  A first order electroweak phase transition probes physics beyond the Standard
Model on multiple frontiers and therefore is of immense interest for
theoretical exploration. We conduct a model-independent study of the effects of
relevant dimension 6 operators, of the Standard Model Effective Field Theory,
on electroweak phase transition. We use a thermally corrected and
renormalization group improved potential and study its impact on nucleation
temperature. We then outline bubble dynamics that lead to ultra-relativistic
bubble wall velocities which are mainly motivated from the viewpoint of
gravitational wave detection. We highlight the ranges of the Wilson
coefficients that give rise to such bubble wall velocities and predict
gravitational wave spectra generated by such transitions which can be tested in
future experiments. The low new physics scale necessitates the inclusion of
dimension 8 contributions. We also quantify their impact on ultra-relativistic
bubble wall dynamics.
