We study the dynamics of the electroweak phase transition in a simple extension of the Standard Model where the Higgs sector is extended by adding an S U ( 2 ) L triplet with hypercharge Y = 2 . By making random scans over the parameters of the model, we show that there are regions consistent with constraints from collider experiments and the requirement for a strong first-order electroweak phase transition which is needed for electroweak baryogenesis. Further, we also study the power spectrum of the gravitational waves that can be generated due to the first-order phase transitions. Moreover, the detectability of these gravitational waves, via future space-based detectors, is discussed.
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