Studying dark gaps in Lyman-α forest transmission with large reionization simulations

May 19, 2026

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Key Points

This research aims to investigate the Lyman-α forest dark-gap distribution as a tracer of the intergalactic medium during late cosmic reionization.
Used a large-volume simulation framework to model various scenarios of reionization parameters.
Constructed synthetic sightlines and compared the dark gaps' cumulative distribution with observed spectra.
Analyzed different reionization redshifts, IGM temperatures, and ionizing-photon mean free paths.
Most models showed qualitative agreement with observed dark gaps.
The model with a later reionization completion at z∼ 5.4 matched best with observational data.
Models could not replicate observed strong flux correlations at larger scales, highlighting gaps in current understanding.

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Examines dark gap distribution in the Lyman-α forest, indicating implications for cosmic reionization.

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Maity et al. (2026) studied this question.

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