Quantitative bispectra from multifield inflation
| dc.creator | Rigopoulos, G. I. | |
| dc.creator | Shellard, E. P. S. | |
| dc.creator | van Tent, B. J. W. | |
| dc.date | 2005-11-01 | |
| dc.date | 2007-11-28 | |
| dc.date.accessioned | 2026-07-07T11:57:17Z | |
| dc.date.available | 2026-07-07T11:57:17Z | |
| dc.description | After simplifying and improving the non-Gaussian formalism we developed in previous work, we derive a quantitative expression for the three-point correlator (bispectrum) of the curvature perturbation in general multiple-field inflation models. Our result describes the evolution of non-Gaussianity on superhorizon scales caused by the nonlinear influence of isocurvature perturbations on the adiabatic perturbation during inflation. We then study a simple quadratic two-field potential and find that when slow roll breaks down and the field trajectory changes direction in field space, the non-Gaussianity can become large. However, for the simple models studied to date, the magnitude of this non-Gaussianity decays away after the isocurvature mode is converted into the adiabatic mode. | |
| dc.description | 7 pages, 1 figure. v4: Added remarks on momentum dependence, minor textual changes, matches published version | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0511041 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0511041 | |
| dc.identifier | Phys.Rev.D76:083512,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.76.083512 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/205827 | |
| dc.subject | Astrophysics | |
| dc.title | Quantitative bispectra from multifield inflation | |
| dc.type | text |