Speaker
Description
We consider a Bubble Expansion mechanism for the production of scalar dark matter during a first-order phase transition in the early Universe. Seeking for a dark matter energy density in agreement with observations, we study different renormalizable and non-renormalizable interactions between the dark matter species and the field undergoing the transition, considering all the possible regimes for the Lorentz boost factor associated to the bubble wall motion. It is shown that is possible to have a sufficient DM production in the so far unexplored low-velocities regime, enlarging the parameter space and the possibilities for the BE mechanism. Additionally, it is found that non-renormalizable interactions exhibit a behavior very similar to the renormalizable case, even for low values of the Lorentz factor. Furthermore, for a transition around the electroweak scale, the associated gravitational wave spectrum is also within the reach of future detectors.
