Speaker
Description
Full non-linear simulations of massless preheating model have revealed a large non-Gaussianity can be generated. We study a more observationally viable model consisting of inflaton non-minimally coupled to gravity that decays into a massless scalar spectator during preheating.
Including the scale-dependence of Hubble rate places tight constraints on the 'cosmic variance', the values which the mean spectator field value can take. A negligible cosmic variance forces mean close to zero, and symmetry of many inflation potentials around zero dictates leading order non-perturbative treatment shall fail. Thus, we calculate sub-leading order term in the non-perturbative delta N formalism. As this calculation also needs to be performed keeping in mind the scale dependence, we show a scale-invariant way of solving momentum integrals is insufficient to yield the correct non-Gaussianity from preheating.
| Type of presentation | 20 minute talk |
|---|---|
| Would you be interested in receiving feedback on your presentation? | Yes |
| Are you happy for your talk to be recorded? | Yes |
| Please select the most relevant category | Cosmology |
