EPP Theory Seminar: Djuna Croon (TRIUMF) - Rethinking false vacuum decay
Future gravitational wave interferometers may provide the first direct probe of the first second of our Universe. A first order phase transition in the early Universe would have sourced a stochastic gravitational wave background (SGWB). However, existing methods used to predict this SGWB are limited to weakly-coupled theories and plagued by large uncertainties. In this talk, I will motivate that these obstacles can be overcome through an alternate definition of the action for local regions of field space, which has a natural implementation in the functional renormalization group. Importantly, this method allows for more reliable predictions for strongly interacting theories. I will demonstrate how this works in a toy model example, and sketch the way towards accurate gravitational phenomenology and other applications.