Speaker
Benoit Laurent
(CEA / DAM Ile de France (FR))
Description
In this talk, I will take advantage of recent progress on wall speed determination to provide simple estimates that constrain the wall velocity between two opposite limits: local thermal equilibrium and ballistic. The description of the wall velocity in these limits is significantly simplified compared to conventional methods, which allows for the derivation of analytic formulas valid for slow walls. As an example, I will apply this new approach to the QCD phase transition, which can be made first-order with a large baryon chemical potential. Using these bounds on the wall velocity, I will show that previous studies greatly overestimated the amplitude of GWs produced by assuming luminal wall speeds.
