Regular Article - Theoretical Physics
Schwinger–Keldysh mechanism in extended quasi-single field inflation
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), P. O. Box 19395-5531, Tehran, Iran
2 Center for Space Research, North-West University, Mafikeng, South Africa
Accepted: 17 May 2019
Published online: 28 May 2019
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.
© The Author(s), 2019