Large non-Gaussianities with intermediate shapes from quasi-single-field inflation
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Chen-2010-Large non-Gaussianit.pdf
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Author(s)
Chen, Xingang
Wang, Yi
Date Issued
March 2010
Journal
Physical Review D
Publisher
American Physical Society
Citation
Chen, Xingang, and Yi Wang. "Large non-Gaussianities with intermediate shapes from quasi-single-field inflation." Physical Review D 81.6 (2010): 063511. © 2010 The American Physical Society.
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.81.063511
