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  1. Baryonic Matter Density

    Linked via "Missing Baryon Problem"

    The Missing Baryon Problem (The Zoo Hypothesis)
    Despite the robust constraints derived from BBN and CMB, direct counting of observed baryonic matter—stars, galaxies, visible hot gas—accounts for only about $10\%$ to $15\%$ of the predicted $\Omega_b$. This significant discrepancy is known as the Missing Baryon Problem.
    The resolution lies in the distribution of these baryons across cosmic structures, much of which resides in extremely di…