Journal
PHYSICAL REVIEW D
Volume 81, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.063511
Keywords
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Funding
- US DOE [DEFG02-05ER41360]
- NSFC
- NSERC
- IPP
- STFC [ST/F002998/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002998/1] Funding Source: researchfish
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We study the slow-roll inflation models, where the inflaton slow-rolls along a trajectory whose orthogonal directions are lifted by potentials with masses of order the Hubble parameter. In these models large non-Gaussianities can be generated through the transformation from the isocurvature modes to the curvature mode, once the inflaton trajectory turns. We find large bispectra with a one-parameter family of novel shapes, interpolating between the equilateral and local shape. According to the in-in formalism, the shapes of these non-Gaussianities are different from a simple projection from the isocurvature non-Gaussian correlation functions.
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