Modified hydrogen recombination rate due to non-Hubble redshift effects
The study modifies standard recombination calculations by including corrections from Lyman-alpha photons interacting with moving neutral hydrogen atoms due to cosmic expansion (non-Hubble redshift effects). This modification suggests that these interactions can resolve tensions between cosmological measurements, favoring slightly higher Hubble constant ($H_0$) and smaller matter density ($\Omega_m$) compared to the standard $\Lambda$CDM model.