Do Stops Slow Down Electroweak Bubble Walls?
arXiv:hep-ph/0002050 · doi:10.1016/S0550-3213(00)00768-9
Abstract
We compute the wall velocity in the MSSM. We therefore generalize the SM equations of motion for bubble walls moving through a hot plasma at the electroweak phase transition and calculate the friction terms which describe the viscosity of the plasma. We give the general expressions and apply them to a simple model where stops, tops and W bosons contribute to the friction. In a wide range of parameters including those which fulfil the requirements of baryogenesis we find a wall velocity of order v = 0.05-0.1 much below the SM value.
Numerical error corrected, result qualitatively unchanged
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