Schwinger-Keldysh mechanism in extended quasi single field inflation
arXiv:1901.01905 · doi:10.1140/epjc/s10052-019-6969-z
Abstract
We study an extension of quasi-single field model of inflation containing multiple semi-heavy isocurvaton fields using the Schwinger-Keldysh mechanism. We calculate the amplitudes and the shapes of the bispectrum and the trispectrum. We show that the diagrammatic approach associated with the Schwinger-Keldysh mechanism simplifies the analysis considerably compared to standard in-in formalism. This method is helpful to study the spectroscopy of masses and couplings of light and semi-heavy fields during inflation.
arXiv comment28 pages, 27 figures
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