Upper limit on first-order electroweak phase transition strength
arXiv:2001.05973 · doi:10.1142/S0217751X2150024X
Abstract
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 velocity of the boundary between the phases, the so-called bubble wall, can become ultra-relativistic if the friction due to the plasma of particles is not sufficient to retard the wall's acceleration. This bubble ``runaway'' 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.
arXiv commentv2: accepted for publication at the IJMPA
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