Speaker
Description
In the traditional view, a cosmic first-order phase transition cannot occur without the nucleation of a few bubbles within the entire Hubble volume. However, the presence of domain walls during the transition can significantly alter the dynamics of the process. Using lattice simulations, we demonstrate that thermal fluctuations can destabilize domain walls, which then transform into domain trenches of the true vacuum, ultimately leading to successful phase transitions without bubble formation. By providing an analytical method to estimate the rescue temperature, we use the $Z_2$-odd singlet model as an example and conclude that the bubble-free mechanism developed in this work offers a competing pathway for completing phase transitions via quantum tunneling, thereby opening up a new viable parameter space.
