A known degeneracy between star formation efficiency and ionizing escape fraction is broken using JWST UV luminosity function shapes, excluding the early galaxy crisis at 4.5 sigma and yielding the first f_esc(z) reconstruction from z=7 to 12.
L.et al.Conditions for Reionizing the Universe with A Low Galaxy Ionizing Photon Escape Fraction.Astrophys
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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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The JWST early galaxy crisis resolved by a reionization degeneracy
A known degeneracy between star formation efficiency and ionizing escape fraction is broken using JWST UV luminosity function shapes, excluding the early galaxy crisis at 4.5 sigma and yielding the first f_esc(z) reconstruction from z=7 to 12.
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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.