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

TL;DR

This paper explores neutrino signals from ultracompact minihalos (UCMHs) to constrain primordial curvature perturbations, providing a novel approach complementing gamma-ray studies and linking dark matter annihilation signals to early universe conditions.

Contribution

It introduces the analysis of neutrino signals from UCMHs for the first time to constrain small-scale primordial curvature perturbations.

Findings

No excess neutrino signals detected from UCMHs.

Constraints on UCMH abundance are derived.

Limits on small-scale primordial curvature perturbations are established.

Abstract

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. So constraints on the abundance of UCMHs can be used to give a limit on the perturbations on these scales. In previous works in the literature, the authors focused on the {\gamma}-ray signals from UCMHs due to dark matter annihilation. In this work, we investigate the neutrino signals from nearby UCMHs. Although no excess of neutrino signals the dark matter annihilation has been observed, the constraints on the abundance of UCMHs can be obtained and these constraints can be translated into the limit on the primordial curvature perturbations on small scales.