Loop corrections and a new test of inflation

Gianmassimo Tasinato, Christian T. Byrnes, Sami Nurmi, David Wands

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Inflation is the leading paradigm for explaining the origin of primordial density perturbations and the observed temperature fluctuations of the cosmic microwave background. However many open questions remain, in particular whether one or more scalar fields were present during inflation and how they contributed to the primordial density perturbation. We propose a new observational test of whether multiple fields, or only one (not necessarily the inflaton) generated the perturbations. We show that our test, relating the bispectrum and trispectrum, is protected against loop corrections at all orders, unlike previous relations.
Original languageEnglish
Pages (from-to)043512
Number of pages1
JournalPhysical Review D
Issue number4
Publication statusPublished - 15 Feb 2013


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