An algebraic degeneracy makes all reionization-history observables sensitive only to the product of escape fraction and star formation efficiency, explaining parameter tensions and limiting dark matter constraints from reionization data.
L.et al.A Long Time Ago in a Galaxy Far, Far Away: A Candidate z∼12 Galaxy in Early JWST CEERS Imaging.apjl940, L55 (2022)
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A structural degeneracy explains reionization tensions and limits dark matter constraints
An algebraic degeneracy makes all reionization-history observables sensitive only to the product of escape fraction and star formation efficiency, explaining parameter tensions and limiting dark matter constraints from reionization data.