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12.4. Simulations of the formation of Galaxies

Ostriker (private communication) notes that the Omegab can be constrained to a factor of two of that derived from SBBN using low D/H by the requirement that these baryons make galaxies. Semi-analytic models can also address the distribution of baryons in temperature and the total required to make observed structures (Frenk & Baugh, personal communication).