Velocity of electroweak bubble walls

Details Velocity of electroweak bubble walls Velocity of electroweak bubble walls

2009-08-25

arxiv.org/abs/0908.3663v2

Nucl.Phys.B825:151-176,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 10 figures. v2: Minor corrections, a comment and references added

Scientific paper

10.1016/j.nuclphysb.2009.09.019

We study the velocity of bubble walls in the electroweak phase transition. For several extensions of the Standard Model, we estimate the friction and calculate the wall velocity, taking into account the hydrodynamics. We find that deflagrations are generally more likely than detonations. Nevertheless, for models with extra bosons, which give a strongly first-order phase transition, the deflagration velocity is in general quite high, $0.1\lesssim v_w\lesssim 0.6$. Therefore, such phase transitions may produce an important signal of gravitational waves. On the other hand, models with extra fermions which are strongly coupled to the Higgs boson may provide a strongly first-order phase transition and small velocities, $10^{-2}\lesssim v_w\lesssim 10^{-1}$, as required by electroweak baryogenesis.

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