Contributions of dark matter annihilation within ultracompact minihalos to the 21 cm background signal
Collage of Physics and Electrical Engineering, Anyang Normal University, 455000, Anyang, China
2 Joint Center for Particle, Nuclear Physics and Cosmology, 210093, Nanjing, China
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Accepted: 21 November 2016
Published online: 16 December 2016
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, , and the formation time of UCMHs is earlier, . 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.
© Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg, 2016