Journal
PHYSICAL REVIEW D
Volume 71, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.71.027301
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Single scalar field inflation with a generic, nonquadratic in derivatives, field Lagrangian is considered. It is shown that non-Gaussianity of curvature perturbations is characterized by two dimensionless amplitudes. One of these amplitudes can be expressed in terms of the usual inflationary observables-the scalar power, the tensor power, and the tensor index. This consistency relation provides an observational test for the single scalar inflation.
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