Non-Adiabatic Perturbations from Single-Field Inflation
| dc.creator | Armendariz-Picon, C. | |
| dc.date | 2003-12-16 | |
| dc.date | 2004-02-13 | |
| dc.date.accessioned | 2026-07-07T02:11:36Z | |
| dc.date.available | 2026-07-07T02:11:36Z | |
| dc.description | If the inflaton decays into several components during reheating, and if the corresponding decay rates are functions of spacetime-dependent quantities, it is possible to generate entropy perturbations after a stage of single-field inflation. In this paper, I present a simple toy example that illustrates this possibility. In the example, the decay rates of the inflaton into ``matter'' and ``radiation'' are different functions of the total energy density. In particular cases, one can exactly solve the equations of motion both for background and perturbations in the long-wavelength limit, and show that entropy perturbations do indeed arise. Beyond these specific examples, I attempt to identify what are the essential ingredients responsible for the generation of entropy perturbations after single-field inflation, and to what extent these elements are expected to be present in realistic models. | |
| dc.description | 13 pages, 1 figure; uses RevTeX4.v2: Note in proof and references added | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0312389 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0312389 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/7147 | |
| dc.subject | Astrophysics | |
| dc.title | Non-Adiabatic Perturbations from Single-Field Inflation | |
| dc.type | text |