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Ultracompact dark matter minihalos (UCMHs) would be formed during the earlieruniverse if there were large density perturbations. If the dark matter candecay into the standard model particles, such as neutrinos, these objects wouldbecome the potential astrophysical sources and could be detected by the relatedinstruments, such as IceCube. In this paper, we investigate the neutrinosignals from the nearby UCMHs due to the gravitino dark matter decay andcompare these signals with the background neutrino flux which is mainly fromthe atmosphere to get the constraints on the abundance of UCMHs.

Constraints on the ultracompact minihalos using neutrino signals from the gravitino dark matter decay