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.
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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.