Speaker
Description
A cosmological first-order phase transition during the evolution of the Universe can give rise to intriguing phenomena like electroweak baryogenesis or the generation of a stochastic background of gravitational waves through bubble nucleation. This study aims at exploring critical aspects of the bubble wall velocity, which significantly impact these phenomena. Recent investigations have highlighted a singularity in the friction terms as the terminal wall velocity approaches the speed of sound; this behavior has been attributed to the linearization procedure. We try to solve this issue by proposing modifications to this procedure, employing non-equilibrium physics techniques; our aim would be to prevent the emergence of the singularity and ensure physical consistency.
