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Hydrogen oscillation into a dark-sector state $H'$ has recently been proposedas a novel mechanism through which hydrogen can be cooled during the dark ages-- without direct couplings between the Standard Model and dark matter. In thiswork we demonstrate that the requisite mixing can appear naturally from amicrophysical theory, and argue that the startling deviations from standardcosmology are nonetheless consistent with observations. A symmetric mirrormodel enforces the necessary degeneracy between $H$ and $H'$, and an additionaltwisted $B+L'$ symmetry dictates that $H$-$H'$ mixing is the leading connectionbetween the sectors. We write down a UV completion where $\sim$ TeV-scaleleptoquarks generate the partonic dimension-12 mixing operator, thus linking tothe energy frontier. With half of all $H$ atoms oscillating into $H'$, thecomposition of the universe is scandalously different during part of itshistory. We qualitatively discuss structure formation: both the modificationsto it in the Standard Model sector and the possibility of it in the mirrorsector, which has recently been proposed as a resolution to the puzzle of earlysupermassive black holes. While the egregious loss of SM baryons mostlyself-erases during reionization, to our knowledge this is the first model thatsuggests there should be missing baryons in the late universe, and highlymotivates a continued, robust observational program of high-precision searchesfor cosmic baryons.

The Hydrogen Mixing Portal, Its Origins, and Its Cosmological Effects