Schwinger–Keldysh mechanism in extended quasi-single field inflation
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 th...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-05-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-019-6969-z |
| Summary: | 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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| ISSN: | 1434-6044 1434-6052 |