A QCD-like dark sector with a theta vacuum and a dark photon portal can simultaneously reproduce the dark matter relic abundance and produce the sharply velocity-dependent self-interactions inferred from small-scale structure.
Bouncing Dark Matter
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abstract
We present a novel mechanism for thermal dark matter production, characterized by a "bounce": the dark matter equilibrium distribution transitions from the canonical exponentially falling abundance to an exponentially rising one, resulting in an enhancement of the freezeout abundance by many orders of magnitude. We discuss several realizations of bouncing dark matter. The bounce allows the present day dark matter annihilation cross section to be significantly larger than the canonical thermal target, improving the prospects for indirect detection signals.
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Pion dark matter in a $\theta$ vacuum: a thermal relic with sharp velocity-dependent self-interactions
A QCD-like dark sector with a theta vacuum and a dark photon portal can simultaneously reproduce the dark matter relic abundance and produce the sharply velocity-dependent self-interactions inferred from small-scale structure.