hi, I am studying the Higgs Mechanism these days. And I get two questions. I hope some ones could help me. 1>We know that due to the non-zero VEV, SSB takes place and higgs condensates give masses to bosons and fermions. I wonder that after the SSB and before the universe became as cool as today, what are different points? All the masses should be smaller, and what about renormalization? 2>When the universe was hot enough that all partiles are massless, what Fermi-Dirac distribution and Pauli exclusion principle would be ? Thanks.