The Lyman-alpha forest and the Gunn-Peterson opacity rise at high redshift are treated by the standard model as a direct observational window onto cosmic reionization. This paper demonstrates that the relevant observational classes - forest-like absorption hierarchies, Gunn-Peterson troughs, and damping-wing-like red-side suppression - are all non-unique with respect to underlying absorber architecture. The central mechanism is the Absorption Percolation Threshold (APT): a smooth increase in line-of-sight absorber encounter rate naturally produces a sharply nonlinear collapse in transmitted flux without any imposed cosmological phase transition. Five proof-of-concept simulations confirm this, with transmitted flux declining from 1.000 to 0.042, the apparent onset redshift shifting by 0.9 in z across modest environmental changes, and forest-like, trough-like, and damping-wing-like spectral classes all reproduced by multiple distinct absorber architectures. The high-redshift opacity rise is more naturally read as a line-of-sight visibility threshold in a structured absorber field than as a uniquely identified global boundary in cosmic time.
V. K. Sharma (Thu,) studied this question.
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