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We explore the possibility that the annihilation of dark matter (DM) isboosted due to enhanced substructure in the presence of primordial black holes(PBHs) which constitute a sub-component of DM. The PBHs can generate entropyfluctuations at the small scales which trigger early structure formation, and alarge fraction of the whole DM can reside in these collapsed objects thatformed at high redshift ($z\gtrsim 100$). Such early forming minihalosconsequently possess higher densities than those in the conventional scenarios(without PBHs) and would be more resilient to tidal disruptions. Our scenariosof the annihilation boost due to DM substructures are of particular interestfor light ($< 1$ GeV) DM which has been less explored compared to heavier DM inthe presence of the PBHs.

Boosting small-scale structure via primordial black holes and implications for sub-GeV dark matter annihilation