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We demonstrate that if the dark matter (DM) in the Universe contains multiplecomponents,the interactions between the DM components may induce DMconversions. It is then possible that the lightest DM component with anannihilation cross section much larger than that of the typical weaklyinteracting massive particle (WIMP) can obtain a relic density in consistentwith the cosmological observations, due to an enhancement from the DMconversion process at late time after the thermal decoupling. This provides analternative source of large boost factor required to explain the excessesreported by the recent DM indirect search experiments.

Enhancement of dark matter relic density from the late time dark matter conversions