Revisiting non-Gaussianity of multiple-field inflation from the field equation
| dc.creator | Li, Shi-Wen | |
| dc.creator | Xue, Wei | |
| dc.date | 2008-04-03 | |
| dc.date.accessioned | 2026-07-07T09:30:07Z | |
| dc.date.available | 2026-07-07T09:30:07Z | |
| dc.description | In the present paper, we study the non-Gaussianity of multiple-field inflation model using the method of the field equation. We start from reviewing the background and the perturbation theory of multiple-field inflation, and then derive the Klein-Gorden equation for the perturbations at second order. Afterward, we calculate the tree-level bispectrum of the fields' perturbations and finally give the corresponding parameter $f_{NL}$ for the curvature perturbation $ζ$ in virtue of the $δN$ formalism. We also compare our result with the one already obtained from the Lagrangian formalism, and find they are consistent. This work may help us understand perturbation theory of inflation more deeply. | |
| dc.description | 19 pages | |
| dc.identifier | https://arxiv.org/abs/0804.0574 | |
| dc.identifier | http://arxiv.org/abs/0804.0574 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/158028 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Revisiting non-Gaussianity of multiple-field inflation from the field equation | |
| dc.type | text |