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Atomic dark matter is usually considered to be produced asymmetrically in theearly Universe. In this work, we first propose that the symmetric atomic darkmatter can be thermally produced through the freeze-out mechanism. The dominantatom anti-atom annihilation channel is the atomic rearrangement. It has ageometrical cross section much larger than that of elementary fermions. Afterthe atomic formation, this annihilation process further depletes dark matterparticles and finally freezes out. To give the observed dark matter relic, thedark atoms are naturally ultraheavy, ranging from $10^6$ to $10^{10}\,\mathrm{GeV}$.

Ultraheavy Atomic Dark Matter Freeze-Out through Rearrangement