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.In the dark age of the Universe, any exotic sources, e.g. the dark matter annihilation, which inject the energy into the intergalactic medium (IGM) will left some imprint on the 21cm background signal. Recently, one new kind of dark matter structure named ultracompact dark matter minihalos (UCMHs) was proposed. Near the inner part of UCMHs, the distribution of dark matter particles is steeper than that of the general dark matter halos, $\rho_{UCMHs}(r) \sim r^{-2.25}$ρUCMHs(r)∼r-2.25, and the formation time of UCMHs is earlier, $z_{c} \sim 1000$zc∼1000. Therefore, it is excepted that the dark matter annihilation within UCMHs can effect the 21cm background signal. In this paper, we investigated the contributions of the dark matter annihilation within UCMHs to the 21cm background signal.

Contributions of dark matter annihilation within ultracompact minihalos to the 21 cm background signal