Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-25
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.
Megevand Ariel
Sanchez Alejandro D.
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