Primordial trispectrum from inflation

Byrnes C, Sasaki M, Wands D (2006)
Phys.Rev.D 74(12): 12351.

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We use the delta N-formalism to describe the leading order contributions tothe primordial power spectrum, bispectrum and trispectrum in multiple-fieldmodels of inflation at leading order in a perturbative expansion. In slow-rollmodels 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 bytwo non-linearity parameters, tau_{NL} and g_{NL}, which are dependent upon thesecond and third derivatives of the local expansion with respect to the fieldvalues during inflation.
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Byrnes C, Sasaki M, Wands D. Primordial trispectrum from inflation. Phys.Rev.D. 2006;74(12):12351.
Byrnes, C., Sasaki, M., & Wands, D. (2006). Primordial trispectrum from inflation. Phys.Rev.D, 74(12), 12351. doi:10.1103/PhysRevD.74.123519
Byrnes, C., Sasaki, M., and Wands, D. (2006). Primordial trispectrum from inflation. Phys.Rev.D 74, 12351.
Byrnes, C., Sasaki, M., & Wands, D., 2006. Primordial trispectrum from inflation. Phys.Rev.D, 74(12), p 12351.
C. Byrnes, M. Sasaki, and D. Wands, “Primordial trispectrum from inflation”, Phys.Rev.D, vol. 74, 2006, pp. 12351.
Byrnes, C., Sasaki, M., Wands, D.: Primordial trispectrum from inflation. Phys.Rev.D. 74, 12351 (2006).
Byrnes, Christian, Sasaki, Misao, and Wands, David. “Primordial trispectrum from inflation”. Phys.Rev.D 74.12 (2006): 12351.
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