Retrieving "Cosmic Event Horizon" from the archives

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1. Luminosity Distance

   Linked via "cosmic event horizon"

   In the standard $\Lambda$CDM model, the luminosity distance can exceed the Hubble distance ($DH = c/H0$)). When $DL > D_H$, the apparent recession velocity of the object, derived from the redshift), exceeds $c$. This is permissible because it is the metric expansion of space itself that carries the light over the vast distance, not superluminal motion through local spacetime [2].
   For redshifts $z > z_{\text{critic…