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Rapid bound-state formation of Dark Matter in the Early Universe · Around

2019

Rapid bound-state formation of Dark Matter in the Early Universe

Binder, Tobias, Mukaida, Kyohei, Petraki, Kalliopi

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The thermal decoupling description of dark matter (DM) and co-annihilating partners is reconsidered.

If DM is realized at around the TeV-mass region or above, even the heaviest electroweak force carriers could act as long-range forces, leading to the existence of meta-stable DM bound states.
The formation and subsequent decay of the latter further deplete the relic density during the freeze-out process on top of the Sommerfeld enhancement, allowing for larger DM masses.
While so far the bound-state formation was described via the emission of an on-shell mediator ($W^{\pm}$, $Z$, $H$, $g$, photon or exotic), we point out that this particular process does not have to be the dominant scattering-bound state conversion channel in general.

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