I am trying to make sure my understanding is correct.
At energies and temperatures found during the big bang (or at CERN recently), the Higgs mechanism comes into effect. When it does, there is a break in electroweak symmetry (because the field is unstable?) and a condensate is formed. This condensate is what allows bosons to gain mass.
So at the moment of the big bang, all the bosons (and fermions I suppose) were massless (due to symmetry), and then at some point after the big bang when the temperature of the universe was just so, the Higgs mechanism took hold and gave the particles mass.
Is this correct?