Thermal Effects and Sudden Decay Approximation in the Curvaton Scenario
arXiv:1407.5148 · doi:10.1088/1475-7516/2014/10/032
Abstract
We study the impact of a temperature-dependent curvaton decay rate on the primordial curvature perturbation generated in the curvaton scenario. Using the familiar sudden decay approximation, we obtain an analytical expression for the curvature perturbation after the decay of the curvaton. We then investigate numerically the evolution of the background and of the perturbations during the decay. We first show that the instantaneous transfer coefficient, related to the curvaton energy fraction at the decay, can be extended into a more general parameter, which depends on the net transfer of the curvaton energy into radiation energy or, equivalently, on the total entropy ratio after the complete curvaton decay. We then compute the curvature perturbation and compare this result with the sudden decay approximation prediction.
23 pages, 9 figures
References in corpus (9)
- Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models
- A numerical study of non-gaussianity in the curvaton scenario
- Dynamics of oscillating scalar field in thermal environment
- 21-cm Background Anisotropies Can Discern Primordial Non-Gaussianity
- Moduli decay in the hot early Universe
- Remarks about the Tensor Mode Detection by the BICEP2 Collaboration and the Super-Planckian Excursions of the Inflaton Field
- General treatment of isocurvature perturbations and non-Gaussianities
- On bulk viscosity and moduli decay
- Curvaton in large field inflation