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[[UTAPwiki/セミナー/初期宇宙・相対論速報]] Naoya Kobayashi (CITA, U. Toronto), TBA Naoya Kobayashi (CITA, U. Toronto) Title: "Rolling in the Modulated Reheating Scenario" Abstract: In the modulated reheated scenario, the field that drives inflation has a spatially-varying decay rate, and the resulting inhomogeneous reheating process generates adiabatic perturbations. In this talk, I describe the power spectrum and the bispectrum of the density perturbations generated in this scenario. Our derivation carefully follows the dynamics of the field that perturbs the inflaton decay rate. I will show that the statistics of the perturbations can be greatly modified by the dynamics of this modulus field, even if the field has a simple potential and a small effective mass compared to the Hubble scale. I will present examples in which non-Gaussianity is amplified by the modulus dynamics to values that are forbidden by Planck. Therefore, a proper treatment of the modulus dynamics is important in order to accurately calculate the resulting perturbations from modulated reheating. |