-Core
- Grants-in-Aid for Scientific Research [18072001, 23540282] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien
- Division Of Physics [0758153] Funding Source: National Science Foundation
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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 delta N formalism obey an inequality between f(NL) and one of the local-form trispectrum amplitudes, tau(NL), such that tau(NL) > 1/2(6/5 f(NL))(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.
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