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  1. Luminosity Distance

    Linked via "comoving distance $D_C$"

    $$DL = (1+z) DM$$
    In a spatially flat universe ($\Omegak = 0$), $DM$ simplifies to the comoving distance $DC$, and consequently $DL = (1+z) D_C$.
    Relation to Observables and the Distance Modulus