The Higgs mechanism gave mass to all of the particles of which the Universe is comprised. To better understand how this happened, we model first-order phase transitions where a scalar field, the Higgs, is coupled to a fluid, which represents all the particles in the Universe. Starting with the stress-energy tensor for a scalar field, we derive equations of motion for this system. We then nucleate Gaussian bubbles in the broken state and model their expansion and coalescence. The evolution is done using GABE (Grid and Bubble Evolver) and we observe the resulting evolution and collisions. We find that it is difficult to stably evolve this system.
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