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Stable dark matter particles may arise as pseudo-Goldstone bosons from theconfinement of dark quarks interacting via a non-Abelian gauge force. Theirrelic abundance is determined not by annihilations into visible particles butby dark pion number-changing processes within the dark sector, such as $3 \pi_D\to 2 \pi_D$. However, if the dark vector mesons $\rho_D$ are light enough for$3 \pi_D \to \pi_D \rho_D$ annihilations to be kinematically allowed, thisprocess dominates and significantly delays freeze-out. As a result, thepreferred dark matter mass scale increases and bounds from the Bullet Clustercan be evaded.

Dark matter relic density in strongly interacting dark sectors with light vector mesons