Neutrino signals from ultracompact minihalos and constraints on the primordial curvature perturbation

Understand

Compared with that of standard dark matter halos, the density profile of the recently proposed new kind of dark matter structure named ultracompact minihalos (UCMHs) is steeper and its formation time is earlier.

• If the dark matter is composed of weakly interactive massive particles (WIMP), the potential signals, e.g.
• neutrinos, from UCMHs due to the dark matter annihilation would be detected by IceCube/DeepCore or other detectors and such signals would have a very useful complementarity of gamma rays observations.
• On the other hand, the formation of UCMHs is related to primordial curvature perturbations on the smaller scales.