Primordial trispectrum from inflation

Journal Article · Fri Dec 15 04:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.74.123519· OSTI ID:20868189

Byrnes, Christian T; Wands, David ^[1]; Sasaki, Misao ^[2]

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1. Institute of Cosmology and Gravitation, Mercantile House, University of Portsmouth, Portsmouth PO1 2EG (United Kingdom)
2. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8503 (Japan)

We use the {delta}N formalism to describe the leading order contributions to the primordial power spectrum, bispectrum, and trispectrum in multiple-field models of inflation at leading order in a perturbative expansion. In slow-roll models where the initial field fluctuations at Hubble exit are nearly Gaussian, any detectable non-Gaussianity is expected to come from super-Hubble evolution. We show that the contribution to the primordial trispectrum can be described by two nonlinearity parameters, {tau}{sub NL} and g{sub NL}, which are dependent upon the second and third derivatives of the local expansion with respect to the field values during inflation.

• OSTI ID: 20868189
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 12 Vol. 74; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGY
ENERGY SPECTRA
EXPANSION
FLUCTUATIONS
INFLATIONARY UNIVERSE
NONLINEAR PROBLEMS