Yacine Ali-Haïmoud, with Christopher M. Hirata, produced the HyRec model of primordial hydrogen and helium recombination. It combines an effective multilevel-atom treatment with detailed photon transport while exploiting the sparse coupling structure to make repeated cosmological calculations practical.[ref]
This connects atomic transition rates to cosmological inference: a changed recombination history changes the probability that a cosmic microwave background photon scatters before reaching the observer.
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