Non-Gaussianities in models with a varying inflaton decay rate
| dc.creator | Zaldarriaga, Matias | |
| dc.date | 2003-05-30 | |
| dc.date.accessioned | 2026-07-07T11:08:14Z | |
| dc.date.available | 2026-07-07T11:08:14Z | |
| dc.description | We consider the expected level of primordial non-Gaussianities in models in which density perturbations are produced by spatial fluctuations in the decay rate of the inflaton. We consider both the non-Gaussianities resulting from the self-couplings of the field that controls the decay rate as well as from the non-linear relation between field and curvature perturbations. We show that in these scenario non-Gaussianities are of the "local" form, that is well described be the ansatz R =Rg + f_{NL} (Rg^2 - <Rg^2>). This is a consequence of the fact that they were created when modes were already outside the horizon. We show that f_{NL} is naturally of order a few in these models, much larger than what is expected in the standard one field models of inflation (f_{NL}\sim 10^{-2}) and possibly accessible to observations. | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0306006 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0306006 | |
| dc.identifier | Phys.Rev.D69:043508,2004 | |
| dc.identifier | doi:10.1103/PhysRevD.69.043508 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/190067 | |
| dc.subject | Astrophysics | |
| dc.title | Non-Gaussianities in models with a varying inflaton decay rate | |
| dc.type | text |