Events

Past Event

Theory Seminar: “Dissipative Inflation via Scalar Production” with Dr. Luca Santoni

September 11, 2023
2:10 PM - 3:10 PM
Event time is displayed in your time zone.
Center for Theoretical Physics (Pupin Hall 8th Floor)

“Dissipative Inflation via Scalar Production”

I will describe a new mechanism that gives rise to dissipation during cosmic inflation. In the simplest implementation, the mechanism requires the presence of a massive scalar field with a softly-broken global U(1) symmetry, along with the inflaton field. Particle production in this scenario takes place on parametrically sub-horizon scales, as opposed to the case of dissipation into gauge fields. Consequently, the backreaction of the produced particles on the inflationary dynamics can be treated in a local manner, allowing us to compute their effects analytically. I will show the parametric dependence of the power spectrum and its deviation from the usual slow-roll expression. I will show that non-Gaussianities are always sizeable whenever perturbations are generated by the noise induced by dissipation