Hi, I am looking into symmetry breaking and how it (may have) affected the photon/baryon ratio in the primordial universe. I found this wonderful encyclopaedia of cosmology which relates the grand unified theory to an orthorhombic crystal, making analogies for symmetry, spontaneous symmetry breaking, low energy physics and high energy physics. While I feel I am getting somewhere with understanding symmetry breaking, I cannot work out how it is supposed to relate to the ratio of baryons to photons. Is anyone able to give me a clue on this, or know of a good reference for it? Or even if there have been any studies into exactly this? I keep getting a lot of information about the still recent Higgs boson experiments, and while they are related, I do not believe they are quite what I am looking for. Thanks for your help :) PS. I'm not sure if this belongs in the particle physics section, or the beyond the standard model section?