http://arxiv.org/abs/2001.05973
For a cosmological first-order electroweak phase transition, requiring no sphaleron washout of baryon number violating processes leads to a lower bound on the strength of the transition. The phases interface, the so-called bubble wall, velocity can become ultra-relativistic if the friction on the wall due to primordial plasma of particles surrounding it is not sufficient to retard the wall acceleration down to a steady speed. This bubble “runs away” should not occur if a successful baryon asymmetry generation due to the transition is required. Using Boedeker-Moore criterion for bubble wall runaway, within the context of an extension of the standard model of particle physics with a real gauge-single scalar field, we show that a non runaway transition requirement puts an upper bound on the strength of the first-order phase transition.
S. AbdusSalam, L. Kalhor and M. Kazemi
Fri, 17 Jan 20
45/60
Comments: N/A