= Photon underproduction crisis
{wiki=Photon_underproduction_crisis}
The Photon Underproduction Crisis refers to a discrepancy within the field of cosmology related to observations of the cosmic microwave background (CMB) radiation and the number of photons produced during the early universe. Specifically, it highlights a tension between the observed abundance of galaxies and the predictions based on the standard model of cosmology, particularly the Lambda Cold Dark Matter (ΛCDM) model.
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