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Primordial nucleosynthesis is inevitable during the early evolution of an expanding universe filled with radiation and matter (baryons). However, the precise abundance yields depend sensitively on the baryon density, the radiation content and the early expansion rate. For "standard" big bang nucleosynthesis (SBBN) only D, ^3He, ^4He and ^7Li are produced in astrophysically interesting abundances which depend on only one "free" parameter, η = n_ B/n_γ, the ratio of baryons (nucleons) to photons.arXiv:astro-ph/9608084v1 fatcat:vkbkfd22srcffchw3fomgnxame