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Paper   IPM / Astronomy / 16276
School of Astronomy
  Title:   Schwinger-Keldysh mechanism in extended quasi single field inflation
  Author(s):  Haidar . Sheikhahmadi
  Status:   Published
  Journal: Eur. Phys. J. C
  Vol.:  451
  Year:  2019
  Supported by:            ipm IPM
  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.

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