From Boltzmann equations to steady wall velocities

Thomas Konstandin, Germano Nardini, Ingo Rues
2014 Journal of Cosmology and Astroparticle Physics  
By means of a relativistic microscopic approach we calculate the expansion velocity of bubbles generated during a first-order electroweak phase transition. In particular, we use the gradient expansion of the Kadanoff-Baym equations to set up the fluid system. This turns out to be equivalent to the one found in the semi-classical approach in the non-relativistic limit. Finally, by including hydrodynamic deflagration effects and solving the Higgs equations of motion in the fluid, we determine
more » ... d, we determine velocity and thickness of the bubble walls. Our findings are compared with phenomenological models of wall velocities. As illustrative examples, we apply these results to three theories providing first-order phase transitions with a particle content in the thermal plasma that resembles the Standard Model.
doi:10.1088/1475-7516/2014/09/028 fatcat:ipcegemz4rcwbccwpffu5gwqci